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a better understanding of the pathophysiology of low back pain is necessary to ensure appropriate care for this potentially disabling disease&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Despite its frequency&#44; LBP&#39;s diagnosis remains sometimes difficult and mainly based on the elimination of other spinal diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">5</span></a> LBP pathophysiology is&#44; up to now&#44; unclear&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">There are controversial results regarding the role of pro-inflammatory cytokines such as interleukin &#40;IL-&#41;6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and Tumor necrosis factor &#40;TNF&#945;&#41; in the physiopathology of non-specific LBP<a class="elsevierStyleCrossRefs" href="#bib0175"><span class="elsevierStyleSup">5&#44;6</span></a> and its recurrence&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">7</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Besides&#44; several studies showed that pro-inflammatory cytokines contribute to the pathogenesis of IDD and associated pain mechanisms&#46;<a class="elsevierStyleCrossRefs" href="#bib0190"><span class="elsevierStyleSup">8&#44;9</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">This study aimed to compare the value of these pro-inflammatory cytokines between patients with non-specific LBP and pain-free controls&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Material and methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Patients</span><p id="par0040" class="elsevierStylePara elsevierViewall">We conducted a case&#8211;control study from September 2019 to December 2020 including 106 participants&#58;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">-</span><p id="par0045" class="elsevierStylePara elsevierViewall">G1&#58; 46 consecutive patients with non-specific LBP recruited from the outpatient clinic of the rheumatology department&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">-</span><p id="par0050" class="elsevierStylePara elsevierViewall">G0&#58; 60 pain-free controls recruited from different departments in the Military hospital of Tunis&#46;</p></li></ul></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Inclusion criteria</span><p id="par0055" class="elsevierStylePara elsevierViewall">Were included in this study patients with chronic non-specific LBP lasting<span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>3 months&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Only patients with magnetic resonance imaging &#40;MRI&#41; showing single LDH or IDD were included in the study&#46; The interpretation of MRIs was performed by a trained radiologist&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Exclusion criteria</span><p id="par0065" class="elsevierStylePara elsevierViewall">Non-inclusions criteria for the two groups were&#58; history of neoplasia&#44; asthma&#44; infections&#44; chronic inflammatory bowel disease&#44; psoriasis&#44; auto-immune disease &#40;rheumatoid arthritis&#44; systemic lupus erythematosus&#41;&#44; or steroids treatment&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Patients with LBP treated with surgery were not included&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Were excluded patients with LBP due to spondyloarthritis&#44; infectious spondylodiscitis&#44; or metastasis&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Clinical assessment</span><p id="par0080" class="elsevierStylePara elsevierViewall">We collected demographic and clinical data&#44; including age&#44; gender&#44; age at disease onset&#44; LBP duration&#44; radicular pain&#44; and therapeutic management&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">The pain degree was assessed using the Visual Analogic Scale &#40;VAS&#41;&#46; The VAS varied from &#8220;no pain&#8221; to &#8220;worst imaginable pain&#8221; &#40;0&#8211;100<span class="elsevierStyleHsp" style=""></span>mm&#41;&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">Lumbar spine mobility was evaluated using Schober&#39;s test&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">10</span></a> A restricted lumbar motion was defined as a difference between the measurements in erect and flexion positions lower than 5<span class="elsevierStyleHsp" style=""></span>cm&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Cytokine&#39;s measurement</span><p id="par0095" class="elsevierStylePara elsevierViewall">The IL-6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and &#40;TNF&#945;&#41; were measured&#46; The blood samples were collected&#44; centrifuged&#44; and frozen at &#8722;80<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; IL-6&#44; IL-8&#44; and TNF&#945; were measured using the chemiluminescence method&#44; whereas IL-17&#44; IL-22&#44; and IL-23 levels were measured using the ELISA &#40;Enzyme-linked Immunosorbent Assay&#41;&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Statistical analysis</span><p id="par0100" class="elsevierStylePara elsevierViewall">Statistical analysis was performed using the Statistical Package for Social Sciences &#40;SPSS&#41; software version 25&#46; We used descriptive statistics to identify the characteristics of the study population&#46; Results were expressed as the mean<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard deviation &#40;SD&#41;&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">Continuous variables were compared using <span class="elsevierStyleItalic">t</span>-tests for normally distributed variables and the Mann&#8211;Whitney <span class="elsevierStyleItalic">U</span> test for non-normally distributed groups&#46; Correlations were tested using the Pearson or Spearman correlation test&#44; depending on data distribution&#46; <span class="elsevierStyleItalic">p</span>-Value<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;05 was considered statistically significant&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">To assess the normality of data&#44; we used the Kolmogorov&#8211;Smirnov test&#46; Receiver operating characteristic &#40;ROC&#41; curves were used for each cytokine to evaluate their ability to discriminate patients with non-specific LBP from pain-free controls&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Ethical consideration</span><p id="par0115" class="elsevierStylePara elsevierViewall">This study was approved by eight members of the ethics committee of the hospital in May 2019&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">All participants were requested to read and sign an informed consent form explaining the aim and process of the study&#46;</p></span></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Result</span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Clinical and epidemiological characteristics of patients</span><p id="par0125" class="elsevierStylePara elsevierViewall">All patients were Caucasian&#46; There were 36 men in G1 and 46 in G0&#46; The mean age was 43&#46;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;7 years in G1 and 39&#46;56<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&#46;95 years in G0&#46; The mean body mass index &#40;BMI&#41; was 27&#46;31<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;47<span class="elsevierStyleHsp" style=""></span>kg&#47;m<span class="elsevierStyleSup">2</span>&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">Clinical characteristics of patients with non-specific LBP are summarized in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0135" class="elsevierStylePara elsevierViewall">The mean age at the onset of LBP was 38&#46;43<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&#46;75 years&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">The mean duration of LBP was 4&#46;72<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;03 years&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">Radicular pain was found in 37 cases with a VAS of 3&#46;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;5<span class="elsevierStyleHsp" style=""></span>mm&#46; The magnetic resonance imaging was performed for all patients &#40;G1&#41;&#44; showing LDH and IDD in 54&#46;3&#37; &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>25&#41; and 45&#46;7&#37; of cases &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&#44; respectively&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Spine limitation was found in 15 cases&#46;</p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Comparison of cytokines</span><p id="par0155" class="elsevierStylePara elsevierViewall">The IL-8 was higher in G1 &#40;18&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#46;64 versus 4&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;23<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;033&#41;&#46; There was no significant difference between the two groups regarding the other cytokines&#46; There were no differences between patients with LDH or IDD regarding IL-8 &#40;23&#46;91<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>62&#46;64 versus 14&#46;95<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#46;64<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;29&#41; and TNF&#945; &#40;19&#46;8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>46&#46;7 versus 7&#46;2<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;3<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;75&#41;&#46;</p><p id="par0160" class="elsevierStylePara elsevierViewall">IL-17 was higher in patients with restricted lumbar spine mobility &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Correlations between clinical parameters and cytokines</span><p id="par0165" class="elsevierStylePara elsevierViewall">As shown in <a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#44; a correlation was found between&#58; IL-8 and TNF&#945; &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;942&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span>&#41;&#44; IL-8 and IL-6 &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;490&#44; <span class="elsevierStyleItalic">p</span>&#58; 0&#46;011&#41;&#44; and IL-17 and IL-6 &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;945&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span>&#41;&#46; IL-8 levels correlated also with VAS<span class="elsevierStyleInf">Radicular-pain</span> &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;297&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;047&#41;&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Discriminative value of pro-inflammatory cytokines between patients with LBP and pain-free controls</span><p id="par0170" class="elsevierStylePara elsevierViewall">The IL-8 could differentiate patients in G1 from G0 with a cutoff of 4&#46;5<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#46; The area under the curve was good &#40;0&#46;917&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; The sensitivity and specificity were 91&#46;3&#37; and 90&#37;&#44; respectively&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Discussion</span><p id="par0175" class="elsevierStylePara elsevierViewall">We attempted to study pro-inflammatory cytokines&#44; including IL-6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and TNF&#945;&#44; in patients with chronic LBP&#46; We found that IL-8 was higher in patients with non-specific LBP&#44; and it was able to differentiate patients with LBP from pain-free controls with a cutoff of 4&#46;5<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#46;</p><p id="par0180" class="elsevierStylePara elsevierViewall">Several studies have analyzed the role of cytokines in LBP&#44; with variable results but with a predominance of pro-inflammatory cytokines&#44; indicating the role of inflammatory process in causing disk damage&#46;</p><p id="par0185" class="elsevierStylePara elsevierViewall">In a study including 127 patients with lumbar radicular pain due to LDH&#44; the authors demonstrated that chronic pain patients had increased serum levels of IL-8 at 6 weeks and 12 months after LDH&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">11</span></a> These findings suggest that IL-8 may contribute to the development of chronic pain after LDH&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">11</span></a> Moreover&#44; it has been proven in animal models that IL-8 was implicated in the pathophysiology of neuropathic pain&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">12</span></a></p><p id="par0190" class="elsevierStylePara elsevierViewall">Likewise&#44; Wang et al&#46; demonstrated that IL-8 and TNF&#945; levels were higher in patients with LBP and sciatica than healthy controls&#46; They also found that TNF&#945; correlated with Oswestry Disability Index &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;629&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;001&#41;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">13</span></a> which is a patient reported outcomes questionnaire used to assess functional disability in back pain patients&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">14</span></a></p><p id="par0195" class="elsevierStylePara elsevierViewall">This finding suggests that pro-inflammatory cytokines contribute to the generation and persistence of pain&#46;</p><p id="par0200" class="elsevierStylePara elsevierViewall">In a study including 155 women with acute LBP&#44; an association was found between TNF&#945; elevation and pain severity&#46; TNF&#945; was also associated with disability&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">15</span></a></p><p id="par0205" class="elsevierStylePara elsevierViewall">In a longitudinal study including 120 patients with LBP matched to a healthy control group&#44; the TNF&#945; was positive in 57&#46;6&#37; LBP patients versus 12&#46;3&#37; of controls at the beginning of the study&#46; The TNF&#945; levels decreased after 10 days of multidisciplinary therapy&#44; then remained constantly high in LBP patients&#46; Nevertheless&#44; no significant correlation was found between TNF&#945; levels and pain&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">16</span></a></p><p id="par0210" class="elsevierStylePara elsevierViewall">Krock et al&#46; found that IL-8 levels in the spinal fluid were higher in patients with chronic LBP due to IDD than those with IDD without pain&#46; The authors highlighted the effect of blocking IL-8 receptor signaling on reducing LBP behaviors and disk inflammation in a mouse model&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">17</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall">Karppinen et al&#46; assessed the serum biomarkers in chronic LBP patients with lumbar Modic change&#46; They found that IL-8 and TNF&#945; were lower among these patients than pain-free controls&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">18</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall">Schroeder et al&#46; showed that TNF&#945; was higher in patients with intervertebral discs with type II Modic changes&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">19</span></a></p><p id="par0225" class="elsevierStylePara elsevierViewall">These findings suggest the possible pathophysiological role of IL-8 and TNF&#945; in LBP and radicular pain due to IDD or LDH&#46; However&#44; their role in LBP related to vertebral bone marrow lesions such as Modic change remains unclear and needs to be more closely assessed&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">19</span></a></p><p id="par0230" class="elsevierStylePara elsevierViewall">In our study&#44; a strong correlation was found between IL-8 and TNF&#945;&#46; This correlation &#40;IL-8&#47;TNF&#945; <span class="elsevierStyleItalic">r</span>&#58;0&#46;35&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;003&#41; was also noted in the study of Licciardone et al&#46;&#44; highlighting the link between pro-inflammatory cytokines in non-specific LBP&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">20</span></a></p><p id="par0235" class="elsevierStylePara elsevierViewall">Zhang Y et al&#46; demonstrated that intervertebral disk cells could produce IL-1&#44; IL-7&#44; and IL-8&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">21</span></a> They suggested that these cytokines mediate discogenic pain by stimulating nerve endings in intervertebral disk and contribute to the persistence of this pain by diffusing these cytokines to nearby tissues&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">21</span></a></p><p id="par0240" class="elsevierStylePara elsevierViewall">IL-8 can also promote angiogenesis and attract neutrophils in pathological sites&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">22</span></a></p><p id="par0245" class="elsevierStylePara elsevierViewall">Besides&#44; IL-8 can promote microglial activation in the lumbar disk herniation rate model&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">23</span></a> Chronic pain maintenance can be explained by delayed IL-8 upregulation in the spinal cord and the dorsal root ganglion&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">23</span></a></p><p id="par0250" class="elsevierStylePara elsevierViewall">These findings suggest that IL-8 inhibition may be a potential therapy for chronic low back pain&#46;</p><p id="par0255" class="elsevierStylePara elsevierViewall">Several studies emphasize the role of IL-17 in the pathophysiology of IDD and demonstrate that IL-17 is an important regulator of inflammation in disk diseases&#46;<a class="elsevierStyleCrossRefs" href="#bib0270"><span class="elsevierStyleSup">24&#44;25</span></a></p><p id="par0260" class="elsevierStylePara elsevierViewall">Besides&#44; IL-17 may contribute to the pain genesis in patients with LBP&#46; Cheng et al&#46; found that VAS pain score was positively correlated with IL-17 concentration &#40;<span class="elsevierStyleItalic">r</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;458&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;007&#41; in patients with LBP&#46; IL-17 levels were also higher in patients with ruptured lumbar disk &#40;12&#46;13<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;62<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#41; than those with non-ruptured lumbar discs &#40;5&#46;06<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;78<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;003&#41; and healthy controls &#40;1&#46;31<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;77<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">8</span></a></p><p id="par0265" class="elsevierStylePara elsevierViewall">In our study&#44; IL-17 was significantly higher in patients with spine limitations&#46;</p><p id="par0270" class="elsevierStylePara elsevierViewall">A correlation was found between IL-6 and both IL-8 and IL-17&#46; In a study assessing IL-6 expression in paravertebral muscle&#44; annulus fibrosus&#44; and nucleus pulposus biopsies&#44; the IL-6 was found in all lumbar disk hernias biopsies but not in controls&#46; This result suggests that the lumbar disk hernia is associated with a local inflammatory process&#46; Nevertheless&#44; there was no correlation between IL-6 expression and VAS scores&#46;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">26</span></a></p><p id="par0275" class="elsevierStylePara elsevierViewall">Notably&#44; some authors highlighted that elevated pro-inflammatory cytokines levels in LBP were due to adipocytes stimulation in overweight and obese patients&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">27</span></a> In our study there was no correlation between cytokines levels and BMI&#46; Pro-inflammatory cytokines like IL-6&#44; IL-8 and TNF&#945; correlated to BMI in subjects without LBP&#46;<a class="elsevierStyleCrossRefs" href="#bib0290"><span class="elsevierStyleSup">28&#8211;30</span></a> To our knowledge&#44; the correlation between pro-inflammatory cytokines was not assessed in LBP patients&#46;</p><p id="par0280" class="elsevierStylePara elsevierViewall">To our knowledge&#44; this study is the first to determine an IL-8 threshold to distinguish LBP patients from healthy controls&#46; The results of our study are encouraging&#46; However&#44; some limitations must be considered&#44; notably the small number of patients with LBP&#46;</p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0140">Conclusion</span><p id="par0285" class="elsevierStylePara elsevierViewall">IL-8 seemed to be the most important pro-inflammatory cytokine in patients with disk-disease&#44; as it was significantly higher in patients with LBP&#46;</p><p id="par0290" class="elsevierStylePara elsevierViewall">IL-8 correlated with VAS&#44; highlighting the role of this cytokine in the development of chronic pain in patients with disk disease&#46;</p><p id="par0295" class="elsevierStylePara elsevierViewall">TNF&#945; concentrations correlated with IL-8 and IL-17 levels were higher in patients with restricted lumbar pain&#44; suggesting that these cytokines might play a role in the pathophysiology of disk disease&#46; These findings could potentially be used by future studies to develop new LBP therapeutic strategies&#46;</p></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0145">Authors&#8217; contributions</span><p id="par0300" class="elsevierStylePara elsevierViewall"><ul class="elsevierStyleList" id="lis0010"><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">-</span><p id="par0305" class="elsevierStylePara elsevierViewall">Dr&#46; Maroua SLOUMA&#58; Methodology and Writing &#8211; review &#38; editing</p></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">-</span><p id="par0310" class="elsevierStylePara elsevierViewall">Dr&#46; Lobna KHARRAT&#58; Roles&#47;Writing &#8211; original draft</p></li><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">-</span><p id="par0315" class="elsevierStylePara elsevierViewall">Dr&#46; Aymen TEZEGDENTI&#58; data curation and funding acquisition</p></li><li class="elsevierStyleListItem" id="lsti0030"><span class="elsevierStyleLabel">-</span><p id="par0320" class="elsevierStylePara elsevierViewall">Dr&#46; Rim DHAHRI&#58; formal analysis</p></li><li class="elsevierStyleListItem" id="lsti0035"><span class="elsevierStyleLabel">-</span><p id="par0325" class="elsevierStylePara elsevierViewall">Dr Ezzeddine GHAZOUANI&#58; project administration</p></li><li class="elsevierStyleListItem" id="lsti0040"><span class="elsevierStyleLabel">-</span><p id="par0330" class="elsevierStylePara elsevierViewall">Dr&#46; Leila METOUI&#58; conceptualisation</p></li><li class="elsevierStyleListItem" id="lsti0045"><span class="elsevierStyleLabel">-</span><p id="par0335" class="elsevierStylePara elsevierViewall">Dr&#46; Imen GHARSALLAH&#58; visualization</p></li><li class="elsevierStyleListItem" id="lsti0050"><span class="elsevierStyleLabel">-</span><p id="par0340" class="elsevierStylePara elsevierViewall">Dr&#46; Bassem LOUZIR&#58; visualization and validation</p></li></ul></p></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0150">Availability of data and material</span><p id="par0345" class="elsevierStylePara elsevierViewall">The datasets used and&#47;or analyzed during the current study are available from the corresponding author on reasonable request&#46;</p></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0155">Code availability &#40;software application or custom code&#41;</span><p id="par0350" class="elsevierStylePara elsevierViewall">Not applicable&#46;</p></span><span id="sec0100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0160">Ethics approval</span><p id="par0355" class="elsevierStylePara elsevierViewall">This study was approved by the ethics committee of the Hospital&#46;</p></span><span id="sec0105" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0165">Consent to participate</span><p id="par0360" class="elsevierStylePara elsevierViewall">A consent has been signed by each patient&#46;</p></span><span id="sec0110" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0170">Funding</span><p id="par0365" class="elsevierStylePara elsevierViewall">The authors declare that they have no funding for the research&#46;</p></span><span id="sec0115" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0175">Conflict of interest</span><p id="par0370" class="elsevierStylePara elsevierViewall">None&#46;</p></span></span>"
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              "titulo" => "Discriminative value of pro-inflammatory cytokines between patients with LBP and pain-free controls"
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          "titulo" => "Discussion"
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          "titulo" => "Availability of data and material"
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          "titulo" => "Ethics approval"
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          "identificador" => "sec0115"
          "titulo" => "Conflict of interest"
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        16 => array:2 [
          "identificador" => "xack665188"
          "titulo" => "Acknowledgements"
        ]
        17 => array:1 [
          "titulo" => "References"
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    ]
    "pdfFichero" => "main.pdf"
    "tienePdf" => true
    "fechaRecibido" => "2022-03-29"
    "fechaAceptado" => "2022-07-21"
    "PalabrasClave" => array:2 [
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        0 => array:4 [
          "clase" => "keyword"
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          "palabras" => array:6 [
            0 => "Back pain"
            1 => "Disk herniation"
            2 => "Cytokine"
            3 => "Interleukin-8"
            4 => "Tumor necrosis factor &#945;"
            5 => "Interleukin-17"
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          "identificador" => "xpalclavsec1638523"
          "palabras" => array:6 [
            0 => "Dolor de espalda"
            1 => "Hernia discal"
            2 => "Citoquina"
            3 => "Interleucina 8"
            4 => "Factor de necrosis tumoral &#945;"
            5 => "Interleucina 17"
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    "resumen" => array:2 [
      "en" => array:3 [
        "titulo" => "Abstract"
        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction and objectives</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">There are controversial results regarding the value of serum IL-8 and TNF&#945; in patients with non-specific low back pain&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">This study aimed to compare pro-inflammatory cytokines between patients with non-specific back pain and pain-free controls&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Materials and methods</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">We conducted a case&#8211;control study including 106 participants&#58; 46 patients with chronic non-specific low back pain &#40;G1&#41; and 60 pain-free controls &#40;G0&#41;&#46; The interleukin &#40;IL-&#41;6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and Tumor necrosis factor &#945; &#40;TNF&#945;&#41; were measured&#46; We collected demographic and clinical data&#44; including age&#44; gender&#44; low back pain duration and radicular pain&#46; The pain degree was assessed using the Visual Analogic Scale&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">The mean age was 43&#46;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;7 years in G1&#46; Radicular pain was found in 37 cases with a Visual Analogic Scale of 3&#46;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;5<span class="elsevierStyleHsp" style=""></span>mm&#46; The magnetic resonance imaging was performed in &#40;G1&#41;&#44; showing disk herniation and degenerative disk disease in 54&#46;3&#37; &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>25&#41; and 45&#46;7&#37; of cases &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&#44; respectively&#46; The IL-8 was higher in G1 &#40;18&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#46;64 versus 4&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;23<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;033&#41;&#46; IL-8 levels correlated with TNF&#945; &#40;0&#46;942&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10&#8211;3&#41;&#44; IL-6 &#40;0&#46;490&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;011&#41; and Visual Analogic Scale<span class="elsevierStyleInf">Radicular-pain</span> &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;297&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;047&#41;&#46;</p><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">IL-17 was higher in patients with restricted lumbar spine mobility &#40;9&#46;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#46;77 versus 1&#46;19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;54<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;014&#41;&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Our results provide evidence that IL-8 and TNF&#945; play a role in low back pain and radicular pain due to disk degeneration or herniation&#46; These findings could potentially be used by future studies to develop new non-specific low back pain therapeutic strategies&#46;</p></span>"
        "secciones" => array:4 [
          0 => array:2 [
            "identificador" => "abst0005"
            "titulo" => "Introduction and objectives"
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          1 => array:2 [
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            "titulo" => "Materials and methods"
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            "identificador" => "abst0015"
            "titulo" => "Results"
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            "titulo" => "Conclusions"
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        "titulo" => "Resumen"
        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introducci&#243;n y objetivos</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Existen resultados controvertidos en cuanto al valor de la interleucina &#40;IL&#41; 8 y el factor de necrosis tumoral &#945; &#40;TNF&#945;&#41; s&#233;ricos en pacientes con lumbalgia inespec&#237;fica&#46;</p><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Este estudio tuvo como objetivo comparar las citoquinas proinflamatorias entre pacientes con dolor de espalda inespec&#237;fico y controles sin dolor&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Materiales y m&#233;todos</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Realizamos un estudio de casos y controles que incluy&#243; a 106 participantes&#58; 46 pacientes con dolor lumbar cr&#243;nico inespec&#237;fico &#40;G1&#41; y 60 controles sin dolor &#40;G0&#41;&#46; Se midieron las IL-6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22 y el TNF&#945;&#46; Recopilamos datos demogr&#225;ficos y cl&#237;nicos&#44; incluidos la edad&#44; el sexo&#44; la duraci&#243;n del dolor lumbar y el dolor radicular&#46; El grado de dolor se evalu&#243; mediante la escala anal&#243;gica visual&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">La edad media fue de 43&#44;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#44;7 a&#241;os en G1&#46; Se encontr&#243; dolor radicular en 37 casos con una escala anal&#243;gica visual de 3&#44;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#44;5<span class="elsevierStyleHsp" style=""></span>mm&#46; La resonancia magn&#233;tica se realiz&#243; en G1&#44; mostrando hernia discal y enfermedad discal degenerativa en el 54&#44;3&#37; &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>25&#41; y el 45&#44;7&#37; de los casos &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&#44; respectivamente&#46; La IL-8 fue mayor en G1 &#40;18&#44;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#44;64 versus 4&#44;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#44;23<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;033&#41;&#46; Los niveles de IL-8 se correlacionaron con TNF&#945; &#40;0&#44;942&#44; p<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span>&#41;&#44; IL-6 &#40;0&#44;490&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;011&#41; y escala visual anal&#243;gica<span class="elsevierStyleInf">dolor radicular</span> &#40;r<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;297&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;047&#41;&#46;</p><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">IL-17 fue mayor en pacientes con movilidad restringida de la columna lumbar &#40;9&#44;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#44;77 versus 1&#44;19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#44;54<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;014&#41;&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">Nuestros resultados proporcionan evidencia de que la IL-8 y el TNF&#945; juegan un papel en el dolor lumbar y en el dolor radicular debido a la degeneraci&#243;n o a hernia discal&#46; Estos hallazgos podr&#237;an potencialmente ser utilizados por estudios futuros para desarrollar nuevas estrategias terap&#233;uticas no espec&#237;ficas para el dolor lumbar&#46;</p></span>"
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            "titulo" => "Resultados"
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          "en" => "<p id="spar0065" class="elsevierStyleSimplePara elsevierViewall">Receiver operating characteristic curve &#40;ROC&#41; showing the discriminative value of IL-8 between LBP and pain-free controls&#46;</p>"
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          "leyenda" => "<p id="spar0075" class="elsevierStyleSimplePara elsevierViewall">LBP&#58; low back pain&#44; VAS&#58; Visual Analog Scale&#44; MRI&#58; magnetic resonance imaging&#46;</p>"
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>VAS<span class="elsevierStyleInf">radicular</span><span class="elsevierStyleInf">pain</span>&#44; mean<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>SD&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">21 &#40;45&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
                  """
              ]
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Normal&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Restricted&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">1&#46;09<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;28&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">1&#46;83<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;01&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7&#46;25<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;44&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;324&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">15&#46;45<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>38&#46;18&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">7&#46;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;33&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">IL-8&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">4&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;23&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">18&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#46;64&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">21&#46;27<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>53&#46;33&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">13&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>16&#46;5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;62&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">1&#46;10<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;53&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">3&#46;73<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>11&#46;79&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">0&#46;235&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1&#46;19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;54&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">9&#46;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#46;77&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">IL-22&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
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                  \t\t\t\t">13&#46;10<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>15&#46;27&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">14&#46;42<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;17&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">15&#46;42<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&#46;45&nbsp;\t\t\t\t\t\t\n
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Original article
Pro-inflammatory cytokines in patients with low back pain: A comparative study
Citoquinas proinflamatorias en pacientes con dolor lumbar: un estudio comparativo
Maroua Sloumaa,c, Lobna Kharrata,c,
Corresponding author
kharratlobna1992@gmail.com

Corresponding author.
, Aymen Tezegdentib,c, Leila Metouia,c, Ezzeddine Ghazouanib,c, Rim Dhahria,c, Imen Gharsallaha,c, Bassem Louzirc,d
a Department of Rheumatology, Military Hospital, Tunis, Tunisia
b Department of Immunology, Military Hospital, Tunis, Tunisia
c Tunis El Manar University, Tunisia
d Department of Internal Medicine, Military Hospital, Tunis, Tunisia
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    "textoCompleto" => "<span class="elsevierStyleSections"><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0065">Introduction</span><p id="par0005" class="elsevierStylePara elsevierViewall">Low back pain &#40;LBP&#41; is a global healthcare concern&#46; Non-specific LBP is the most common form&#46;<a class="elsevierStyleCrossRef" href="#bib0155"><span class="elsevierStyleSup">1</span></a> It can be due to several diseases&#44; such as disk disease &#40;intervertebral disk degeneration &#40;IDD&#41; or lumbar disk herniation &#40;LDH&#41;&#41;&#44; facet joint osteoarthritis&#44; and spinal stenosis&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">2</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Non-specific LBP is a very common disease that affects 70 to 90&#37; of general population&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">3</span></a> Fifteen per cent of work absenteeism is caused by LBP&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">3</span></a> It can be responsible for disability and restricted lumbar range of motion&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">4</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Thus&#44; a better understanding of the pathophysiology of low back pain is necessary to ensure appropriate care for this potentially disabling disease&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Despite its frequency&#44; LBP&#39;s diagnosis remains sometimes difficult and mainly based on the elimination of other spinal diseases&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">5</span></a> LBP pathophysiology is&#44; up to now&#44; unclear&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">There are controversial results regarding the role of pro-inflammatory cytokines such as interleukin &#40;IL-&#41;6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and Tumor necrosis factor &#40;TNF&#945;&#41; in the physiopathology of non-specific LBP<a class="elsevierStyleCrossRefs" href="#bib0175"><span class="elsevierStyleSup">5&#44;6</span></a> and its recurrence&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">7</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">Besides&#44; several studies showed that pro-inflammatory cytokines contribute to the pathogenesis of IDD and associated pain mechanisms&#46;<a class="elsevierStyleCrossRefs" href="#bib0190"><span class="elsevierStyleSup">8&#44;9</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">This study aimed to compare the value of these pro-inflammatory cytokines between patients with non-specific LBP and pain-free controls&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0070">Material and methods</span><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0075">Patients</span><p id="par0040" class="elsevierStylePara elsevierViewall">We conducted a case&#8211;control study from September 2019 to December 2020 including 106 participants&#58;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">-</span><p id="par0045" class="elsevierStylePara elsevierViewall">G1&#58; 46 consecutive patients with non-specific LBP recruited from the outpatient clinic of the rheumatology department&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">-</span><p id="par0050" class="elsevierStylePara elsevierViewall">G0&#58; 60 pain-free controls recruited from different departments in the Military hospital of Tunis&#46;</p></li></ul></p></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0080">Inclusion criteria</span><p id="par0055" class="elsevierStylePara elsevierViewall">Were included in this study patients with chronic non-specific LBP lasting<span class="elsevierStyleHsp" style=""></span>&#62;<span class="elsevierStyleHsp" style=""></span>3 months&#46;</p><p id="par0060" class="elsevierStylePara elsevierViewall">Only patients with magnetic resonance imaging &#40;MRI&#41; showing single LDH or IDD were included in the study&#46; The interpretation of MRIs was performed by a trained radiologist&#46;</p></span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0085">Exclusion criteria</span><p id="par0065" class="elsevierStylePara elsevierViewall">Non-inclusions criteria for the two groups were&#58; history of neoplasia&#44; asthma&#44; infections&#44; chronic inflammatory bowel disease&#44; psoriasis&#44; auto-immune disease &#40;rheumatoid arthritis&#44; systemic lupus erythematosus&#41;&#44; or steroids treatment&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Patients with LBP treated with surgery were not included&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Were excluded patients with LBP due to spondyloarthritis&#44; infectious spondylodiscitis&#44; or metastasis&#46;</p></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0090">Clinical assessment</span><p id="par0080" class="elsevierStylePara elsevierViewall">We collected demographic and clinical data&#44; including age&#44; gender&#44; age at disease onset&#44; LBP duration&#44; radicular pain&#44; and therapeutic management&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">The pain degree was assessed using the Visual Analogic Scale &#40;VAS&#41;&#46; The VAS varied from &#8220;no pain&#8221; to &#8220;worst imaginable pain&#8221; &#40;0&#8211;100<span class="elsevierStyleHsp" style=""></span>mm&#41;&#46;</p><p id="par0090" class="elsevierStylePara elsevierViewall">Lumbar spine mobility was evaluated using Schober&#39;s test&#46;<a class="elsevierStyleCrossRef" href="#bib0200"><span class="elsevierStyleSup">10</span></a> A restricted lumbar motion was defined as a difference between the measurements in erect and flexion positions lower than 5<span class="elsevierStyleHsp" style=""></span>cm&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0095">Cytokine&#39;s measurement</span><p id="par0095" class="elsevierStylePara elsevierViewall">The IL-6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and &#40;TNF&#945;&#41; were measured&#46; The blood samples were collected&#44; centrifuged&#44; and frozen at &#8722;80<span class="elsevierStyleHsp" style=""></span>&#176;C&#46; IL-6&#44; IL-8&#44; and TNF&#945; were measured using the chemiluminescence method&#44; whereas IL-17&#44; IL-22&#44; and IL-23 levels were measured using the ELISA &#40;Enzyme-linked Immunosorbent Assay&#41;&#46;</p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0100">Statistical analysis</span><p id="par0100" class="elsevierStylePara elsevierViewall">Statistical analysis was performed using the Statistical Package for Social Sciences &#40;SPSS&#41; software version 25&#46; We used descriptive statistics to identify the characteristics of the study population&#46; Results were expressed as the mean<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>standard deviation &#40;SD&#41;&#46;</p><p id="par0105" class="elsevierStylePara elsevierViewall">Continuous variables were compared using <span class="elsevierStyleItalic">t</span>-tests for normally distributed variables and the Mann&#8211;Whitney <span class="elsevierStyleItalic">U</span> test for non-normally distributed groups&#46; Correlations were tested using the Pearson or Spearman correlation test&#44; depending on data distribution&#46; <span class="elsevierStyleItalic">p</span>-Value<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;05 was considered statistically significant&#46;</p><p id="par0110" class="elsevierStylePara elsevierViewall">To assess the normality of data&#44; we used the Kolmogorov&#8211;Smirnov test&#46; Receiver operating characteristic &#40;ROC&#41; curves were used for each cytokine to evaluate their ability to discriminate patients with non-specific LBP from pain-free controls&#46;</p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0105">Ethical consideration</span><p id="par0115" class="elsevierStylePara elsevierViewall">This study was approved by eight members of the ethics committee of the hospital in May 2019&#46;</p><p id="par0120" class="elsevierStylePara elsevierViewall">All participants were requested to read and sign an informed consent form explaining the aim and process of the study&#46;</p></span></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0110">Result</span><span id="sec0055" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0115">Clinical and epidemiological characteristics of patients</span><p id="par0125" class="elsevierStylePara elsevierViewall">All patients were Caucasian&#46; There were 36 men in G1 and 46 in G0&#46; The mean age was 43&#46;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;7 years in G1 and 39&#46;56<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&#46;95 years in G0&#46; The mean body mass index &#40;BMI&#41; was 27&#46;31<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;47<span class="elsevierStyleHsp" style=""></span>kg&#47;m<span class="elsevierStyleSup">2</span>&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">Clinical characteristics of patients with non-specific LBP are summarized in <a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0135" class="elsevierStylePara elsevierViewall">The mean age at the onset of LBP was 38&#46;43<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&#46;75 years&#46;</p><p id="par0140" class="elsevierStylePara elsevierViewall">The mean duration of LBP was 4&#46;72<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;03 years&#46;</p><p id="par0145" class="elsevierStylePara elsevierViewall">Radicular pain was found in 37 cases with a VAS of 3&#46;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;5<span class="elsevierStyleHsp" style=""></span>mm&#46; The magnetic resonance imaging was performed for all patients &#40;G1&#41;&#44; showing LDH and IDD in 54&#46;3&#37; &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>25&#41; and 45&#46;7&#37; of cases &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&#44; respectively&#46;</p><p id="par0150" class="elsevierStylePara elsevierViewall">Spine limitation was found in 15 cases&#46;</p></span><span id="sec0060" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0120">Comparison of cytokines</span><p id="par0155" class="elsevierStylePara elsevierViewall">The IL-8 was higher in G1 &#40;18&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#46;64 versus 4&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;23<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;033&#41;&#46; There was no significant difference between the two groups regarding the other cytokines&#46; There were no differences between patients with LDH or IDD regarding IL-8 &#40;23&#46;91<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>62&#46;64 versus 14&#46;95<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#46;64<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;29&#41; and TNF&#945; &#40;19&#46;8<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>46&#46;7 versus 7&#46;2<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;3<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;75&#41;&#46;</p><p id="par0160" class="elsevierStylePara elsevierViewall">IL-17 was higher in patients with restricted lumbar spine mobility &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46;</p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span><span id="sec0065" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0125">Correlations between clinical parameters and cytokines</span><p id="par0165" class="elsevierStylePara elsevierViewall">As shown in <a class="elsevierStyleCrossRef" href="#tbl0015">Table 3</a>&#44; a correlation was found between&#58; IL-8 and TNF&#945; &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;942&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span>&#41;&#44; IL-8 and IL-6 &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;490&#44; <span class="elsevierStyleItalic">p</span>&#58; 0&#46;011&#41;&#44; and IL-17 and IL-6 &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;945&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span>&#41;&#46; IL-8 levels correlated also with VAS<span class="elsevierStyleInf">Radicular-pain</span> &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;297&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;047&#41;&#46;</p><elsevierMultimedia ident="tbl0015"></elsevierMultimedia></span><span id="sec0070" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0130">Discriminative value of pro-inflammatory cytokines between patients with LBP and pain-free controls</span><p id="par0170" class="elsevierStylePara elsevierViewall">The IL-8 could differentiate patients in G1 from G0 with a cutoff of 4&#46;5<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#46; The area under the curve was good &#40;0&#46;917&#41; &#40;<a class="elsevierStyleCrossRef" href="#fig0005">Fig&#46; 1</a>&#41;&#46; The sensitivity and specificity were 91&#46;3&#37; and 90&#37;&#44; respectively&#46;</p><elsevierMultimedia ident="fig0005"></elsevierMultimedia></span></span><span id="sec0075" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0135">Discussion</span><p id="par0175" class="elsevierStylePara elsevierViewall">We attempted to study pro-inflammatory cytokines&#44; including IL-6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and TNF&#945;&#44; in patients with chronic LBP&#46; We found that IL-8 was higher in patients with non-specific LBP&#44; and it was able to differentiate patients with LBP from pain-free controls with a cutoff of 4&#46;5<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#46;</p><p id="par0180" class="elsevierStylePara elsevierViewall">Several studies have analyzed the role of cytokines in LBP&#44; with variable results but with a predominance of pro-inflammatory cytokines&#44; indicating the role of inflammatory process in causing disk damage&#46;</p><p id="par0185" class="elsevierStylePara elsevierViewall">In a study including 127 patients with lumbar radicular pain due to LDH&#44; the authors demonstrated that chronic pain patients had increased serum levels of IL-8 at 6 weeks and 12 months after LDH&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">11</span></a> These findings suggest that IL-8 may contribute to the development of chronic pain after LDH&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">11</span></a> Moreover&#44; it has been proven in animal models that IL-8 was implicated in the pathophysiology of neuropathic pain&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">12</span></a></p><p id="par0190" class="elsevierStylePara elsevierViewall">Likewise&#44; Wang et al&#46; demonstrated that IL-8 and TNF&#945; levels were higher in patients with LBP and sciatica than healthy controls&#46; They also found that TNF&#945; correlated with Oswestry Disability Index &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;629&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;001&#41;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">13</span></a> which is a patient reported outcomes questionnaire used to assess functional disability in back pain patients&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">14</span></a></p><p id="par0195" class="elsevierStylePara elsevierViewall">This finding suggests that pro-inflammatory cytokines contribute to the generation and persistence of pain&#46;</p><p id="par0200" class="elsevierStylePara elsevierViewall">In a study including 155 women with acute LBP&#44; an association was found between TNF&#945; elevation and pain severity&#46; TNF&#945; was also associated with disability&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">15</span></a></p><p id="par0205" class="elsevierStylePara elsevierViewall">In a longitudinal study including 120 patients with LBP matched to a healthy control group&#44; the TNF&#945; was positive in 57&#46;6&#37; LBP patients versus 12&#46;3&#37; of controls at the beginning of the study&#46; The TNF&#945; levels decreased after 10 days of multidisciplinary therapy&#44; then remained constantly high in LBP patients&#46; Nevertheless&#44; no significant correlation was found between TNF&#945; levels and pain&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">16</span></a></p><p id="par0210" class="elsevierStylePara elsevierViewall">Krock et al&#46; found that IL-8 levels in the spinal fluid were higher in patients with chronic LBP due to IDD than those with IDD without pain&#46; The authors highlighted the effect of blocking IL-8 receptor signaling on reducing LBP behaviors and disk inflammation in a mouse model&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">17</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall">Karppinen et al&#46; assessed the serum biomarkers in chronic LBP patients with lumbar Modic change&#46; They found that IL-8 and TNF&#945; were lower among these patients than pain-free controls&#46;<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">18</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall">Schroeder et al&#46; showed that TNF&#945; was higher in patients with intervertebral discs with type II Modic changes&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">19</span></a></p><p id="par0225" class="elsevierStylePara elsevierViewall">These findings suggest the possible pathophysiological role of IL-8 and TNF&#945; in LBP and radicular pain due to IDD or LDH&#46; However&#44; their role in LBP related to vertebral bone marrow lesions such as Modic change remains unclear and needs to be more closely assessed&#46;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">19</span></a></p><p id="par0230" class="elsevierStylePara elsevierViewall">In our study&#44; a strong correlation was found between IL-8 and TNF&#945;&#46; This correlation &#40;IL-8&#47;TNF&#945; <span class="elsevierStyleItalic">r</span>&#58;0&#46;35&#59; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;003&#41; was also noted in the study of Licciardone et al&#46;&#44; highlighting the link between pro-inflammatory cytokines in non-specific LBP&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">20</span></a></p><p id="par0235" class="elsevierStylePara elsevierViewall">Zhang Y et al&#46; demonstrated that intervertebral disk cells could produce IL-1&#44; IL-7&#44; and IL-8&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">21</span></a> They suggested that these cytokines mediate discogenic pain by stimulating nerve endings in intervertebral disk and contribute to the persistence of this pain by diffusing these cytokines to nearby tissues&#46;<a class="elsevierStyleCrossRef" href="#bib0255"><span class="elsevierStyleSup">21</span></a></p><p id="par0240" class="elsevierStylePara elsevierViewall">IL-8 can also promote angiogenesis and attract neutrophils in pathological sites&#46;<a class="elsevierStyleCrossRef" href="#bib0260"><span class="elsevierStyleSup">22</span></a></p><p id="par0245" class="elsevierStylePara elsevierViewall">Besides&#44; IL-8 can promote microglial activation in the lumbar disk herniation rate model&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">23</span></a> Chronic pain maintenance can be explained by delayed IL-8 upregulation in the spinal cord and the dorsal root ganglion&#46;<a class="elsevierStyleCrossRef" href="#bib0265"><span class="elsevierStyleSup">23</span></a></p><p id="par0250" class="elsevierStylePara elsevierViewall">These findings suggest that IL-8 inhibition may be a potential therapy for chronic low back pain&#46;</p><p id="par0255" class="elsevierStylePara elsevierViewall">Several studies emphasize the role of IL-17 in the pathophysiology of IDD and demonstrate that IL-17 is an important regulator of inflammation in disk diseases&#46;<a class="elsevierStyleCrossRefs" href="#bib0270"><span class="elsevierStyleSup">24&#44;25</span></a></p><p id="par0260" class="elsevierStylePara elsevierViewall">Besides&#44; IL-17 may contribute to the pain genesis in patients with LBP&#46; Cheng et al&#46; found that VAS pain score was positively correlated with IL-17 concentration &#40;<span class="elsevierStyleItalic">r</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;458&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;007&#41; in patients with LBP&#46; IL-17 levels were also higher in patients with ruptured lumbar disk &#40;12&#46;13<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;62<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#41; than those with non-ruptured lumbar discs &#40;5&#46;06<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;78<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;003&#41; and healthy controls &#40;1&#46;31<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>0&#46;77<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>0&#46;001&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">8</span></a></p><p id="par0265" class="elsevierStylePara elsevierViewall">In our study&#44; IL-17 was significantly higher in patients with spine limitations&#46;</p><p id="par0270" class="elsevierStylePara elsevierViewall">A correlation was found between IL-6 and both IL-8 and IL-17&#46; In a study assessing IL-6 expression in paravertebral muscle&#44; annulus fibrosus&#44; and nucleus pulposus biopsies&#44; the IL-6 was found in all lumbar disk hernias biopsies but not in controls&#46; This result suggests that the lumbar disk hernia is associated with a local inflammatory process&#46; Nevertheless&#44; there was no correlation between IL-6 expression and VAS scores&#46;<a class="elsevierStyleCrossRef" href="#bib0280"><span class="elsevierStyleSup">26</span></a></p><p id="par0275" class="elsevierStylePara elsevierViewall">Notably&#44; some authors highlighted that elevated pro-inflammatory cytokines levels in LBP were due to adipocytes stimulation in overweight and obese patients&#46;<a class="elsevierStyleCrossRef" href="#bib0285"><span class="elsevierStyleSup">27</span></a> In our study there was no correlation between cytokines levels and BMI&#46; Pro-inflammatory cytokines like IL-6&#44; IL-8 and TNF&#945; correlated to BMI in subjects without LBP&#46;<a class="elsevierStyleCrossRefs" href="#bib0290"><span class="elsevierStyleSup">28&#8211;30</span></a> To our knowledge&#44; the correlation between pro-inflammatory cytokines was not assessed in LBP patients&#46;</p><p id="par0280" class="elsevierStylePara elsevierViewall">To our knowledge&#44; this study is the first to determine an IL-8 threshold to distinguish LBP patients from healthy controls&#46; The results of our study are encouraging&#46; However&#44; some limitations must be considered&#44; notably the small number of patients with LBP&#46;</p></span><span id="sec0080" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0140">Conclusion</span><p id="par0285" class="elsevierStylePara elsevierViewall">IL-8 seemed to be the most important pro-inflammatory cytokine in patients with disk-disease&#44; as it was significantly higher in patients with LBP&#46;</p><p id="par0290" class="elsevierStylePara elsevierViewall">IL-8 correlated with VAS&#44; highlighting the role of this cytokine in the development of chronic pain in patients with disk disease&#46;</p><p id="par0295" class="elsevierStylePara elsevierViewall">TNF&#945; concentrations correlated with IL-8 and IL-17 levels were higher in patients with restricted lumbar pain&#44; suggesting that these cytokines might play a role in the pathophysiology of disk disease&#46; These findings could potentially be used by future studies to develop new LBP therapeutic strategies&#46;</p></span><span id="sec0085" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0145">Authors&#8217; contributions</span><p id="par0300" class="elsevierStylePara elsevierViewall"><ul class="elsevierStyleList" id="lis0010"><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">-</span><p id="par0305" class="elsevierStylePara elsevierViewall">Dr&#46; Maroua SLOUMA&#58; Methodology and Writing &#8211; review &#38; editing</p></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">-</span><p id="par0310" class="elsevierStylePara elsevierViewall">Dr&#46; Lobna KHARRAT&#58; Roles&#47;Writing &#8211; original draft</p></li><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">-</span><p id="par0315" class="elsevierStylePara elsevierViewall">Dr&#46; Aymen TEZEGDENTI&#58; data curation and funding acquisition</p></li><li class="elsevierStyleListItem" id="lsti0030"><span class="elsevierStyleLabel">-</span><p id="par0320" class="elsevierStylePara elsevierViewall">Dr&#46; Rim DHAHRI&#58; formal analysis</p></li><li class="elsevierStyleListItem" id="lsti0035"><span class="elsevierStyleLabel">-</span><p id="par0325" class="elsevierStylePara elsevierViewall">Dr Ezzeddine GHAZOUANI&#58; project administration</p></li><li class="elsevierStyleListItem" id="lsti0040"><span class="elsevierStyleLabel">-</span><p id="par0330" class="elsevierStylePara elsevierViewall">Dr&#46; Leila METOUI&#58; conceptualisation</p></li><li class="elsevierStyleListItem" id="lsti0045"><span class="elsevierStyleLabel">-</span><p id="par0335" class="elsevierStylePara elsevierViewall">Dr&#46; Imen GHARSALLAH&#58; visualization</p></li><li class="elsevierStyleListItem" id="lsti0050"><span class="elsevierStyleLabel">-</span><p id="par0340" class="elsevierStylePara elsevierViewall">Dr&#46; Bassem LOUZIR&#58; visualization and validation</p></li></ul></p></span><span id="sec0090" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0150">Availability of data and material</span><p id="par0345" class="elsevierStylePara elsevierViewall">The datasets used and&#47;or analyzed during the current study are available from the corresponding author on reasonable request&#46;</p></span><span id="sec0095" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0155">Code availability &#40;software application or custom code&#41;</span><p id="par0350" class="elsevierStylePara elsevierViewall">Not applicable&#46;</p></span><span id="sec0100" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0160">Ethics approval</span><p id="par0355" class="elsevierStylePara elsevierViewall">This study was approved by the ethics committee of the Hospital&#46;</p></span><span id="sec0105" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0165">Consent to participate</span><p id="par0360" class="elsevierStylePara elsevierViewall">A consent has been signed by each patient&#46;</p></span><span id="sec0110" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0170">Funding</span><p id="par0365" class="elsevierStylePara elsevierViewall">The authors declare that they have no funding for the research&#46;</p></span><span id="sec0115" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0175">Conflict of interest</span><p id="par0370" class="elsevierStylePara elsevierViewall">None&#46;</p></span></span>"
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        "resumen" => "<span id="abst0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0010">Introduction and objectives</span><p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">There are controversial results regarding the value of serum IL-8 and TNF&#945; in patients with non-specific low back pain&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">This study aimed to compare pro-inflammatory cytokines between patients with non-specific back pain and pain-free controls&#46;</p></span> <span id="abst0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0015">Materials and methods</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">We conducted a case&#8211;control study including 106 participants&#58; 46 patients with chronic non-specific low back pain &#40;G1&#41; and 60 pain-free controls &#40;G0&#41;&#46; The interleukin &#40;IL-&#41;6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22&#44; and Tumor necrosis factor &#945; &#40;TNF&#945;&#41; were measured&#46; We collected demographic and clinical data&#44; including age&#44; gender&#44; low back pain duration and radicular pain&#46; The pain degree was assessed using the Visual Analogic Scale&#46;</p></span> <span id="abst0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0020">Results</span><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">The mean age was 43&#46;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#46;7 years in G1&#46; Radicular pain was found in 37 cases with a Visual Analogic Scale of 3&#46;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;5<span class="elsevierStyleHsp" style=""></span>mm&#46; The magnetic resonance imaging was performed in &#40;G1&#41;&#44; showing disk herniation and degenerative disk disease in 54&#46;3&#37; &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>25&#41; and 45&#46;7&#37; of cases &#40;<span class="elsevierStyleItalic">n</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&#44; respectively&#46; The IL-8 was higher in G1 &#40;18&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#46;64 versus 4&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;23<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;033&#41;&#46; IL-8 levels correlated with TNF&#945; &#40;0&#46;942&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10&#8211;3&#41;&#44; IL-6 &#40;0&#46;490&#44; <span class="elsevierStyleItalic">p</span><span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;011&#41; and Visual Analogic Scale<span class="elsevierStyleInf">Radicular-pain</span> &#40;<span class="elsevierStyleItalic">r</span>&#58;0&#46;297&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;047&#41;&#46;</p><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">IL-17 was higher in patients with restricted lumbar spine mobility &#40;9&#46;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#46;77 versus 1&#46;19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;54<span class="elsevierStyleHsp" style=""></span>pg&#47;mL&#44; <span class="elsevierStyleItalic">p</span>&#58;0&#46;014&#41;&#46;</p></span> <span id="abst0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0025">Conclusions</span><p id="spar0030" class="elsevierStyleSimplePara elsevierViewall">Our results provide evidence that IL-8 and TNF&#945; play a role in low back pain and radicular pain due to disk degeneration or herniation&#46; These findings could potentially be used by future studies to develop new non-specific low back pain therapeutic strategies&#46;</p></span>"
        "secciones" => array:4 [
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        "resumen" => "<span id="abst0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0035">Introducci&#243;n y objetivos</span><p id="spar0035" class="elsevierStyleSimplePara elsevierViewall">Existen resultados controvertidos en cuanto al valor de la interleucina &#40;IL&#41; 8 y el factor de necrosis tumoral &#945; &#40;TNF&#945;&#41; s&#233;ricos en pacientes con lumbalgia inespec&#237;fica&#46;</p><p id="spar0040" class="elsevierStyleSimplePara elsevierViewall">Este estudio tuvo como objetivo comparar las citoquinas proinflamatorias entre pacientes con dolor de espalda inespec&#237;fico y controles sin dolor&#46;</p></span> <span id="abst0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0040">Materiales y m&#233;todos</span><p id="spar0045" class="elsevierStyleSimplePara elsevierViewall">Realizamos un estudio de casos y controles que incluy&#243; a 106 participantes&#58; 46 pacientes con dolor lumbar cr&#243;nico inespec&#237;fico &#40;G1&#41; y 60 controles sin dolor &#40;G0&#41;&#46; Se midieron las IL-6&#44; IL-8&#44; IL-17&#44; IL-23&#44; IL-22 y el TNF&#945;&#46; Recopilamos datos demogr&#225;ficos y cl&#237;nicos&#44; incluidos la edad&#44; el sexo&#44; la duraci&#243;n del dolor lumbar y el dolor radicular&#46; El grado de dolor se evalu&#243; mediante la escala anal&#243;gica visual&#46;</p></span> <span id="abst0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0045">Resultados</span><p id="spar0050" class="elsevierStyleSimplePara elsevierViewall">La edad media fue de 43&#44;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>8&#44;7 a&#241;os en G1&#46; Se encontr&#243; dolor radicular en 37 casos con una escala anal&#243;gica visual de 3&#44;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#44;5<span class="elsevierStyleHsp" style=""></span>mm&#46; La resonancia magn&#233;tica se realiz&#243; en G1&#44; mostrando hernia discal y enfermedad discal degenerativa en el 54&#44;3&#37; &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>25&#41; y el 45&#44;7&#37; de los casos &#40;n<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>21&#41;&#44; respectivamente&#46; La IL-8 fue mayor en G1 &#40;18&#44;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#44;64 versus 4&#44;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#44;23<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;033&#41;&#46; Los niveles de IL-8 se correlacionaron con TNF&#945; &#40;0&#44;942&#44; p<span class="elsevierStyleHsp" style=""></span>&#60;<span class="elsevierStyleHsp" style=""></span>10<span class="elsevierStyleSup">&#8722;3</span>&#41;&#44; IL-6 &#40;0&#44;490&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;011&#41; y escala visual anal&#243;gica<span class="elsevierStyleInf">dolor radicular</span> &#40;r<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;297&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;047&#41;&#46;</p><p id="spar0055" class="elsevierStyleSimplePara elsevierViewall">IL-17 fue mayor en pacientes con movilidad restringida de la columna lumbar &#40;9&#44;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>20&#44;77 versus 1&#44;19<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#44;54<span class="elsevierStyleHsp" style=""></span>pg&#47;ml&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;014&#41;&#46;</p></span> <span id="abst0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0050">Conclusiones</span><p id="spar0060" class="elsevierStyleSimplePara elsevierViewall">Nuestros resultados proporcionan evidencia de que la IL-8 y el TNF&#945; juegan un papel en el dolor lumbar y en el dolor radicular debido a la degeneraci&#243;n o a hernia discal&#46; Estos hallazgos podr&#237;an potencialmente ser utilizados por estudios futuros para desarrollar nuevas estrategias terap&#233;uticas no espec&#237;ficas para el dolor lumbar&#46;</p></span>"
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                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">38&#46;43<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>9&#46;57&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">27&#46;31<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>3&#46;47&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleItalic">Smoking &#40;n &#40;&#37;&#41;&#41;</span>&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">13 &#40;28&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttop\n
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                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3 &#40;6&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Hypertension &#40;<span class="elsevierStyleItalic">n</span> &#40;&#37;&#41;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">2 &#40;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Dyslipidemia &#40;<span class="elsevierStyleItalic">n</span> &#40;&#37;&#41;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="2" align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " colspan="2" align="left" valign="\n
                  \t\t\t\t\ttop\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Radicular pain &#40;<span class="elsevierStyleItalic">n</span> &#40;&#37;&#41;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">37 &#40;80&#46;4&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>VAS<span class="elsevierStyleInf">back</span><span class="elsevierStyleInf">pain</span>&#44; mean<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>SD&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3&#46;79<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;95&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>VAS<span class="elsevierStyleInf">radicular</span><span class="elsevierStyleInf">pain</span>&#44; mean<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>SD&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">3&#46;03<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;5&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Disk herniation &#40;<span class="elsevierStyleItalic">n</span> &#40;&#37;&#41;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">25 &#40;54&#46;3&#37;&#41;&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t"><span class="elsevierStyleHsp" style=""></span>Degenerative disk disease &#40;<span class="elsevierStyleItalic">n</span> &#40;&#37;&#41;&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">21 &#40;45&#46;7&#37;&#41;&nbsp;\t\t\t\t\t\t\n
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                  """
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                  \t\t\t\t" scope="col" style="border-bottom: 2px solid black">Normal&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
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                  \t\t\t\t">2&#46;17<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;05&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1&#46;09<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;28&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">1&#46;83<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;01&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">2&#46;5<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;61&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">7&#46;25<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>2&#46;44&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">13&#46;11<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>31&#46;92&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">0&#46;324&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">15&#46;45<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>38&#46;18&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">7&#46;64<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;33&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">0&#46;53&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td-with-role" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t ; entry_with_role_rowhead " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">IL-8&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
                  \t\t\t\t  " align="char" valign="\n
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                  \t\t\t\t">4&#46;34<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>1&#46;23&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">18&#46;84<span class="elsevierStyleHsp" style=""></span>&#177;<span class="elsevierStyleHsp" style=""></span>44&#46;64&nbsp;\t\t\t\t\t\t\n
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