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leading to the development of the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Its diagnosis is rare before age 40&#44; and in most series predominates in males&#46; Its geographical distribution is uneven with areas of high prevalence&#44; with familial aggregation detected in most series&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Most patients are asymptomatic&#44; with the predominant form being polyostotic involvement&#46; The main symptoms&#44; when present&#44; are bone pain and deformity&#46; The diagnosis is made with imaging by plain radiography&#44; and scintigraphy with Technecium<span class="elsevierStyleSup">99</span>&#44; something that enables the making of a topographic map of the disease&#46; Other imaging techniques are resorted to in cases that raise diagnostic doubts&#46; The evaluation of biochemical markers of bone turnover provides indirect information of both disease activity and the therapeutic response&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">On the basis of pathogenic features of PD&#44; treatment with antiresorptive drugs is used to achieve normalization of bone turnover&#46; Since the introduction of bisphosphonates in 1970&#44; these agents have become the treatment of choice<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#8211;13</span></a> because of their better efficacy and safety profile compared to then used calcitonin&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Targets and Therapeutic Indications</span><p id="par0030" class="elsevierStylePara elsevierViewall">Before discussing the main drugs available and their individual characteristics&#44; let us define the goals of treatment and the main indications&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The goal of treatment is control of symptoms and normalization of remodeling markers&#44; all without altering the mineralization and normalizing bone structure&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> What we are trying to achieve is to prevent future complications with early therapeutic intervention&#44; a fact that at present has no evidence to support it&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Treatment</span><p id="par0040" class="elsevierStylePara elsevierViewall">There are widely accepted guidelines&#44; including consensus recommendations&#44;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5&#44;7&#44;9&#8211;14</span></a> as described below&#58;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">&#8226;</span><p id="par0045" class="elsevierStylePara elsevierViewall">Symptomatic patients &#40;bone pain from the disease or secondary to fragility fractures&#44; neurological compression syndromes&#44; heart failure due to treatment&#41;&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">&#8226;</span><p id="par0050" class="elsevierStylePara elsevierViewall">Preoperative treatment of elective surgery on the Pagetic bone to prevent intraoperative bleeding complications&#46;</p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">&#8226;</span><p id="par0055" class="elsevierStylePara elsevierViewall">Hypercalcemia&#46; Appears infrequently and occurs in patients with extensive involvement and after periods of prolonged immobilization&#46;</p></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">&#8226;</span><p id="par0060" class="elsevierStylePara elsevierViewall">Impact of critical areas susceptible to developing severe complications &#40;long bones&#44; skull base&#44; spine especially above L2 and adjacent to large joints&#44; lytic lesions&#41;&#46;</p></li></ul></p><p id="par0065" class="elsevierStylePara elsevierViewall">The dilemma of therapeutic intervention in PD is present in asymptomatic patients with biochemical or imaging activity&#46; Treatment aims to prevent development of complications with early intervention&#46; Recommendations are based on studies of low statistical power and theoretical considerations&#46; In fact in 2010&#44; the PRISM<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> study was published&#44; comparing two treatment strategies with bisphosphonates&#59; an aggressive approach in which patients were treated when there was alkaline phosphatase elevation whether symptomatic or not&#44; and the outcome being the primary biochemical normalization&#59; and another&#44; treating only symptomatic patients&#46; The intention was to determine whether an intensive strategy in asymptomatic patients but with biochemical activity prevented the development of further complications&#46; No differences were found between groups in the prosthetic hip replacement numbers&#44; number of fractures&#44; hearing loss or improved quality of life&#46; The study has limitations in design and a limited follow-up time &#40;3 year on average&#41;&#44; as well the fact that zoledronic acid&#44; the most potent drug available at present&#44; was not evaluated&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Therefore&#44; well-designed studies are needed to determine long-term prevention of the development of complications in PD and to provide data that may condition decisive therapeutic decisions&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Anyway&#44; even despite the lack of evidence&#44; the tendency is to treat patients who have greater risk of future complications&#46;</p></span></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Pharmacotherapy</span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Modulators of the Activity</span><p id="par0080" class="elsevierStylePara elsevierViewall">The mainstay of treatment of the PD is the use of antiresorptive agents in order to reduce high bone turnover and osteoclast activity&#46; Over the years various drugs have been used&#44; but since the introduction of bisphosphonates in 1970&#44; they have become the antiresorptive treatment of choice&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">All bisphosphonates share a common chemical structure &#40;two phosphate molecules attached to a carbon atom&#41;&#46; They are synthetic analogs of pyrophosphate with antiresorptive potency&#44; and act by reducing bone remodeling and resorption&#46; The effect is achieved by both osteoclast differentiation of stem cells as common precursor&#44; promoting apoptosis of mature osteoclasts&#46; According to their structure&#44; they are classified depending on whether they contain an amino group or not &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#44; with amino-bisphosphonates having demonstrated a better efficacy and safety profile&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0090" class="elsevierStylePara elsevierViewall">Bisphosphonates approved for use in the PD marketed in Spain are&#58; pamidronate&#44; risedronate and zoledronic acid &#40;amino&#41; and non-amino group drugs such as etidronate and tiludronate &#40;<a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46; Other bisphosphonates have demonstrated efficacy in Paget&#39;s disease but have not been marketed for this indication in Spain &#40;alendronate&#44; ibandronate&#44; neridronate&#44; olpadronate and clodronate&#41;&#46;<ul class="elsevierStyleList" id="lis0010"><li class="elsevierStyleListItem" id="lsti0025"><span class="elsevierStyleLabel">&#8226;</span><p id="par0095" class="elsevierStylePara elsevierViewall">First generation bisphosphonates<ul class="elsevierStyleList" id="lis0015"><li class="elsevierStyleListItem" id="lsti0030"><p id="par0100" class="elsevierStylePara elsevierViewall">Non-amino bisphosphonates have been displaced by the amino-bisphosphonates as the treatment of choice&#44; and the former are used only in case of contraindication to the latter compounds&#46;</p></li><li class="elsevierStyleListItem" id="lsti0120"><p id="par0255" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleUnderline">Etidronate</span> was the first bisphosphonate used in PD and showed a greater reduction in bone turnover than calcitonin&#44; the antiresorptive agent used at that time&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> However&#44; the detection of alterations in bone mineralization secondary to the use of etidronate limited the dose and duration of use &#40;not to exceed 6 months&#41;&#46; Early reactivation of the disease and the emergence of resistance in some patients<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> were also noted&#46;</p></li><li class="elsevierStyleListItem" id="lsti0125"><p id="par0260" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleUnderline">Tiludronate</span> proved superior to etidronate without the appearance of alterations in mineralization&#44; achieving a reduction of alkaline phosphatase between 30&#46;5&#37; and 76&#46;1&#37; which remained at 12 months in up to 69&#37; of patients&#46;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">18&#8211;22</span></a></p></li><li class="elsevierStyleListItem" id="lsti0130"><p id="par0265" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleUnderline">Clodronate</span> has no indication for PD in Spain&#46; The efficacy is similar to that of etidronate&#44; although with longer periods of remission&#46; It does not have effects on bone mineralization&#46;<a class="elsevierStyleCrossRefs" href="#bib0115"><span class="elsevierStyleSup">23&#44;24</span></a></p></li></ul></p></li><li class="elsevierStyleListItem" id="lsti0035"><span class="elsevierStyleLabel">&#8226;</span><p id="par0105" class="elsevierStylePara elsevierViewall">Amino-bisphosphonates<ul class="elsevierStyleList" id="lis0020"><li class="elsevierStyleListItem" id="lsti0040"><p id="par0110" class="elsevierStylePara elsevierViewall">The treatment of Paget&#39;s disease suffered a shift in 1979 with the publication of a study using oral<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a><span class="elsevierStyleUnderline">pamidronate</span>&#46; An antiresorptive&#44; it led to rapid restoration of normal bone formation&#46; This study led to a series of publications on the use of pamidronate in PD&#44; both orally and intravenously&#44; demonstrating its superiority over other non-aminated bisphosphonates&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#8211;31</span></a> The currently approved regimen is intravenous &#40;doses in <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46; No alterations in bone mineralization have been described&#44; but resistance has been detected on those patients retreated with this drug&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a></p></li><li class="elsevierStyleListItem" id="lsti0045"><p id="par0115" class="elsevierStylePara elsevierViewall">Later came the development of another amino-bisphosphonate&#44; <span class="elsevierStyleUnderline">alendronate</span>&#46; Its efficacy was established in two randomized clinical trials&#44; one alone and another vs placebo&#44;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> or etidronate&#44;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> showing a normalization of the alkaline phosphatase in 60&#37;&#8211;70&#37; of patients at 6 months&#46; In 2004&#44; a comparative study of oral alendronate vs IV pamidronate<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> was published&#46; No differences were found between both treatment groups when it came to patients not receiving bisphosphonates&#44; but alendronate was superior in patients previously treated with pamidronate&#46; Alendronate has no indication for PD in our country&#46;</p></li></ul></p><p id="par0120" class="elsevierStylePara elsevierViewall">In parallel with alendronate&#44; <span class="elsevierStyleUnderline">risedronate</span> was developed&#44; demonstrating its efficacy in open<a class="elsevierStyleCrossRefs" href="#bib0180"><span class="elsevierStyleSup">36&#8211;38</span></a> studies and against etidronate&#44;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a> reducing alkaline phosphatase in 66&#37;&#8211;80&#37;&#46; Currently the amino-bisphosphonate risedronate is the only oral drug indicated in our country for PD&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">The most recently introduced bisphosphonate in the treatment of PD is <span class="elsevierStyleUnderline">zoledronic acid</span>&#46; It is a bisphosphonate that has shown affinity for hydroxyapatite in vitro and the most potent antiresorptive we currently have&#46;<a class="elsevierStyleCrossRefs" href="#bib0200"><span class="elsevierStyleSup">40&#44;41</span></a> It is administered as a single intravenous infusion of 5<span class="elsevierStyleHsp" style=""></span>mg&#46; Two randomized trials comparing single infusion zoledronic acid with risedronate oral<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a> exist&#46; Zoledronic acid improved response at 6 months in 96&#37; of responding patients compared to 74&#46;3&#37; in the risedronate group&#44; and was associated with a faster and maintained response&#46; These results will be confirmed in a 2 and 5-year extension study&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">In 2007&#44; the results of a study comparing different IV bisphosphonates<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">43</span></a> were published&#46; Compared to pamidronate&#44; another bisphosphonate indicated intravenously in our country for PD&#44; zoledronic acid was more effective and associates with an earlier response&#44; with more pamidronate infusions required and with the development of resistance to treatment&#46; Further studies are needed to expand the evidence&#44; but for now zoledronic acid is better&#44; with results in both induction and maintenance of remission&#46;</p></li><li class="elsevierStyleListItem" id="lsti0050"><span class="elsevierStyleLabel">&#8226;</span><p id="par0135" class="elsevierStylePara elsevierViewall">Other drugs<ul class="elsevierStyleList" id="lis0025"><li class="elsevierStyleListItem" id="lsti0055"><p id="par0140" class="elsevierStylePara elsevierViewall">Although the new bisphosphonates are drugs with a good safety profile and relatively well tolerated&#44; there are situations in which we cannot use them&#46;</p></li><li class="elsevierStyleListItem" id="lsti0060"><p id="par0145" class="elsevierStylePara elsevierViewall">In these cases the peptide hormone calcitonin&#44; capable of inhibiting bone resorption&#44; could be useful&#46; It was used in the treatment of PD&#44; but relapses after discontinuation of treatment and a plateau effect after approximately 4&#8211;6 months of treatment&#44; relegated it to the backburner after the appearance of bisphosphonates&#46;</p></li><li class="elsevierStyleListItem" id="lsti0065"><p id="par0150" class="elsevierStylePara elsevierViewall">Other therapies such as gallium nitrate are used only in patients with serious complications or bisphosphonate resistance because it has a limited effect and frequent<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">44</span></a> recurrences&#46; Mithramycin is no longer used due to its renal&#44; bone marrow and liver<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">45</span></a> toxicity&#46;</p></li></ul></p></li><li class="elsevierStyleListItem" id="lsti0070"><span class="elsevierStyleLabel">&#8226;</span><p id="par0155" class="elsevierStylePara elsevierViewall">Calcium and vitamin D<ul class="elsevierStyleList" id="lis0030"><li class="elsevierStyleListItem" id="lsti0075"><p id="par0160" class="elsevierStylePara elsevierViewall">Another fundamental aspect in the treatment of PD is calcium &#40;1000<span class="elsevierStyleHsp" style=""></span>mg&#41; and vitamin D &#40;400&#8211;800<span class="elsevierStyleHsp" style=""></span>IU&#41; supplementation in patients receiving antiresorptive therapy to prevent hypocalcemia and secondary hyperparathyroidism&#46;</p></li><li class="elsevierStyleListItem" id="lsti0080"><p id="par0165" class="elsevierStylePara elsevierViewall">The standard dose is indicated&#44; but must be individualized by laboratory testing&#44; enhancing supplementation in the case of zoledronic acid in the days before and after its infusion&#46;</p></li></ul></p></li></ul></p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Symptoms</span><p id="par0170" class="elsevierStylePara elsevierViewall">Apart from specific treatment&#44; we must effectively manage symptoms&#46; The main symptom is pain&#44; which may not always be derived from the activity of the disease&#44; but may be secondary to complications and localized lesions&#46; It is mainly treated with NSAIDs and analgesics&#44; with tricyclic antidepressants being useful in some cases&#46;</p><p id="par0175" class="elsevierStylePara elsevierViewall">On the other hand&#44; we should not forget orthotic treatment&#44; walking and hearing aids&#44; canes&#44; etc&#46;&#44; which may help improve the quality of life of patients&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Surgery</span><p id="par0180" class="elsevierStylePara elsevierViewall">There are five main indications for surgical treatment<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;46</span></a>&#58;<ul class="elsevierStyleList" id="lis0035"><li class="elsevierStyleListItem" id="lsti0085"><span class="elsevierStyleLabel">1&#46;</span><p id="par0185" class="elsevierStylePara elsevierViewall">Fractures&#46;</p></li><li class="elsevierStyleListItem" id="lsti0090"><span class="elsevierStyleLabel">2&#46;</span><p id="par0190" class="elsevierStylePara elsevierViewall">Deformity&#58; that cause pain when they are difficult to control or associated with bone fissures&#44; corrected through the use of osteotomy&#46;</p></li><li class="elsevierStyleListItem" id="lsti0095"><span class="elsevierStyleLabel">3&#46;</span><p id="par0195" class="elsevierStylePara elsevierViewall">Pagetic arthropathy&#58; arthroplasty when symptoms are not effectively controlled with medical treatment&#46;</p></li><li class="elsevierStyleListItem" id="lsti0100"><span class="elsevierStyleLabel">4&#46;</span><p id="par0200" class="elsevierStylePara elsevierViewall">Entrapment neuropathies and myelopathies&#46;</p></li><li class="elsevierStyleListItem" id="lsti0105"><span class="elsevierStyleLabel">5&#46;</span><p id="par0205" class="elsevierStylePara elsevierViewall">Cancer&#46;</p></li></ul></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Monitoring of Therapeutic Response</span><p id="par0210" class="elsevierStylePara elsevierViewall">Biomarkers of bone turnover indirectly estimate the activity of the disease<a class="elsevierStyleCrossRefs" href="#bib0235"><span class="elsevierStyleSup">47&#8211;49</span></a> and are therefore used in the assessment of treatment response in conjunction with the clinical response&#46; Currently&#44; despite the development of new markers&#44; total alkaline phosphatase &#40;TAP&#41; remains the marker of choice for monitoring response to treatment&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5&#44;7&#44;9&#44;50&#44;51</span></a> Historically&#44; therapeutic response has been defined as a decrease of at least 25&#37; of TAP&#59; however&#44; with current drugs&#44; most studies measuring response set their objective as the normalization of biochemical markers or alternatively&#44; as the decrease of at least 75&#37; of initial TAP&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall">However&#44; and given the spectrum of presentations of PD&#44; there are cases where other markers are more useful than TAP&#46; In patients with monostotic involvement with normal TAP or patients with liver disease&#44; the use of more sensitive markers such as alkaline phosphatase &#40;AP&#41; and the aminoterminal propeptide of procollagen type I &#40;APPPI&#41; is recommended&#46;<a class="elsevierStyleCrossRefs" href="#bib0250"><span class="elsevierStyleSup">50&#44;51</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall">Regarding the role of bone scintigraphy in monitoring therapeutic response&#44; it has been relegated to isolated cases in which the patient is exposed to radiation and there is a delay of approximately 6 months with respect to the biochemical response&#46; In patients with monostotic PD and normal bone turnover markers at baseline&#44; it could be useful from 6 to 12 months after treatment&#46;</p><p id="par0225" class="elsevierStylePara elsevierViewall">As for biomarker monitoring intervals should be individualized based on treatment and individual patient characteristics&#46; A possibility would be the quarterly analytical monitoring the first 6 months and then every 6 months&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a></p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Retreatment</span><p id="par0230" class="elsevierStylePara elsevierViewall">The need for a new cycle of treatment occurs when there is a new increase of bone remodeling&#46; At the onset of the disease or after the increase of the biomarkers discussed in the previous section&#44; it is important to determine parameters that measure activity&#46; Therefore&#44; and according to the available evidence&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> we recommend a new course of treatment in cases of&#58;<ul class="elsevierStyleList" id="lis0040"><li class="elsevierStyleListItem" id="lsti0110"><span class="elsevierStyleLabel">&#8226;</span><p id="par0235" class="elsevierStylePara elsevierViewall">Recurrence of symptoms and&#47;or</p></li><li class="elsevierStyleListItem" id="lsti0115"><span class="elsevierStyleLabel">&#8226;</span><p id="par0240" class="elsevierStylePara elsevierViewall">Increased alkaline phosphatase above normal&#44; or more than 25&#37; of the nadir reached&#46;</p></li></ul></p><p id="par0245" class="elsevierStylePara elsevierViewall">To clarify&#44; since the effect of bisphosphonate treatment usually appears 3&#8211;6 months after onset of treatment&#44; it is prudent to wait 6 months before determining the need for a new therapeutic intervention&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Disclosures</span><p id="par0250" class="elsevierStylePara elsevierViewall">The authors have no disclosures to make&#46;</p></span></span>"
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          "titulo" => "Targets and Therapeutic Indications"
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              "titulo" => "Modulators of the Activity"
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          "titulo" => "Surgery"
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          "identificador" => "sec0040"
          "titulo" => "Monitoring of Therapeutic Response"
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    "fechaRecibido" => "2011-05-30"
    "fechaAceptado" => "2011-06-09"
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          "palabras" => array:4 [
            0 => "Paget&#39;s disease of bone"
            1 => "Osteitis deformans"
            2 => "Treatment"
            3 => "Bisphosphonates"
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          "palabras" => array:4 [
            0 => "Enfermedad &#243;sea de Paget"
            1 => "Oste&#237;tis deformante"
            2 => "Tratamiento"
            3 => "Bifosfonatos"
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        "titulo" => "Abstract"
        "resumen" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Paget&#39;s disease of bone is the paradigm of bone focal distortion with accelerated bone turnover&#46; Over the years&#44; a number of different drugs have been used to control its activity but&#44; since bisphosphonates were introduced for the treatment of the disease&#44; they have become the preferred treatment&#46; This review will update the therapeutic indications&#44; available drugs and therapeutic response monitoring&#46;</p>"
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      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">La enfermedad &#243;sea de Paget es el paradigma de alteraci&#243;n focal esquel&#233;tica con remodelado &#243;seo acelerado&#46; A lo largo de los a&#241;os se han utilizado diferentes f&#225;rmacos para el control de la actividad pero&#44; desde la introducci&#243;n de los bifosfonatos en la terap&#233;utica de esta enfermedad&#44; &#233;stos se han convertido en el tratamiento de elecci&#243;n&#46; A lo largo de esta revisi&#243;n se abordar&#225;n de manera actualizada las indicaciones terap&#233;uticas&#44; los f&#225;rmacos disponibles y la monitorizaci&#243;n de la respuesta&#46;</p>"
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        "nota" => "<p class="elsevierStyleNotepara">Please&#44; cite this article as&#58; Lojo Oliveira L&#44; Torrijos Eslava A&#46; Tratamiento de la enfermedad &#243;sea de Paget&#46; Reumatol Clin&#46; 2012&#59;8&#58;220&#8211;4&#46;</p>"
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                  \t\t\t\t">Non-Aminated Bisphosphonates&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Aminated Bisphosphonates&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">EtidronateTiludronateClodronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">PamidronateAlendronateRisedronateIbandronateNeridronateOlpadronateZolendronic acid&nbsp;\t\t\t\t\t\t\n
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                  <table border="0" frame="\n
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                  \t\t\t\t">Etidronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#47;day&#44; 6 months&#44; oral&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Tiludronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">400<span class="elsevierStyleHsp" style=""></span>mg&#47;day&#44; 3 months&#44; oral&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Risedronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">30<span class="elsevierStyleHsp" style=""></span>mg&#47;day 2 months&#44; oral&nbsp;\t\t\t\t\t\t\n
                  \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  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Pamidronate&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="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">30<span class="elsevierStyleHsp" style=""></span>mg&#47;week &#40;6 doses&#41; or a first dose of 30<span class="elsevierStyleHsp" style=""></span>mg then 60<span class="elsevierStyleHsp" style=""></span>mg&#47;2 week &#40;3 doses&#41; &#40;total dose 180&#8211;210<span class="elsevierStyleHsp" style=""></span>mg&#41;&nbsp;\t\t\t\t\t\t\n
                  \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  " align="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">Zolendronic acid&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="left" valign="\n
                  \t\t\t\t\ttop\n
                  \t\t\t\t">5<span class="elsevierStyleHsp" style=""></span>mg IV single dose&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr></tbody></table>
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          "en" => "<p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">Bisphosphonate Doses Approved in Spain for PD&#46;</p>"
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Continuing medical education
Treatment of Paget's Disease of Bone
Tratamiento de la enfermedad ósea de Paget
Leticia Lojo Oliveira
Corresponding author
leticialojooliveira2@yahoo.es

Corresponding author.
, Antonio Torrijos Eslava
Unidad Metabólica Ósea, Servicio de Reumatología, Hospital Universitario La Paz, Madrid, Spain
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leading to the development of the disease&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">Its diagnosis is rare before age 40&#44; and in most series predominates in males&#46; Its geographical distribution is uneven with areas of high prevalence&#44; with familial aggregation detected in most series&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0020" class="elsevierStylePara elsevierViewall">Most patients are asymptomatic&#44; with the predominant form being polyostotic involvement&#46; The main symptoms&#44; when present&#44; are bone pain and deformity&#46; The diagnosis is made with imaging by plain radiography&#44; and scintigraphy with Technecium<span class="elsevierStyleSup">99</span>&#44; something that enables the making of a topographic map of the disease&#46; Other imaging techniques are resorted to in cases that raise diagnostic doubts&#46; The evaluation of biochemical markers of bone turnover provides indirect information of both disease activity and the therapeutic response&#46;</p><p id="par0025" class="elsevierStylePara elsevierViewall">On the basis of pathogenic features of PD&#44; treatment with antiresorptive drugs is used to achieve normalization of bone turnover&#46; Since the introduction of bisphosphonates in 1970&#44; these agents have become the treatment of choice<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#8211;13</span></a> because of their better efficacy and safety profile compared to then used calcitonin&#46;</p></span><span id="sec0010" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Targets and Therapeutic Indications</span><p id="par0030" class="elsevierStylePara elsevierViewall">Before discussing the main drugs available and their individual characteristics&#44; let us define the goals of treatment and the main indications&#46;</p><p id="par0035" class="elsevierStylePara elsevierViewall">The goal of treatment is control of symptoms and normalization of remodeling markers&#44; all without altering the mineralization and normalizing bone structure&#46;<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">11</span></a> What we are trying to achieve is to prevent future complications with early therapeutic intervention&#44; a fact that at present has no evidence to support it&#46;</p><span id="sec0015" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Treatment</span><p id="par0040" class="elsevierStylePara elsevierViewall">There are widely accepted guidelines&#44; including consensus recommendations&#44;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5&#44;7&#44;9&#8211;14</span></a> as described below&#58;<ul class="elsevierStyleList" id="lis0005"><li class="elsevierStyleListItem" id="lsti0005"><span class="elsevierStyleLabel">&#8226;</span><p id="par0045" class="elsevierStylePara elsevierViewall">Symptomatic patients &#40;bone pain from the disease or secondary to fragility fractures&#44; neurological compression syndromes&#44; heart failure due to treatment&#41;&#46;</p></li><li class="elsevierStyleListItem" id="lsti0010"><span class="elsevierStyleLabel">&#8226;</span><p id="par0050" class="elsevierStylePara elsevierViewall">Preoperative treatment of elective surgery on the Pagetic bone to prevent intraoperative bleeding complications&#46;</p></li><li class="elsevierStyleListItem" id="lsti0015"><span class="elsevierStyleLabel">&#8226;</span><p id="par0055" class="elsevierStylePara elsevierViewall">Hypercalcemia&#46; Appears infrequently and occurs in patients with extensive involvement and after periods of prolonged immobilization&#46;</p></li><li class="elsevierStyleListItem" id="lsti0020"><span class="elsevierStyleLabel">&#8226;</span><p id="par0060" class="elsevierStylePara elsevierViewall">Impact of critical areas susceptible to developing severe complications &#40;long bones&#44; skull base&#44; spine especially above L2 and adjacent to large joints&#44; lytic lesions&#41;&#46;</p></li></ul></p><p id="par0065" class="elsevierStylePara elsevierViewall">The dilemma of therapeutic intervention in PD is present in asymptomatic patients with biochemical or imaging activity&#46; Treatment aims to prevent development of complications with early intervention&#46; Recommendations are based on studies of low statistical power and theoretical considerations&#46; In fact in 2010&#44; the PRISM<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">15</span></a> study was published&#44; comparing two treatment strategies with bisphosphonates&#59; an aggressive approach in which patients were treated when there was alkaline phosphatase elevation whether symptomatic or not&#44; and the outcome being the primary biochemical normalization&#59; and another&#44; treating only symptomatic patients&#46; The intention was to determine whether an intensive strategy in asymptomatic patients but with biochemical activity prevented the development of further complications&#46; No differences were found between groups in the prosthetic hip replacement numbers&#44; number of fractures&#44; hearing loss or improved quality of life&#46; The study has limitations in design and a limited follow-up time &#40;3 year on average&#41;&#44; as well the fact that zoledronic acid&#44; the most potent drug available at present&#44; was not evaluated&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">Therefore&#44; well-designed studies are needed to determine long-term prevention of the development of complications in PD and to provide data that may condition decisive therapeutic decisions&#46;</p><p id="par0075" class="elsevierStylePara elsevierViewall">Anyway&#44; even despite the lack of evidence&#44; the tendency is to treat patients who have greater risk of future complications&#46;</p></span></span><span id="sec0020" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Pharmacotherapy</span><span id="sec0025" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Modulators of the Activity</span><p id="par0080" class="elsevierStylePara elsevierViewall">The mainstay of treatment of the PD is the use of antiresorptive agents in order to reduce high bone turnover and osteoclast activity&#46; Over the years various drugs have been used&#44; but since the introduction of bisphosphonates in 1970&#44; they have become the antiresorptive treatment of choice&#46;</p><p id="par0085" class="elsevierStylePara elsevierViewall">All bisphosphonates share a common chemical structure &#40;two phosphate molecules attached to a carbon atom&#41;&#46; They are synthetic analogs of pyrophosphate with antiresorptive potency&#44; and act by reducing bone remodeling and resorption&#46; The effect is achieved by both osteoclast differentiation of stem cells as common precursor&#44; promoting apoptosis of mature osteoclasts&#46; According to their structure&#44; they are classified depending on whether they contain an amino group or not &#40;<a class="elsevierStyleCrossRef" href="#tbl0005">Table 1</a>&#41;&#44; with amino-bisphosphonates having demonstrated a better efficacy and safety profile&#46;</p><elsevierMultimedia ident="tbl0005"></elsevierMultimedia><p id="par0090" class="elsevierStylePara elsevierViewall">Bisphosphonates approved for use in the PD marketed in Spain are&#58; 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the antiresorptive agent used at that time&#46;<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">16</span></a> However&#44; the detection of alterations in bone mineralization secondary to the use of etidronate limited the dose and duration of use &#40;not to exceed 6 months&#41;&#46; Early reactivation of the disease and the emergence of resistance in some patients<a class="elsevierStyleCrossRef" href="#bib0085"><span class="elsevierStyleSup">17</span></a> were also noted&#46;</p></li><li class="elsevierStyleListItem" id="lsti0125"><p id="par0260" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleUnderline">Tiludronate</span> proved superior to etidronate without the appearance of alterations in mineralization&#44; achieving a reduction of alkaline phosphatase between 30&#46;5&#37; and 76&#46;1&#37; which remained at 12 months in up to 69&#37; of patients&#46;<a class="elsevierStyleCrossRefs" href="#bib0090"><span class="elsevierStyleSup">18&#8211;22</span></a></p></li><li class="elsevierStyleListItem" id="lsti0130"><p id="par0265" class="elsevierStylePara elsevierViewall"><span class="elsevierStyleUnderline">Clodronate</span> has no indication for PD in Spain&#46; The efficacy is similar to that of etidronate&#44; although with longer periods of remission&#46; It does not have effects on bone mineralization&#46;<a class="elsevierStyleCrossRefs" href="#bib0115"><span class="elsevierStyleSup">23&#44;24</span></a></p></li></ul></p></li><li class="elsevierStyleListItem" id="lsti0035"><span class="elsevierStyleLabel">&#8226;</span><p id="par0105" class="elsevierStylePara elsevierViewall">Amino-bisphosphonates<ul class="elsevierStyleList" id="lis0020"><li class="elsevierStyleListItem" id="lsti0040"><p id="par0110" class="elsevierStylePara elsevierViewall">The treatment of Paget&#39;s disease suffered a shift in 1979 with the publication of a study using oral<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">25</span></a><span class="elsevierStyleUnderline">pamidronate</span>&#46; An antiresorptive&#44; it led to rapid restoration of normal bone formation&#46; This study led to a series of publications on the use of pamidronate in PD&#44; both orally and intravenously&#44; demonstrating its superiority over other non-aminated bisphosphonates&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">26&#8211;31</span></a> The currently approved regimen is intravenous &#40;doses in <a class="elsevierStyleCrossRef" href="#tbl0010">Table 2</a>&#41;&#46; No alterations in bone mineralization have been described&#44; but resistance has been detected on those patients retreated with this drug&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">32</span></a></p></li><li class="elsevierStyleListItem" id="lsti0045"><p id="par0115" class="elsevierStylePara elsevierViewall">Later came the development of another amino-bisphosphonate&#44; <span class="elsevierStyleUnderline">alendronate</span>&#46; Its efficacy was established in two randomized clinical trials&#44; one alone and another vs placebo&#44;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">33</span></a> or etidronate&#44;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">34</span></a> showing a normalization of the alkaline phosphatase in 60&#37;&#8211;70&#37; of patients at 6 months&#46; In 2004&#44; a comparative study of oral alendronate vs IV pamidronate<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">35</span></a> was published&#46; No differences were found between both treatment groups when it came to patients not receiving bisphosphonates&#44; but alendronate was superior in patients previously treated with pamidronate&#46; Alendronate has no indication for PD in our country&#46;</p></li></ul></p><p id="par0120" class="elsevierStylePara elsevierViewall">In parallel with alendronate&#44; <span class="elsevierStyleUnderline">risedronate</span> was developed&#44; demonstrating its efficacy in open<a class="elsevierStyleCrossRefs" href="#bib0180"><span class="elsevierStyleSup">36&#8211;38</span></a> studies and against etidronate&#44;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">39</span></a> reducing alkaline phosphatase in 66&#37;&#8211;80&#37;&#46; Currently the amino-bisphosphonate risedronate is the only oral drug indicated in our country for PD&#46;</p><p id="par0125" class="elsevierStylePara elsevierViewall">The most recently introduced bisphosphonate in the treatment of PD is <span class="elsevierStyleUnderline">zoledronic acid</span>&#46; It is a bisphosphonate that has shown affinity for hydroxyapatite in vitro and the most potent antiresorptive we currently have&#46;<a class="elsevierStyleCrossRefs" href="#bib0200"><span class="elsevierStyleSup">40&#44;41</span></a> It is administered as a single intravenous infusion of 5<span class="elsevierStyleHsp" style=""></span>mg&#46; Two randomized trials comparing single infusion zoledronic acid with risedronate oral<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">42</span></a> exist&#46; Zoledronic acid improved response at 6 months in 96&#37; of responding patients compared to 74&#46;3&#37; in the risedronate group&#44; and was associated with a faster and maintained response&#46; These results will be confirmed in a 2 and 5-year extension study&#46;</p><p id="par0130" class="elsevierStylePara elsevierViewall">In 2007&#44; the results of a study comparing different IV bisphosphonates<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">43</span></a> were published&#46; Compared to pamidronate&#44; another bisphosphonate indicated intravenously in our country for PD&#44; zoledronic acid was more effective and associates with an earlier response&#44; with more pamidronate infusions required and with the development of resistance to treatment&#46; Further studies are needed to expand the evidence&#44; but for now zoledronic acid is better&#44; with results in both induction and maintenance of remission&#46;</p></li><li class="elsevierStyleListItem" id="lsti0050"><span class="elsevierStyleLabel">&#8226;</span><p id="par0135" class="elsevierStylePara elsevierViewall">Other drugs<ul class="elsevierStyleList" id="lis0025"><li class="elsevierStyleListItem" id="lsti0055"><p id="par0140" class="elsevierStylePara elsevierViewall">Although the new bisphosphonates are drugs with a good safety profile and relatively well tolerated&#44; there are situations in which we cannot use them&#46;</p></li><li class="elsevierStyleListItem" id="lsti0060"><p id="par0145" class="elsevierStylePara elsevierViewall">In these cases the peptide hormone calcitonin&#44; capable of inhibiting bone resorption&#44; could be useful&#46; It was used in the treatment of PD&#44; but relapses after discontinuation of treatment and a plateau effect after approximately 4&#8211;6 months of treatment&#44; relegated it to the backburner after the appearance of bisphosphonates&#46;</p></li><li class="elsevierStyleListItem" id="lsti0065"><p id="par0150" class="elsevierStylePara elsevierViewall">Other therapies such as gallium nitrate are used only in patients with serious complications or bisphosphonate resistance because it has a limited effect and frequent<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">44</span></a> recurrences&#46; Mithramycin is no longer used due to its renal&#44; bone marrow and liver<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">45</span></a> toxicity&#46;</p></li></ul></p></li><li class="elsevierStyleListItem" id="lsti0070"><span class="elsevierStyleLabel">&#8226;</span><p id="par0155" class="elsevierStylePara elsevierViewall">Calcium and vitamin D<ul class="elsevierStyleList" id="lis0030"><li class="elsevierStyleListItem" id="lsti0075"><p id="par0160" class="elsevierStylePara elsevierViewall">Another fundamental aspect in the treatment of PD is calcium &#40;1000<span class="elsevierStyleHsp" style=""></span>mg&#41; and vitamin D &#40;400&#8211;800<span class="elsevierStyleHsp" style=""></span>IU&#41; supplementation in patients receiving antiresorptive therapy to prevent hypocalcemia and secondary hyperparathyroidism&#46;</p></li><li class="elsevierStyleListItem" id="lsti0080"><p id="par0165" class="elsevierStylePara elsevierViewall">The standard dose is indicated&#44; but must be individualized by laboratory testing&#44; enhancing supplementation in the case of zoledronic acid in the days before and after its infusion&#46;</p></li></ul></p></li></ul></p><elsevierMultimedia ident="tbl0010"></elsevierMultimedia></span></span><span id="sec0030" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Symptoms</span><p id="par0170" class="elsevierStylePara elsevierViewall">Apart from specific treatment&#44; we must effectively manage symptoms&#46; The main symptom is pain&#44; which may not always be derived from the activity of the disease&#44; but may be secondary to complications and localized lesions&#46; It is mainly treated with NSAIDs and analgesics&#44; with tricyclic antidepressants being useful in some cases&#46;</p><p id="par0175" class="elsevierStylePara elsevierViewall">On the other hand&#44; we should not forget orthotic treatment&#44; walking and hearing aids&#44; canes&#44; etc&#46;&#44; which may help improve the quality of life of patients&#46;</p></span><span id="sec0035" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Surgery</span><p id="par0180" class="elsevierStylePara elsevierViewall">There are five main indications for surgical treatment<a class="elsevierStyleCrossRefs" href="#bib0025"><span class="elsevierStyleSup">5&#44;46</span></a>&#58;<ul class="elsevierStyleList" id="lis0035"><li class="elsevierStyleListItem" id="lsti0085"><span class="elsevierStyleLabel">1&#46;</span><p id="par0185" class="elsevierStylePara elsevierViewall">Fractures&#46;</p></li><li class="elsevierStyleListItem" id="lsti0090"><span class="elsevierStyleLabel">2&#46;</span><p id="par0190" class="elsevierStylePara elsevierViewall">Deformity&#58; that cause pain when they are difficult to control or associated with bone fissures&#44; corrected through the use of osteotomy&#46;</p></li><li class="elsevierStyleListItem" id="lsti0095"><span class="elsevierStyleLabel">3&#46;</span><p id="par0195" class="elsevierStylePara elsevierViewall">Pagetic arthropathy&#58; arthroplasty when symptoms are not effectively controlled with medical treatment&#46;</p></li><li class="elsevierStyleListItem" id="lsti0100"><span class="elsevierStyleLabel">4&#46;</span><p id="par0200" class="elsevierStylePara elsevierViewall">Entrapment neuropathies and myelopathies&#46;</p></li><li class="elsevierStyleListItem" id="lsti0105"><span class="elsevierStyleLabel">5&#46;</span><p id="par0205" class="elsevierStylePara elsevierViewall">Cancer&#46;</p></li></ul></p></span><span id="sec0040" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Monitoring of Therapeutic Response</span><p id="par0210" class="elsevierStylePara elsevierViewall">Biomarkers of bone turnover indirectly estimate the activity of the disease<a class="elsevierStyleCrossRefs" href="#bib0235"><span class="elsevierStyleSup">47&#8211;49</span></a> and are therefore used in the assessment of treatment response in conjunction with the clinical response&#46; Currently&#44; despite the development of new markers&#44; total alkaline phosphatase &#40;TAP&#41; remains the marker of choice for monitoring response to treatment&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5&#44;7&#44;9&#44;50&#44;51</span></a> Historically&#44; therapeutic response has been defined as a decrease of at least 25&#37; of TAP&#59; however&#44; with current drugs&#44; most studies measuring response set their objective as the normalization of biochemical markers or alternatively&#44; as the decrease of at least 75&#37; of initial TAP&#46;<a class="elsevierStyleCrossRef" href="#bib0065"><span class="elsevierStyleSup">13</span></a></p><p id="par0215" class="elsevierStylePara elsevierViewall">However&#44; and given the spectrum of presentations of PD&#44; there are cases where other markers are more useful than TAP&#46; In patients with monostotic involvement with normal TAP or patients with liver disease&#44; the use of more sensitive markers such as alkaline phosphatase &#40;AP&#41; and the aminoterminal propeptide of procollagen type I &#40;APPPI&#41; is recommended&#46;<a class="elsevierStyleCrossRefs" href="#bib0250"><span class="elsevierStyleSup">50&#44;51</span></a></p><p id="par0220" class="elsevierStylePara elsevierViewall">Regarding the role of bone scintigraphy in monitoring therapeutic response&#44; it has been relegated to isolated cases in which the patient is exposed to radiation and there is a delay of approximately 6 months with respect to the biochemical response&#46; In patients with monostotic PD and normal bone turnover markers at baseline&#44; it could be useful from 6 to 12 months after treatment&#46;</p><p id="par0225" class="elsevierStylePara elsevierViewall">As for biomarker monitoring intervals should be individualized based on treatment and individual patient characteristics&#46; A possibility would be the quarterly analytical monitoring the first 6 months and then every 6 months&#46;<a class="elsevierStyleCrossRefs" href="#bib0020"><span class="elsevierStyleSup">4&#44;5</span></a></p></span><span id="sec0045" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Retreatment</span><p id="par0230" class="elsevierStylePara elsevierViewall">The need for a new cycle of treatment occurs when there is a new increase of bone remodeling&#46; At the onset of the disease or after the increase of the biomarkers discussed in the previous section&#44; it is important to determine parameters that measure activity&#46; Therefore&#44; and according to the available evidence&#44;<a class="elsevierStyleCrossRef" href="#bib0045"><span class="elsevierStyleSup">9</span></a> we recommend a new course of treatment in cases of&#58;<ul class="elsevierStyleList" id="lis0040"><li class="elsevierStyleListItem" id="lsti0110"><span class="elsevierStyleLabel">&#8226;</span><p id="par0235" class="elsevierStylePara elsevierViewall">Recurrence of symptoms and&#47;or</p></li><li class="elsevierStyleListItem" id="lsti0115"><span class="elsevierStyleLabel">&#8226;</span><p id="par0240" class="elsevierStylePara elsevierViewall">Increased alkaline phosphatase above normal&#44; or more than 25&#37; of the nadir reached&#46;</p></li></ul></p><p id="par0245" class="elsevierStylePara elsevierViewall">To clarify&#44; since the effect of bisphosphonate treatment usually appears 3&#8211;6 months after onset of treatment&#44; it is prudent to wait 6 months before determining the need for a new therapeutic intervention&#46;</p></span><span id="sec0050" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle">Disclosures</span><p id="par0250" class="elsevierStylePara elsevierViewall">The authors have no disclosures to make&#46;</p></span></span>"
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          "titulo" => "Keywords"
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          "titulo" => "Introduction"
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          "titulo" => "Targets and Therapeutic Indications"
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          "titulo" => "Pharmacotherapy"
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              "titulo" => "Modulators of the Activity"
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          "titulo" => "Symptoms"
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          "identificador" => "sec0035"
          "titulo" => "Surgery"
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        9 => array:2 [
          "identificador" => "sec0040"
          "titulo" => "Monitoring of Therapeutic Response"
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        10 => array:2 [
          "identificador" => "sec0045"
          "titulo" => "Retreatment"
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          "identificador" => "sec0050"
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    "fechaRecibido" => "2011-05-30"
    "fechaAceptado" => "2011-06-09"
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          "clase" => "keyword"
          "titulo" => "Keywords"
          "identificador" => "xpalclavsec113091"
          "palabras" => array:4 [
            0 => "Paget&#39;s disease of bone"
            1 => "Osteitis deformans"
            2 => "Treatment"
            3 => "Bisphosphonates"
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          "clase" => "keyword"
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          "palabras" => array:4 [
            0 => "Enfermedad &#243;sea de Paget"
            1 => "Oste&#237;tis deformante"
            2 => "Tratamiento"
            3 => "Bifosfonatos"
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      "en" => array:2 [
        "titulo" => "Abstract"
        "resumen" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">Paget&#39;s disease of bone is the paradigm of bone focal distortion with accelerated bone turnover&#46; Over the years&#44; a number of different drugs have been used to control its activity but&#44; since bisphosphonates were introduced for the treatment of the disease&#44; they have become the preferred treatment&#46; This review will update the therapeutic indications&#44; available drugs and therapeutic response monitoring&#46;</p>"
      ]
      "es" => array:2 [
        "titulo" => "Resumen"
        "resumen" => "<p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">La enfermedad &#243;sea de Paget es el paradigma de alteraci&#243;n focal esquel&#233;tica con remodelado &#243;seo acelerado&#46; A lo largo de los a&#241;os se han utilizado diferentes f&#225;rmacos para el control de la actividad pero&#44; desde la introducci&#243;n de los bifosfonatos en la terap&#233;utica de esta enfermedad&#44; &#233;stos se han convertido en el tratamiento de elecci&#243;n&#46; A lo largo de esta revisi&#243;n se abordar&#225;n de manera actualizada las indicaciones terap&#233;uticas&#44; los f&#225;rmacos disponibles y la monitorizaci&#243;n de la respuesta&#46;</p>"
      ]
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        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara">Please&#44; cite this article as&#58; Lojo Oliveira L&#44; Torrijos Eslava A&#46; Tratamiento de la enfermedad &#243;sea de Paget&#46; Reumatol Clin&#46; 2012&#59;8&#58;220&#8211;4&#46;</p>"
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                  \t\t\t\t">Non-Aminated Bisphosphonates&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Aminated Bisphosphonates&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t\ttop\n
                  \t\t\t\t">EtidronateTiludronateClodronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">PamidronateAlendronateRisedronateIbandronateNeridronateOlpadronateZolendronic acid&nbsp;\t\t\t\t\t\t\n
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          "en" => "<p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">Classification of Bisphosphonates According to Their Amino Group&#46;</p>"
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                  <table border="0" frame="\n
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                  \t\t\t\t">Etidronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5<span class="elsevierStyleHsp" style=""></span>mg&#47;kg&#47;day&#44; 6 months&#44; oral&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Tiludronate&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">400<span class="elsevierStyleHsp" style=""></span>mg&#47;day&#44; 3 months&#44; oral&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Risedronate&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">30<span class="elsevierStyleHsp" style=""></span>mg&#47;day 2 months&#44; oral&nbsp;\t\t\t\t\t\t\n
                  \t\t\t\t</td></tr><tr title="table-row"><td class="td" title="\n
                  \t\t\t\t\ttable-entry\n
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                  \t\t\t\t">Pamidronate&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">30<span class="elsevierStyleHsp" style=""></span>mg&#47;week &#40;6 doses&#41; or a first dose of 30<span class="elsevierStyleHsp" style=""></span>mg then 60<span class="elsevierStyleHsp" style=""></span>mg&#47;2 week &#40;3 doses&#41; &#40;total dose 180&#8211;210<span class="elsevierStyleHsp" style=""></span>mg&#41;&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">Zolendronic acid&nbsp;\t\t\t\t\t\t\n
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                  \t\t\t\t">5<span class="elsevierStyleHsp" style=""></span>mg IV single dose&nbsp;\t\t\t\t\t\t\n
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Idiomas
Reumatología Clínica (English Edition)
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