6Diagnosis of primary biliary cirrhosis
Introduction
Primary biliary cirrhosis (PBC) is the most common of the autoimmune liver diseases, and is broadly speaking at least twice as common as the other members of the “autoimmune liver disease family” which constitutes autoimmune hepatitis (AIH) and primary sclerosing cholangitis (PSC) [1], [2]. Present estimates place the prevalence of disease at around 1 in 1000 women over the age of 40 [3], [4]. Whilst the classic patient might be stereotyped as a Caucasian woman in her 50 s, in fact PBC is prevalent in all ethnicities (albeit very uncommon in African Americans), can present in young pre-menopausal fertile women, and does affect men. Given that PBC is a chronic granulomatous lymphocytic cholangitis, classically associated with the presence of circulating anti-mitochondrial antibodies, and a disease that necessitates lifelong therapy, it remains important to establish a clear diagnosis at the outset (see Table 1 for the differential diagnosis), in order to help patients be well educated about their disease and its expected course. Except in the earliest of disease, this is generally possible so long as a systematic approach to investigation is taken. This review outlines the facets relevant to making an appropriate diagnosis of PBC, in order that intervention if appropriate can be started (Fig. 1).
Section snippets
Historical perspective
Some recognition of the historical perspective helps present day care, as it highlights disease concepts still pertinent to patient management [5]. Addison and Gull in 1851 made the original description, recognizing PBC not because it was a clear liver disease, but as patients presented with significant skin manifestations of cholestasis i.e. xanthelasmas composed of cholesterol. Subsequently Thannhauser [6] described PBC as “xanthomatous cirrhosis” with the more classic description of PBC as a
Epidemiologic perspectives
In approaching a patient being reviewed for possible PBC it is also helpful to appreciate some of the epidemiologic observations made from retrospective/cross-sectional analysis of large cohorts of patients and controls. Aside from the value such studies offer in terms of determining relative contributions of environmental and genetic influences on disease (e.g. spatial and temporal associations with the diagnosis of PBC [24], [25]), they also provide important points to discuss with patients.
Clinical presentation
Of asymptomatic patients diagnosed today many are screened following routine identification of an elevated serum alkaline phosphatase (ALP) or gamma-glutamyltransferase (GGT) e.g. life insurance bloods, annual screening labs. Frequent other scenarios of course arise, including screening of patients with autoimmune diseases such as scleroderma, investigation of elevated cholesterol, incidental liver bloodwork as part of evaluation for abdominal discomfort, evaluation of itch, unresolved
Clinical investigations
Diagnosing PBC is generally not difficult, and this is important because it facilitates early diagnosis and treatment. Presently the challenges faced by clinicians come when disease is at a very early stage, when the patient is AMA negative and when there is potential disease overlap, predominantly with fatty liver. Individuals are most often diagnosed with PBC between the ages 40 of 60 years. Symptomatic patients seem likely to be diagnosed younger than asymptomatic subjects, partly because
Variant presentations/differential diagnosis
Clearly patient presentation can be quite varied, and careful history taking can identify patients for whom different evaluation is needed. Additionally it remains the case that co-existent viral and metabolic liver disease should always be sought. The broad differential diagnosis of PBC is as shown in Table 1. AMA-negative patients with PBC lack AMA (by immunofluorescence, ELISA and Western blotting) but have a clinical presentation, liver histology, and natural history essentially equivalent
Summary
PBC is the classic autoimmune liver disease. Whilst patients are presenting at an earlier asymptomatic stage, diagnosis generally remains simple, and rests upon taking a good history, simple examination, and timely testing for readily available serologic markers of disease. Common symptoms such as fatigue, itch and sicca complex should be ascertained as should risk factors for disease (e.g. smoking, family history of autoimmunity, personal history of autoimmunity), whilst at the same time,
Conflict of interest
The author declares no relevant conflict of interest relevant to the preparation of this review.
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2018, European Journal of Internal MedicineCitation Excerpt :UDCA-responsive patients will generally show biochemical improvement within 6–9 months; however, non-responder patients, up to 40%, are at risk for progressive decline of their condition [33]. Factors that influence response to treatment and therefore PBC outcome are: sex and age at diagnosis, with male sex and young age at diagnosis being independent predictors of UDCA non-response [34], in addition to PBC-specific Anti-Nuclear Antibodies (ANA) positivity (anti-multiple nuclear dot, anti-nuclear envelope protein, and anti-rim-like/membranous anti-nuclear autoantibodies) [1,2], biochemical markers of fibrosis, liver stiffness, presence of cirrhosis and/or portal hypertension, and ductopenia [35,36]. A number of options are under investigation as second line treatment for patients non responders to UDCA.
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2016, Journal of Clinical and Experimental HepatologyCitation Excerpt :Hepatocyte expression of major histocompatibility complex (MHC) class I is also induced by BAs, which provides another mechanism by which immune cell-mediated injury can occur.19 The diagnosis of PBC may be implicated in the setting of cholestatic liver injury and supported with demonstration of circulating AMAb—though the presence of AMA is not absolute and may be absent in 10% of cases.20 The American Association for the Study of Liver Disease recommends that diagnosis be based on two of the three following criteria: “(1) biochemical evidence of cholestasis with elevation in alkaline phosphatase (ALP); (2) presence of AMAb; and (3) histopathological evidence of nonsuppurative cholangitis and destruction of small or medium-sized interlobular bile ducts on biopsy.21”