Introduction
Background
Primary biliary cirrhosis (PBC) is a chronic and progressive cholestatic disease of the liver. The etiology is unknown, although it is presumed to be autoimmune in nature. The major pathology of this disease is a destruction of the small-to-medium bile ducts, which leads to progressive cholestasis and often end-stage liver disease.
In 1851, Addison and Gull described the clinical picture of progressive obstructive jaundice in the absence of mechanical obstruction of the large bile ducts. In 1950, Ahrens and colleagues named this disease primary biliary cirrhosis.1 The term is controversial because cirrhosis only develops late in the course of the disease.
Primary biliary cirrhosis is most frequently a disease of women and occurs between the fourth and sixth decades of life. The symptoms may strongly affect patients' quality of life and may induce incapacitation. Various therapeutic approaches have been implemented with variable results; in selected candidates, liver transplantation is the only treatment option for the terminal stages of the disease. After the procedure, the disease has a relatively high recurrence rate despite immunosuppressive therapy.
The image below demonstrates the histologic appearance of stage 2 primary biliary cirrhosis.
Pathophysiology
The exact mechanism of the liver damage is unknown, although evidence indicates that it can be of autoimmune origin. The data supporting this hypothesis are as follows: (1) abnormalities of the humoral and cellular immune systems (ie, elevated serum levels of immunoglobulins, mainly immunoglobulin M [IgM]), (2) multiple circulating autoantibodies, (3) granulomas in the liver and regional lymph nodes, (4) impaired regulation of both B and T lymphocytes, and (5) the association of this disease with a variety of autoimmune-mediated diseases (eg, autoimmune thyroiditis; keratoconjunctivitis sicca; scleroderma; calcinosis cutis, Raynaud phenomenon, esophageal motility disorder, sclerodactyly, and telangiectasia [CREST] syndrome).2
A continuous destruction of small and medium bile ducts occurs, which is mediated by activated CD4 and CD8 lymphocytes. As a result, chronic cholestasis is the prominent clinical and laboratory finding. Once destroyed, it is well established that regeneration of bile ducts is either not possible or inefficient.
Subsequent to the loss of the intrahepatic bile ducts, a disruption of the normal bile flow occurs with retention and deposition of toxic substances, which are normally excreted into bile. The retention of toxic substances, such as bile acids and copper, can cause a further secondary destruction of the bile ducts and the hepatocytes. In addition, increased expression of the HLA class II antigens in the liver occurs, rendering hepatocytes and bile duct epithelial cells more susceptible to activated T lymphocytes and perhaps exacerbating immunologically mediated cytotoxicity. An association has been suggested between primary biliary cirrhosis and haplotype HLA-DR8 and, for some populations, HLA-DPB1.
In a controlled, interview-based study of 1032 patients, Gershwin et al noted that in genetically susceptible persons, environmental factors, including chemicals found in cigarette smoke and infectious agents introduced through urinary tract infections, may induce primary biliary cirrhosis. The authors stated that exogenous estrogens may also contribute to the disease's development and that this may help to explain why the disease occurs more frequently in females than in males.3,4
Frequency
United States
Although the epidemiology of primary biliary cirrhosis has not been studied systematically, the published prevalence is 65.4 cases for women and 12.1 cases for men (40.2 cases overall) per 100,000 population. The incidence of the disease has been estimated as 4.5 cases for women and 0.7 cases for men (2.7 cases overall) per 100,000 population.
International
Primary biliary cirrhosis is reported to be more prevalent in the United Kingdom and Scandinavia. The prevalence of the disease has been estimated as 24 cases per 100,000 population in Newcastle, United Kingdom; 12.9 cases per 100,000 population in Northeast England; 1.9 cases per 100,000 population in Victoria, Australia; 2.2 cases per 100,000 population in Ontario, Canada; 2.7 cases per 100,000 population in Estonia; 9.2 cases per 100,000 in Malmö, Sweden; and 15.1 cases per 100,000 population in Umea, Sweden.
Mortality/Morbidity
For asymptomatic patients with antimitochondrial antibody (AMA)–positive findings, a normal biochemical liver profile, and histologic features that are compatible with primary biliary cirrhosis, the progression of the disease is relatively slow; however, the patient life expectancy is not identical to that of the general population. Of these patients, 40-67% develop symptomatic disease in approximately 5-7 years. Once they develop symptoms (mainly cholestasis) and remain untreated, the median patient survival duration ranges from 5.5-12 years. Generally, the median survival duration from the time of diagnosis is 7.5 years for patients who are symptomatic and 16 years for patients who are asymptomatic.
Significant changes in the mortality rate have been noticed since the early 1980s with an increase in the age of death. This might be a consequence of treatment.5
Race
Primary biliary cirrhosis is more common in Northern Europeans and is less common in populations of African descent.
Sex
Women account for 75-90% of patients with primary biliary cirrhosis. Males who are affected have a disease course similar to that of females; however, men appear to be more likely to develop hepatocellular carcinoma.
Age
Primary biliary cirrhosis mostly affects middle-aged women, with a mean age of 39 years. Onset usually occurs in persons aged 30-65 years. However, patients as young as 22 years and as old as 93 years at the time of diagnosis have been reported.
Clinical
History
Of patients with primary biliary cirrhosis, 25% are incidentally diagnosed during a routine blood evaluation.
- Fatigue (65%)
- Fatigue is the first reported symptom. It can cause disability in some patients and has been associated with depression and obsessive-compulsive behavior. The etiology is unknown; however, a sleep abnormality, particularly excessive daytime somnolence, has been identified in a significant proportion of patients and has been associated with the degree of fatigue.
- No correlation exists between this symptom and the stage of the liver disease, the height of the levels of liver enzymes, the Mayo model score, or the duration of therapy.
- The etiology of fatigue is unclear; although some evidence suggests that abnormalities of the hypothalamic-pituitary-adrenal axis, decreased release of serotonin, and increased production of proinflammatory cytokines (ie, interleukin-1 [IL-1], interleukin-6 [IL-6], tumor necrosis factor-a [TNF-a ]) may be responsible.6
- Pruritus (55%)
- According to estimates, 10% of patients experience severe pruritus.
- The cause of this symptom is not known.
- Pruritus appears unrelated to the deposition of bile acids in the skin.
- Increased opioidergic tone (ie, increased production of endogenous opioid peptides, up-regulation of endogenous opioid receptors) appears to be the major mechanism. The height of the bilirubin level is proportionally related to the production of these peptides.
- Right upper quadrant discomfort occurs in 8-17% of patients.
Physical
Physical examination findings depend on the stage of the disease. In the early stages, examination findings are normal. As the disease advances, excoriations of the skin, xanthelasmata, or findings of cirrhosis may be present.
- Hepatomegaly (25%)
- Hyperpigmentation (25%)
- Splenomegaly (15%)
- Jaundice (10%)
- Xanthelasmata (10%) - In late stages of the disease
- Sicca syndrome (50-75%) - Xerophthalmia (ie, dry eyes), xerostomia (ie, dry mouth)
- Kayser-Fleischer rings (extremely rare)
- Stigmata of advanced liver disease (ie, cirrhosis), such as spider nevi, palmar erythema, ascites, temporal and proximal muscle wasting, and peripheral edema
Causes
Primary biliary cirrhosis is a disease of unknown etiology, but various factors have been implicated as the causes of this illness.
- Genetic factors: First-degree relatives have a 570- to 1000-fold increased chance of developing primary biliary cirrhosis. The presence of an inherited abnormality of immune regulation has been proposed.
- Infection with organisms of the family Enterobacteriaceae: Cross-reactivity between antigens on the bacterial wall and the mitochondria has been postulated. Patients with primary biliary cirrhosis present with an increased incidence of gram-negative urinary tract infections.
More on Primary Biliary Cirrhosis |
Overview: Primary Biliary Cirrhosis |
| Differential Diagnoses & Workup: Primary Biliary Cirrhosis |
| Treatment & Medication: Primary Biliary Cirrhosis |
| Follow-up: Primary Biliary Cirrhosis |
| Multimedia: Primary Biliary Cirrhosis |
| References |
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References
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Further Reading
Clinical trials
Use of Fenofibrate for Primary Biliary Cirrhosis
Initial Study of Rituximab to Treat Primary Biliary Cirrhosis
Modafinil in the Treatment of Fatigue in Patients With Primary Biliary Cirrhosis (PBC)
Related eMedicine topics
Biliary Disease
Biliary Obstruction
Cirrhosis
Primary Sclerosing Cholangitis
Bile Duct Strictures
Keywords
primary biliary cirrhosis, cirrhosis, PBC, liver cirrhosis, cirrhosis of the liver, antinuclear antibody, antinuclear antibodies, chronic nonsuppurative destructive cholangitis, autoimmune liver disease, ductopenia, liver granulomas, progressive cholestasis, end-stage liver disease, progressive obstructive jaundice


Overview: Primary Biliary Cirrhosis