Underestimated Male Prevalence of Primary Biliary Cholangitis in China: Results of a 16-yr cohort study involving 769 patients

Letter: Fibrates may be safe and effective in patients with primary biliary cholangitis and decompensated cirrhosis

This article is linked to Hofer et al papers. To view these articles, visit https://doi.org/10.1111/apt.17908 and https://doi.org/10.1111/apt.18067.

Guidelines on the Diagnosis and Management of Primary Biliary Cholangitis (2021)

In 2015, the Chinese Society of Hepatology and the Chinese Society of Gastroenterology published a consensus on primary biliary cholangitis (PBC). In the past years, numerous clinical studies have been published in the field of PBC. To guide the clinical diagnosis and management of PBC patients, the Chinese Society of Hepatology invited a panel of experts to assess the new clinical evidence and formulate the current guidelines.

Primary Biliary Cholangitis: Promising Emerging Innovative Therapies and Their Impact on GLOBE Scores

Primary biliary cholangitis (PBC), previously referred to as primary biliary cirrhosis, is an autoimmune disorder leading to the destruction of intra-hepatic bile ducts. If untreated, progressive bile duct damage and cholestasis can lead to ductopenia and result in cirrhosis. Ursodiol, the first drug approved for PBC, has changed the natural history of this disease and improved patient outcomes. Subsequently, several new prediction models incorporating a response to ursodiol were developed. These include the GLOBE score, which was shown to predict long-term outcomes in patients with PBC. In 2016, obeticholic acid (OCA) became the second drug to be approved by the FDA, predominantly based on improvement in alkaline phosphatase (ALP) levels. This trial has subsequently influenced the design of clinical trials. Several drugs are currently being evaluated as therapeutic options for PBC, with improvement in ALP being a main endpoint. In this review, we will discuss the impact of new therapies on GLOBE scores in patients with PBC.

TR score: A noninvasive model to predict histological stages in patients with primary biliary cholangitis

Introduction

The aim of this study was to develop a noninvasive prediction model for histological stages in PBC that is simple, easy to implement, and highly accurate.

Methods

A total of 114 patients with PBC were included in this study. Demographic, laboratory data and histological assessments were collected. The independent predictors of histological stages were selected to establish a noninvasive serological model. The scores of 22 noninvasive models were calculated and compared with the established model.

Results

This study included 99 females (86.8%) and 15 males (13.2%). The number of patients in Scheuer’s stage 1, 2, 3 and 4 was 33 (29.0%), 34 (29.8%), 16 (14.0%), and 31 (27.2%), respectively. TBA and RDW are independent predictors of PBC histological stages. The above indexes were used to establish a noninvasive model-TR score. When predicting early histological change (S1) or liver fibrosis and cirrhosis (S3-S4), the AUROC of TR score were 0.887 (95% CI, 0.809-0.965) and 0.893 (95% CI, 0.816-0.969), higher than all of the other 22 models included in this study. When predicting cirrhosis (S4), its AUROC is still as high as 0.921 (95% CI, 0.837-1.000).

Conclusion

TR score is an easy, cheap and stable noninvasive model, without complex calculation formulas and tools, and shows good accuracy in diagnosing the histological stages of PBC.

Primary Biliary Cholangitis in Males: Pathogenesis, Clinical Presentation, and Prognosis

Primary biliary cholangitis (PBC) is an immune-mediated chronic liver disease characterized by progressive cholestasis, bile duct destruction, biliary fibrosis, and cirrhosis. Patients who respond to ursodeoxycholic acid have an expected survival similar to the general population. Although PBC primarily affects females, the prevalence in males is higher than was previously believed, with contemporary studies suggesting a female-to-male ratio of 4-6:1. A diagnosis of PBC is often delayed among males because of the myth that PBC is rare in males.

Rare liver diseases are not rare in China

Rare diseases, also known as orphan diseases, are a group of diseases that affect a relatively small number of people. Low incidence rates, atypical symptoms, imperfect diagnosis criteria and few treatment options impose medical, psychological and financial stress on the local healthcare system. The spectrum of liver diseases in China has changed in the past decades due to successful control of once highly prevalent viral hepatitis B and C. Furthermore, the increased awareness and improved availability of specific laboratory tests have also facilitated the diagnosis of rare diseases such as autoimmune, cholestatic and genetic liver diseases. Finally, considering the huge population, the total number of many rare liver diseases in China is not as rare as once deemed. In this mini-review article, we will outline the current clinical and epidemiological profiles of some rare liver diseases that are no longer rare in China.

Gender and Autoimmune Liver Diseases: Relevant Aspects in Clinical Practice

Autoimmune liver diseases (AILDs) include autoimmune hepatitis, primary biliary cholangitis and primary sclerosing cholangitis. The etiologies of AILD are not well understood but appear to involve a combination of genetic and environmental factors. AILDs commonly affect young individuals and are characterized by a highly variable clinical course. These diseases significantly influence quality of life and can progress toward liver decompensation or the onset of hepatocellular or cholangiocarcinoma; a significant number of patients eventually progress to end-stage liver disease, requiring liver transplantation. In this review, we focus on the sex characteristics and peculiarities of AILD patients and highlight the relevance of a sex-specific analysis in future studies. Understanding the sex differences underlying AILD immune dysregulation may be critical for developing more effective treatments.

Rates of decompensation, hepatocellular carcinoma and mortality in AMA-negative primary biliary cholangitis cirrhosis

BACKGROUND

The natural history of patients with anti-mitochondrial antibody (AMA)-negative Primary Biliary Cholangitis (PBC) cirrhosis has not been well defined, with prior studies showing discordant results. Furthermore, most studies of AMA-negative PBC have limited numbers of patients with cirrhosis and liver-related outcomes.

METHODS

We investigated the association of AMA-negative PBC and the development of death, liver-related death, decompensation and hepatocellular carcinoma (HCC), in a large cohort of predominantly male patients with PBC cirrhosis assembled from the Veterans Health Administration.

RESULTS

In a cohort of 521 patients with PBC cirrhosis (65 AMA-negative) with a total follow-up of 2504.3 person-years (PY) from cirrhosis diagnosis, patients with AMA-negative PBC were younger and more likely to be black but had similar rates of UDCA response. AMA-negative PBC cirrhosis was associated with similar unadjusted rates of liver-related death (4.6 vs 5.9 per 100 PY, P = .44), overall death (7.7 vs 9.6 per 100 PY, P = .31), decompensation (7.3 vs 5.1 per 100 PY, P = .12) and HCC (0.6 vs 1.0 per 100 PY, P = .63) to AMA-positive PBC. After adjusting for confounders, AMA-negative PBC cirrhosis was associated with similar rates of liver-related death (sub-Hazard Ratio [sHR] 1.27, 95% CI 0.71-2.28, P = .42, death [sHR] 1.24, 95% CI 0.81-1.90, P = .32), decompensation (sHR 1.05, 95% CI 0.56-1.98, P = .87) and HCC (sHR 0.48, 95% CI 0.11-2.10, P = .33) to AMA-positive patients.

CONCLUSION

In a cohort of predominantly male patients, AMA-negative PBC cirrhosis was associated with similar rates of overall or liver-related death, HCC or decompensation compared with AMA-positive disease.

Real-World Management of Patients with Primary Biliary Cholangitis-A Retrospective Study from a Tertiary Medical Center in Israel

Background: Primary biliary cholangitis (PBC) is a rare autoimmune liver disease with variation in prevalence, phenotype and prognosis across different geographical regions. Little is known about PBC in Israel. Our aim was to characterize the demography, clinical presentation, treatment patterns and prognosis in a cohort of PBC patients followed in a referral center in central Israel. Methods: Clinical, demographic and laboratory data were collected from the medical records of PBC patients followed at Tel Aviv Medical Center in the years 2003–2020. Results: We have identified 189 patients with a confirmed diagnosis of PBC; 92.6% were female and the mean age at diagnosis was 54.7 years. Thirty-nine percent were diagnosed with another autoimmune disease and 5.9% were diagnosed with a PBC-AIH (autoimmune hepatitis) variant syndrome. Ninety-six percent were treated with ursodeoxycholic acid (UDCA) at a mean dose of 13.3 mg/kg. A total of 28.1% were found with inadequate response to UDCA according to the Toronto criteria, and 53% of the UDCA non-responders were treated with bezafibrate. Younger age at diagnosis, higher baseline levels of alkaline phosphatase (ALP) and gamma-glutamyltransferase (GGT), AIH-PBC variant and positive anti-smooth muscle antibodies (ASMA) were associated with an inadequate UDCA response. In a multivariable analysis, higher ALP at diagnosis (OR = 1.92 CI 1.11–3.20 per 50-unit change, p = 0.018) and ASMA (OR = 27.6 CI 2.58–295, p = 0.006) independently predicted inadequate UDCA response. Higher alanine transaminase (ALT), ALP and GGT, lower albumin, younger age at diagnosis and pruritus conferred an increased risk for disease progression. Conclusions: Disease characteristics, treatment patterns, response to therapy and prognosis of a PBC patient cohort in a tertiary center in central Israel were revealed. The results highlight the importance of risk stratification in PBC, specifically in younger patients, those presenting with a high level of liver enzymes and in ASMA-positive patients with an assumed diagnosis of the AIH-PBC variant.

Methodological quality of cohort study on rheumatic diseases in China: A systematic review

Objective

To evaluate systematically the quality of the cohort studies on rheumatic diseases in China.

Methods

Relevant databases were searched to find cohort studies on rheumatic diseases in China, and the basic information included in the literature was extracted and analyzed. Chinese and English literature were then compared with regard to methodological quality, according to the Newcastle–Ottawa Scale (NOS).

Results

In total, we included 46 cohort studies, with 19 studies published in English and 27 studies published in Chinese. With regard to the basic characteristics of the literature, 78.26% of the studies were published in the past four years; 16 studies were associated with hyperuricemia, followed by eight studies involving systemic lupus erythematosus. The sample size of the studies in Chinese was lower than that in English studies (P< 0.05). The English literature was superior to the Chinese literature in terms of informed consent, ethical review and selection of statistical analysis methods. The methodology quality of the 46 included studies showed that the English and Chinese NOS scores were 5.59 ± 1.25 and 6.06 ± 1.11, respectively, and the difference was significant (P< 0.01). The “representativeness of the exposed group”, “demonstration that outcome of interest was not present at start of study”, and the “adequacy of follow up of cohorts” scores were relatively low in Chinese and English studies. The score for “was follow-up long enough for outcomes to occur” item in English was higher than that in the Chinese studies; however, the “study controls for the most important factor” score for Chinese papers was better than that for the English papers.

Conclusion

The Chinese rheumatic disease cohort studies started late, with a small sample size and fewer types of rheumatism. The quality of Chinese studies was better than English studies, and all reports were insufficient. In particular, “selecting exposed groups”, “controlling the outcomes before study implementation” and “adequacy of follow-up” needed improvement.

Race/Ethnicity and Insurance-Specific Disparities in In-Hospital Mortality Among Adults with Primary Biliary Cholangitis: Analysis of 2007-2014 National Inpatient Sample

BACKGROUND

Primary biliary cholangitis (PBC) is a progressive autoimmune liver disease that can result in cirrhosis and end-stage liver disease.

AIMS

We aim to evaluate hospitalization burden and in-hospital mortality among PBC patients in the USA.

METHODS

Using data from the Nationwide Inpatient Sample from 2007 to 2014, hospitalizations among US adults with PBC were stratified by sex, age, and race/ethnicity. Overall in-hospital mortality was stratified by these variables and adjusted multivariate regression models evaluated for predictors of in-hospital mortality.

RESULTS

From 2007 to 2014, there were 18,279 hospitalizations among adults with PBC (15.0% male, mean age 63.8 years, 41.3% cirrhosis). Among non-Hispanic whites, the proportion of total PBC hospitalizations increased from 57.8% in 2007 to 71.2% in 2014, compared to 4.1-6.3% for African-Americans, 8.6-10.9% for Hispanics, and 1.7-2.8% for Asians (p < 0.001 for all). While overall in-hospital mortality was low (4.2%), increasing age was associated with higher odds of in-hospital mortality (OR: 1.02, 95% CI 1.01-1.03, p < 0.001). Compared to non-Hispanic white PBC patients, higher in-hospital mortality was observed in African-American PBC patients (OR: 1.40, 95% CI 1.16-2.03, p < 0.05). Compared to patients with private/commercial insurance, significantly higher odds of in-hospital mortality were observed in patients with Medicaid insurance (OR 1.42, 95% CI 1.00-1.99, p < 0.05).

CONCLUSION

In summary, among adults with PBC hospitalized in the USA from 2007 to 2014, the overall number of hospitalizations is increasing. Significant disparities in in-hospital mortality were observed; African-Americans with PBC and Medicaid patients with PBC have disproportionately higher odds of in-hospital mortality.

Sex differences in clinical presentation and prognosis in patients with primary biliary cholangitis

Objectives: Primary biliary cholangitis (PBC) is a chronic inflammatory disease of the small intrahepatic bile ducts disproportionally affecting women. Timely diagnosis and treatment can often prevent progression to liver cirrhosis. We hypothesized PBC diagnosis in male patients is delayed and prognosis impaired. We, therefore, conducted a case-control study and compared clinical and prognostic features among male and female patients with PBC.Materials and methods: 49 male patients with PBC treated at a German tertiary care center between 2006 and 2017 were identified and compared to 98 age-matched female controls. Prospectively collected clinical/biochemical data were analyzed retrospectively. Liver biopsies were scored in a blinded fashion. Prognostic parameters were calculated using established prognostic scores (GLOBE, PBC-UKE). Statistical analysis was performed using Mann-Whitney test and Fisher´s exact test.Results: At PBC diagnosis, male patients reported significantly less PBC-associated symptoms as compared to female controls (34 versus 71%, p < .01). Compared to female patients, median time from onset of PBC-related symptoms and/or first reported elevated cholestatic biochemical parameters to PBC diagnosis was significantly increased in men (36 versus 12 months, p = .02). In addition, male patients underwent liver biopsy to establish PBC diagnosis more frequently, tended to show more advanced fibrosis and showed significantly poorer prognostic PBC score results. Hepatocellular carcinoma was only observed in male patients (n = 3).Conclusions: When compared to women, men with PBC suffer from less PBC-related symptoms, receive PBC diagnosis delayed and have a worse prognosis. Despite its rarity, the diagnosis of PBC should be considered in men with elevated cholestatic parameters.

Epidemiology and clinical course of primary biliary cholangitis in the Asia-Pacific region: a systematic review and meta-analysis

AIMS

Epidemiological studies on primary biliary cholangitis (PBC) show heterogeneity. The aim of the present study was to synthesize the prevalence, incidence and clinical course of PBC in the Asia-Pacific region.

METHODS

PubMed, Medline, Cochrane library and EMBASE were searched for epidemiology and clinical course of PBC published up to July, 2019. Meta-analysis was conducted on the epidemiology and clinical course (decompensation, hepatocellular carcinoma and death/liver transplantation) of PBC patients. Random-effect model and fixed-effect model were used to evaluate the pooled prevalence, incidence, mortality/liver transplantation and their 95% confidence intervals as appropriate. Subgroup analysis was performed by stratification with gender, pre- and post-UDCA era, sub-region and publication year. Meta-regression was used to examine the heterogeneity.

RESULTS

Out of 3460 studies, 18 studies from 7 countries/regions were finally included. The overall prevalence of PBC was 118.75 cases per million (95% CI 49.96-187.55) in the Asia-Pacific region, with the high, medium and low prevalence being in Japan and China (191.18 cases per million), New Zealand (99.16 cases per million) and South Korea and Australia (39.09 cases per million), respectively. The incidence of PBC was 8.55 cases per million per year (95% CI 8.05-9.06). The 5-year accumulative incidence of decompensation, HCC and death/liver transplantation in PBC patients was 6.95% (95% CI 2.07-11.83%), 1.54% (95% CI 0.9-2.19%) and 4.02% (95% CI 2.49-5.54%), respectively.

CONCLUSION

In the Asia-Pacific region, the prevalence and incidence of PBC are higher than once expected. PBC tends to be diagnosed at older age and has a relatively low incidence of HCC in this region.

Prognosis of 732 ursodeoxycholic acid-treated patients with primary biliary cholangitis: A single center follow-up study from China

BACKGROUND AND AIM

The impact of male sex and past hepatitis B virus (HBV) infection on survival of primary biliary cholangitis (PBC) are issues at discussion. The aim of the present study was to identify risk factors for transplant-free survival (TRS) in Chinese PBC patients who received ursodeoxycholic acid (UDCA), with special focus on the impact of male sex and past HBV infection.

METHODS

We followed up PBC patients who received UDCA at our institute between January 2000 and December 2017 until their death, liver transplantation, or censored on April 1, 2018, by interview and review of medical records. We used Cox proportional hazards model and Kaplan-Meier method.

RESULTS

Out of 976 PBC patients, 732 UDCA-treated patients (female : male = 6.2:1) with required clinical and laboratory data were enrolled in this study. The median follow-up period were 4.8 years (interquartile range: 2.8-7.1 years). The overall 5-, 10-, and 15-year TRS rates were 86.7% (95% CI: 83.8-88.1), 71.1% (95% CI: 65.0-77.2), and 59.2% (95% CI: 44.5-73.9), respectively. The survival was significantly worse for male patients and older patients (≥ 55 years) (log-rank test: P < 0.05 for both). On multivariate analysis, male sex, cirrhosis, serum bilirubin, and serum albumin were independent predictors for TRS. There was no significant difference in survivals between patients with (n = 167) and without (n = 219) past HBV infection (log-rank test: P = 0.293).

CONCLUSIONS

In this large Chinese cohort of UDCA-treated PBC patients, male sex was associated with shorter survival, whereas past HBV infection was not associated with poorer outcome.

Concomitant Sjögren's Syndrome Was Not Associated with a Poorer Response or Outcomes in Ursodeoxycholic Acid-Treated Patients with Primary Biliary Cholangitis

AIM

Patients with primary biliary cholangitis (PBC) have at least 60% probability of having an autoimmune extrahepatic condition, with the most common being Sjögren's syndrome (SS). The impacts of SS on the response and outcomes in ursodeoxycholic acid (UDCA)-treated patients with PBC, however, remain unclear. The aim of this study was to document the biochemical responses and clinical outcomes of UDCA-treated patients with concomitant SS and to compare the findings to those of patients with PBC alone.

METHODS

Data from consecutive patients with PBC who visited West China Hospital affiliated with Sichuan University between October 2013 and October 2017 were reviewed retrospectively.

RESULTS

The study populations consisted of 226 patients with PBC alone and 56 with PBC/SS. The median ages, proportions of female patients, Fib-4 scores, and aspartate aminotransferase (AST)/platelet ratio index (APRI) at baseline in the two cohorts were similar. At presentation, patients with PBC/SS had higher serum IgG levels and positive rates for serum antinuclear antibody (ANA) than patients with PBC alone (all P < 0.05). There was no statistically significant difference between the rate of biochemical response to UDCA at 1 year in the PBC/SS and PBC alone groups. The UK-PBC risk scores and GLOBE scores in UDCA-treated patients in the two cohorts were also similar. During the follow-up period, the differences in the liver enzyme levels, Fib-4 scores, APRI, and incidence of liver-related adverse events were not significant.

CONCLUSIONS

The results of this retrospective, single-center study suggest that the response and clinical outcomes of UDCA-treated patients with PBC are not adversely affected by concomitant SS.

The extrahepatic events of Asian patients with primary biliary cholangitis: A 30-year cohort study

The extrahepatic complications of primary biliary cholangitis (PBC) in Asian patients remain elusive. A 30-year cohort study of 150 Taiwanese PBC patients treated with ursodeoxycholic acid (UDCA) was conducted. Patients with alkaline phosphatase levels >1.67 × ULN after 1-year treatment were considered suboptimal responders. At baseline, of 150 patients (mean age: 53.75 years), 128 (85.3%) were females, and 34 (22.8%) had cirrhosis. The cumulative incidences of various incident events were all-cause mortality or liver transplantation: 46.7%; extrahepatic mortality: 24.5%; extrahepatic malignancies: 8.1%; hypertension: 46.2%; dyslipidemia: 44.1%; diabetes: 30.6%; hyperuricemia: 11.2%; acute coronary syndrome: 3.1%; cerebral vascular accident (CVA): 8.9%; autoimmune diseases: 16%; and osteoporosis: 20.9%. The 5- to 20-year cumulative incidences for all-cause mortality or liver transplantation and extrahepatic mortality were 16.2–41.3% and 3.1–11.9%, respectively. Baseline associations were age and alpha-fetoprotein levels with extrahepatic mortality, 80% due to sepsis; age with extrahepatic malignancies and hypertension; gender and hyperuricemia with CVA; and UDCA response with autoimmune disease. Conclusions: Sepsis accounted for most extrahepatic mortality in PBC patients, and the longer the follow-up was, the higher the extrahepatic/all-cause mortality ratio. Baseline age is crucial for incident extrahepatic events and only CVA shows gender-dimorphism; the association between UDCA response and autoimmune disease requires further investigation.