February 2013, Volume 63, Issue 2

Original Article

Liver histology of chronic hepatitis C patients who relapsed or not responded to conventional interferon and ribavirin therapy

Amanullah Abbasi  ( Medical Unit III, Ward-7, Jinnah Postgraduate Medical Centre, Karachi, Pakistan. )
Nazish Butt  ( Medical Unit III, Ward-7, Jinnah Postgraduate Medical Centre, Karachi, Pakistan. )
Abdul Rabb Bhutto  ( Medical Unit III, Ward-7, Jinnah Postgraduate Medical Centre, Karachi, Pakistan. )
Sayed Muhammad Munir  ( Medical Unit III, Ward-7, Jinnah Postgraduate Medical Centre, Karachi, Pakistan. )
Azizullah Khan Dhillo  ( Medical Unit III, Ward-7, Jinnah Postgraduate Medical Centre, Karachi, Pakistan. )

Introduction

Chronic hepatitis C virus (HCV) infection, including its sequelae, is an important healthcare problem in Pakistan. WHO has estimated that already about 180 million people are infected with HCV; 130 million of these are chronic HCV carriers and are at risk for developing liver cirrhosis and cancer. Every year, three to four million individuals are newly infected and 40-60 percent of them will develop chronic hepatitis.1 Anti-viral therapy is an important consideration in the management of patients with chronic HCV infection, as a sustained virologic response (SVR) to therapy may halt fibrosis progression, decrease the risk of hepatocellular carcinoma, and improve survival.2,3 Genotypes 3a and 3b are the most prevalent HCV genotypes in Pakistan and are most responsive to interferon and ribavirin combination therapy.4-6 Using conventional interferon alpha (IFN-a) 3 million units three times per week along with daily ribavirin 800-1200mg for 6 months, three randomized, controlled trials from Taiwan, Italy and Sweden were the first to show significant higher SVR 43, 47, and 40% respectively.7 Liver biopsy is the important tool to determine the response of treatment in non-responders and relapsers of IFN-a3 plus ribavirin therapy and their relation with clinical and biochemical features. The aim of the present study was to evaluate liver histology of chronic hepatitis C patients, who were non-responders or relapsers to previous conventional therapy.

Patients and Methods

Conducted at the Hepatology Section of Medical Unit-III at the Jinnah Postgraduate Medical Centre, Karahci, from January to December 2008, the study was approved by the Institution\\\'s Review Board.
A total of 109 male and female outpatients aged >17 years with serological evidence of chronic hepatitis C by an anti-HCV antibody test and quantifiable serum HCV ribonucleic (RNA), who had previously received one course of conventional interferon 3 million units thrice per week plus ribavirin 800-1200 mg daily for at least 24 weeks were considered eligible for the study. Informed written consent was taken from all study participants. All patients had a liver biopsy that showed findings consistent with a diagnosis of chronic hepatitis C infection according to the Batts-Ludwig classification. The biopsies were done by trainees under supervision of consultants after taking informed written consent.
Patients having previous course of conventional interferon monotherapy, age below 17 years, concomitant evidence of B or D virus infections, human immunodeficiency (HIV) infection, decompensated cirrhosis, alcohol or intravenous drug abuse, pregnancy, malignancy and autoimmune disease were not included. SPSS 15 was used to analyse data. Mean ± standard deviation was calculated for quantitative variables.

Results

Of the 109 patients, 57 (52.3%) were women and 52 (47.7%) were men. Mean age was 38.9±8.8 years (Table-1).

Among these, 100 (91.7%) patients had never achieved undetectable HCV RNA (qualitative polymerase chain reaction [PCR] testing) during the first treatment, and were, thus, non-responders, while 9 (8.3%) patients had shown undetectable HCV RNA during the therapy, but had become HCV RNA positive after discontinuing medication and were, thus, relapsers. Genotype 1 was seen in 29 (26.6%) patients and Genotype 3 in 78 (71.6%). Genotype of 2 patients was missing. Grade 1 inflammation were present in 51 (46.8%) patients; grade 2 in 47 (43.1%); grade 3 in 10 (9.2%); and grade 4 in 1(0.9%). Stage 0 fibrosis was present in 10 (9.2%) patients; stage 1 in 34 (31.2%); stage 2 in 36 (33.0%); stage 3 in 13 (11.9%); and stage 4 in 16 (14.7%) (Table-2).

Discussion

Chronic hepatitis C patients who are non-responders and relapsers to conventional interferon (IFN) and ribavirin represent one of the most difficult challenges in clinical routine in Pakistan. The current standard of care for chronic hepatitis C is treatment with combination therapy of pegylated interferon (PEG-IFN) plus weight-based ribavirin, with an overall SVR rate of 70-90% in Asian patients compared with 50-80% in Caucasian patients.8,9 In developing countries like Pakistan where the burden of chronic hepatitis C is increasing day by day, it is very difficult to prescribe PEG-IFN to every patient. In Pakistani patients with chronic hepatitis C, clinical observations indicate that SVR obtained with conventional IFN and ribavirin is higher than that in studies conducted in Western countries.10
Hepatic fibrosis is a primary endpoint in the evaluation of the severity of chronic liver disease. Liver biopsy remains the gold standard for assessment of hepatic fibrosis.11
In the current study, HCV infection was higher among women. The mean age of the non-responders was 39.19±8.9 years and relapsers 35.89±8.3 years, which is a very productive part of life.
Most of the patients were non-responders to conventional IFN therapy, and only 8.3% of the patients were relapsers. The most common HCV genotype in both the relapsers and the non-responders was Genotype 3 followed by Genotype 1. Shin et al. reported in a cohort of Korean chronic hepatitis C (CHC) patients that risk factors for relapse were age older than 50 years, Genotype 1 cases, higher baseline HCV RNA level, while lower adherence to treatment was important in Genotype 2 and 3 patients.12 Older age was not the risk factor in our patients. Treatment responses to antiviral therapy with IFN plus ribavirin have been shown to be influenced by the genotype, and the SVR is higher for patients with HCV Genotype 2 or 3 than for those with HCV Genotype 1.13 Majority of the non-responders and relapsers in our study had HCV Genotype 3, which reflects the most common HCV genotype in Pakistan.14 Aminotransferase levels were high in the non-responders compared to the relapsers. Basso et al. indicated that alanine aminotransferase (ALT) elevation in the later course of antiviral therapy of HCV RNA negative patients was associated with virologic relapse.15 In this study both mean ALT and aspartate aminotransferase (AST) levels were elevated in the non-responders compared to the relapsers.
The current study had limitations as baseline liver biopsy was not done, baseline HCV RNA levels were not checked and, on treatment, virological responses were not available.

Conclusion

Even if not eradicating HCV, conventional anti-viral therapy is able to halt the progress of necroinflammation and fibrosis, and, hence, hepatocellular carcinoma. Although the number of patients in the study was very low; but stage IV fibrosis was not seen in the relapsers and they also had less degree of inflammation that might be the histological response with conventional interferon and ribavirin therapy. Further studies are required to establish this relationship with certainty.

Acknowledgement

Funding for the treatment was provided by the \\\'Pakistan Bait-ul-Mal.

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