Arab Journal of Gastroenterology
www.arabjg.eg.net 38
Review Article Management of Chronic Hepatitic C Virus Genotype 4 Infection
Gamal Esmat, Maissa El Raziky
Tropical Medicine Department, Faculty of Medicine, Cairo University, Cairo, Egypt
Key Words Chronic hepatitis C, epidemiology, screening, diagnosis, therapy
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Corresponding Author
http://www.arabjg.eg.net/2007_part2/article_no.1.pdfGamal Esmat, MD, Tropical Medicine Department, Faculty of Medicine, Cairo University, Cairo, Egypt,
Tel.: 202236847524, Fax: 20223682774, E-mail:
gesmat@gamalesmat.comInTRoDuCTIon Hepatitis C virus (HCV) accounts for a sizable proportion of cases of chronic liver disease, liver disease deaths and cases
of hepatocellular carcinoma and represents the most common indication for liver transplantation (LTx). Projections based on the
current prevalence of infection and anticipated rates of progression suggest that the morbidity and mortality as well as the medical care
costs attributable to HCV infection will escalate alarmingly during the next two decades1.Six major genotypes1–6 and more than 50 subtypes of HCV have been described2. In general, HCV genotype 4 (HCV4) is predominant in Africa and the Middle East 3. In Egypt, where hepatitis C is highly endemic (up to 15% of the population), 91% of the patients were infected with HCV44.Many studies confrm that HCV4 is the predominant HCV genotype in Saudi Arabia5,6 and Kuwait7. Small studies from Africa suggest that HCV4 is the predominant genotype on that continent8,9. Although HCV4 represents 1–3% of the hepatitis C infections in Western countries, some studies report an unexplainably more prevalent HCV4 in some European countries as in Southern Spain10, Southern Italy11 and France12. Most HCV4 patients in these studies were intravenous drug abusers.SCREEnInG Hepatitis C has many characteristics that render it potentially suitable for screening. In fact, it causes signifcant morbidity, high risk groups are identifable as a target population and the screening test is effcient. The testing strategy utilizes the antibody test which has excellent specifcity and sensitivity, if we exclude some false negative cases in acute infections and in the immunocompromised state. In these situations the diagnosis can be made with HCV RNA by using amplifcation techniques. For the majority of patients, the usual approach is to test them initially for the antibody and then to use HCV RNA to detect viraemia13. But problems arise in the defnition of the target population. In fact, generalized population screening is not endorsed by international guidelines, although some recommend screening population of high prevalence countries. Opportunistic screening (case fnding) of individuals with classic risk factors, such as transfusion before 1992 and drug addiction, is the most frequently used strategy14. Arguments against population screening are that nearly half of the detected patients will have normal alanine aminotransferase (ALT) and a slowly progressing disease15, that many patients will harbor conditions contraindicating antiviral treatment and that many persons with mild disease will have deterioration in their quality of life after knowing the result of the test16
. These drawbacks limit the effectiveness of a mass screening program and render it not cost effective14. The optimal method to detect HCV infection, according to all international guidelines, is therefore to screen individuals with identifable risk factors: Intravenous drug use (past and present), populations with high HCV prevalence, injections with reusable glass syringes, blood transfusion or organ transplantation before 1992 (or by known HCV positive donor), administration of clotting factors before 1997, hepatitis B virus infection, clinical or biochemical evidence for chronic liver disease, percutaneous exposures to HCV, history of sexually transmitted disease, history of invasive procedures or haemophilia, children born to HCV positive mothers, health care workers performing procedures at risk of transmission to the patient and stable sexual partners of HCV positive patients17-21. Multiple large community-based studies from Egypt have shown a strong association between a history of receiving parenteral antischistosomal therapy (in the 1960s and 1970s) and the prevalence of anti-HCV antibody (anti-HCV)22–24. Rao et al. reported that among Egyptians residing in the Nile delta region, the prevalence of HCV was 38% in patients who reported no history of schistosomiasis and 68% in individuals with a history of parenteral antischistosomiasis treatment (P <0.0001)23. Many publications suggest that parenteral antischistosomiasis treatment had a major role in the spread of HCV throughout Egypt. This intensive transmission established a large reservoir of chronic HCV infection, responsible for the high prevalence of HCV infection and current high rates of transmission. Egypt’s mass campaigns of
parenteral antischistosomiasis treatment may represent the world’s largest iatrogenic transmission of blood-borne pathogens24.
Arab J Gastroenterol 2007; 8(2): 38-43ISSN 1687-1979G. Esmat and M. El Raziky- Management of Chronic HCV Genotype 4 39 PRETREATMEnT DIAGnoSTIC EVALuATIon Pretreatment diagnostic consideration Seropositive persons for anti-HCV in the presence of HCV RNA and compensated liver disease are considered as potential candidates for antiviral therapy21 . Currently, antiviral therapy is not recommended for patients with decompensated liver cirrhosis or history of severe uncontrolled psychiatric disorder17 . Patients with marked leucopoenia or thrombocytopoenia may not tolerate interferon (IFN) and patients with marked anaemia, cardiovascular or cerebrovascular disease, or renal failure may not tolerate ribavirin, which causes dose-dependent haemolytic anaemia22 . Testing for ALT and aspartate aminotransferase (AST) levels is an important component of the diagnostic evaluation in patients with chronic HCV, although elevation of ALT and AST levels is not a requirement for therapy21 . Virologic tests for monitoring therapy Quantitative testing for HCV RNA with an amplifcation assay provides both a baseline level to monitor virologic response and a prognostic indicator of the likelihood of response. Patients with very high levels of HCV RNA respond less well to antiviral therapy than do those with lower levels. These assays are valuable for demonstration of early virologic response (EVR) that is a 2-log 10 reduction in HCV RNA levels within 12 weeks of initiating therapy21 . Genotyping Although the genotype is a strong predictor of response to therapy and can affect the duration, however in a country like Egypt, where more than 90% of HCV cases are of genotype 44 , genotyping may be revaluated for its cost-effectiveness. Patients with genotype 4, are intermediate in responsiveness to therapy between those of genotype 1 and genotypes 2 and 3, and are treated for a full 48 weeks with full dose ribavirin like patients with genotype 125 . Liver biopsy Despite its complications and interpretation errors, liver biopsy remains the gold standard for determining histologic grade and stage to assess the current status of the liver and to provide prognostic information for future disease progression26 . In most studies, the degree of liver fbrosis is an important predictor of response to therapy. Patients with mild degree of fbrosis respond better to treatment than patients with higher fbrosis stage27 . If he biopsy specimen shows mild histologic disease, progression may be suffciently slow to justify monitoring without therapeutic intervention17 . Steatosis has been shown to be a negative predictor of response to antiviral therapy28 . Persistently normal serum ALT As patients with persistently normal ALT levels generally do not progress histologically, they are candidates for antiviral therapy or for monitoring without intervention as determined on an individual basis and is infuenced by patient’s factors such as motivation, histologic activity and fbrosis20 . Counseling to avoid transmission of HCV
HCV infection after liver transplantation
In patients with chronic HCV who are candidates for transplantation, recurrent infection of the allograft is universal following transplantation and probably occurs at the time of reperfusion.
Viraemia starts to rise from day 7 and most patients will develop acute HCV4-12 weeks post-transplant. Following transplant, pre-emptive treatment (<6 months) post transplant is only within
clinical trials. Treatment of established reccurrence ( >6 months) should be considered in severe disease, the preferred regimen is at least 48 weeks PEG-IFN plus ribavirin. Over-immunosuppression
should be avoided in the early post-transplant period and rapid steroid withdrawal in the later post-transplant period48.
Liver transplantation for HCV induced cirrhosis The outcome of patients transplanted for HCV is variable. HCV cirrhosis whether alone or mixed with schistosomiasis was the main indication for LTx. A 77.6% survival after a median follow up
period of 4.6 years was reported49.
ConCLuSIon The natural history of HCV4 seems to be generally similar to other HCV genotypes, but the suggestion that it is associated with a worse prognosis after liver transplantation is questionable. Regular IFN monotherapy results are poor (in the range of 10-15%). Non-pegylated IFN plus ribavirin combination therapy showed variable results, but approximately 35-40% of patients achieve SVR after 48 weeks of treatment. The use of PEG-IFN combination therapies should result in improved response rates, ranging from 40% to 70%. Thus PEG-IFN, higher doses of ribavirin and a 48 weeks duration of therapy give the patient the best chance for a higher SVR.
ACKnoWLEDGMEnTS The authors acknowledge the efforts of Dr. Naglaa Zayed, lecturer of Tropical Medicine Department, Cairo University and Dr. Mohammed El Kassas, tropical medicine specialist at TMRI, for
their help in preparing this review.
Competing interests: None
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