Ethnic epidemiological profiles and antiviral therapy among patients infected with hepatitis C virus genotype 4 : a multicenter study from Belgium

Background : Hepatitis C virus genotype 4 (HCV-4) is the most prevalent genotype in Central Africa. Aim : To compare epidemiology, clinical characteristics and any differences in access to HCV therapy in two populations of HCV-4 patients residing in Belgium. Methods : This multicenter study selected 473 HCV-4 patients from seven hospital databases and compared them according to ethnic origin, i.e., Black African (n = 331) or not (n = 142), for epi- demiological, clinical, biological and histological characteristics. Interleukin 28B polymorphism (CC-genotype) was evaluated in a second cohort of 69 Black African and 30 non-Black African pa- tients. Results : Compared to other patients, the Black African patients were more likely to be female and were older, commonly over- weight, frequently had abnormal glucose metabolism and arterial hypertension ; they were less likely to have dyslipidemia, a history of alcohol consumption or ALT elevation. The route of infection was more frequently unknown in Black African than in other pa- tients. Black African patients had more HCV-4 subtypes, were less frequently of IL28B CC-genotype and had less severe liver fibrosis. The proportion of patients who received antiviral treatment was similar in the two groups. Conclusion : In this Belgian cohort, patients with HCV-4 infec- tion were more frequently of Black African origin than of other origin. Infected Black African patients were more commonly female, older at diagnosis, and had more co-morbidities than other patients ; they also had less advanced liver fibrosis than infected non-Black African patients and fewer had a CC genotype. (Acta gastroenterol. belg., 2015, 78, 365-372).