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Interferon-free cure of chronic Hepatitis C is associated with weight gain during long-term follow-up.

Background and aim  The advent of direct-acting antivirals has revolutionized treatment of chronic hepatitis C with very high cure rates and excellent tolerability compared to interferon-based hepatitis C virus (HCV) treatment. However, long-term effects of interferon-free cure of HCV infection on the metabolic condition of patients have not been investigated so far. Methods  We investigated weight development during and after antiviral treatment of hepatitis C. In a prospective single-center cohort study, interferon-free antiviral treatment was initiated in 284 patients. Each patient's weight was monitored 1 year before the start of treatment, at baseline (BL), end of treatment (EOT), follow-up week 24 (FU24), and follow-up week 48 (FU48). Results  Weight gain after HCV cure was observed in 20 %, 33 %, and 44 % of patients at EOT, FU24, and FU48, respectively. The mean overall weight change at FU48 compared to baseline was 1.45 kg (95 % CI 0.44; 2.46, p = 0.02, compared to the pretreatment period). Multivariate regression revealed age as the only factor predicting weight change at FU48 (B - 0.107, 95 % CI, - 0.202 to - 0.011, p = 0.03), while gender, cirrhosis, diabetes mellitus, ribavirin, and body mass index had no influence. In the subgroup of patients younger than 60 years, mean weight gain at FU48 compared to baseline was 2.8 kg (95 % CI, 1.23 - 4.4). In contrast, patients 60 years and older had a mean weight change of - 0.04 kg (95 % CI, - 1.12 to 1.03, p = 0.005). Conclusions  Cure of HCV by interferon-free antiviral treatment was associated with weight gain in up to 44 % of patients during long-term follow-up. Weight gain occurred predominantly in patients younger than 60 years. The precise mechanism of weight gain remains to be elucidated.

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