[Hepatitis B virus reactivation in rituximab-treated patients: incidence and risk factors].

Hepatitis B virus (HBV) reactivation after chemotherapy regimens is a well-known complication. The incidence and risk factors for HBV reactivation remain to be elucidated. We aimed to determine the incidence and risk factors for HBV reactivation in patients receiving rituximab, and the potential role of the cumulative rituximab dose in HBV reactivation. We retrospectively reviewed 320 patients receiving rituximab in our hospital. Of these, 42 (13.12%) had serological markers of hepatitis B. During follow-up, 21% (9/42) had HBV reactivation. Risk factors for reactivation were HBsAg positivity (p < 0.05), isolated anti-HBc positivity (p < 0.05), marginal zone lymphoma, and Mantle cell lymphoma (p < 0.05). The median rituximab dose tended to be higher in patients with reactivation (p = 0.06).