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Hepatitis C virus (HCV) infection is frequent among HIV-infected patients. We describe, the characteristics of 6 HIV/HCV-coinfected patients with B-cell non–Hodgkin lymphoma (NHL) included in a prospective cohort study of HIV-related lymphomas. Five of the 6 cases had features of marginal zone/lymphoplasmacytic NHL versus 1 of 33 HIV only–infected patients. Remarkably, anti-HCV treatment led to a hematological response in a patient with splenic marginal zone lymphoma. This supports the role of chronic antigenic stimulation by HCV on lymphomagenesis and further evaluation of HCV antiviral therapy in coinfected patients with NHL.