Hepatitis C virus (HCV), which is both a hepatotropic and a lymphotrop
ic virus, has been proposed as a possible causative agent of mixed cry
oglobulinaemia. This 'benign' lymphoproliferative disorder can switch
over to a malignant B-cell non-Hodgkin's lymphoma (NHL). Therefore HCV
infection has been investigated in a series of 50 unselected Italian
patients with B-cell NHL. Antibodies against HCV were found in 30% of
NHL and HCV viraemia in 32% of cases. HCV-related markers were detecte
d in 34% (17/50) of our NHL patients; this prevalence is particularly
significant when compared with HCV seropositivity in Hodgkin's lymphom
a (3%) and healthy controls (1.3%).