The primary objective of this study is to evaluate the efficacy of doxorubicin, cyclophosphamide, vindesine, bleomycin, and prednisone (ACVBP) plus rituximab in comparison to cyclophosphamide, doxorubicin, vincristine, prednisone (CHOP) plus rituximab in patients aged from 60 to 65 years with non-previously treated diffuse large B-cell lymphoma as measured by the event-free survival. The goal is to obtain a 10% increase of event-free survival at 3 years.