This study is a multicentric randomized trial evaluating the efficacy and safety of R-CHOP given every 14 days compared to R-CHOP given every 21 days in association or not with darbepoetin alfa in order to maintain hemoglobin above 13 g/dl, compared to classical symptomatic treatment of anemia in patients aged from 60 to 80 years with diffuse large B-cell lymphoma.