In the present study, we investigated whether polymorphisms in DNA repair genes or MDR1 are associated with risk for 694 NHL and 378 diffuse large B-cell lymphoma (DLBCL) and 140 T-cell lymphoma subtype, by analyzing 15 polymorphisms in 12 genes (Table 1). This evidence concerns the gene ABCB1 and diffuse large B-cell lymphoma.