Abbreviations: DRC, dexamethasone, rituximab, and cyclophosphamide; FN, febrile neutropenia; G, grade; M, median; NA, not applicable; ORR, overall response rate; PFS, progression-free survival; PN, peripheral neuropathy; R-CHOP, rituximab, cyclophosphamide, hydroxy-doxorubicin, vincristine, and prednisone; Ref No., reference number; TTF, time to treatment failure; TTP, time to progression.