1916766 CHOP-R cyclophosphamide, doxorubicin, vincristine, prednisone, and rituximab 9 1916763 CHOP-R CHOP plus rituximab 4 1916761 CHOP-R CHOP-rituximab 2 1916765 CHOP-R cyclophosphamide, Adriamycin, vincristine, and prednisone 2 1916767 CHOP-R chemoimmunotherapy 1 1916768 CHOP-R chemotherapy at 3-week intervals with six doses of rituximab 1 1916764 CHOP-R chemotherapy with rituximab 1 1916759 CHOP-R CHOP (cyclo-phosphamide/doxorubicin/vincristine/prednisone) followed by rituximab 1 1916762 CHOP-R CHOP followed by rituximab 1 1916760 CHOP-R CHOP with the addition of rituximab 1 1916758 CHOP-R cyclophosphamide-hydroxyldaunorubicin-oncovin-prednisone-rituximab 1 1916757 CHOP-R rituximab-cyclophosphamide-hydroxydaunorubicin-Oncovin-prednisone 1