A therapeutic regimen (MOPP) that consisted of a combination of mechlorethamine hydrochloride, 3 to 6 mg/sq m intravenously, days 1 and 8, vincristine sulfate, 0.7 or 1.4 mg/sq m intravenously, days 1 and 8, procarbazine hydrochloride, 50 or 100 mg/sq m orally, every day for ten days, and prednisone, 40 mg/sq m orally, every day for ten days, was given every four weeks for 24 weeks to 164 patients with disseminated Hodgkin's disease. Patients in complete remission then received either no therapy or MOPP therapy every eight weeks. One hundred six patients achieved a complete remission (65%). The remission rate for stages IIIA, IIIB, and IVA ranged between 78% and