Two hundred forty-seven patients with disseminated Hodgkin disease were randomly treated with one of three intensive multiple-agent regimens. Partial or complete response rates of 90% were obtained with each routine. The "MOPP" regimen—mechlorethamine hydrochloride, vincristine sulfate (Oncovin), procarbazine hydrochloride, and prednisone—yielded the longest duration of response but also had the highest toxicity. There was no difference in survival rates among patients on the three routines. Major factors associated with good response were female sex and little or no prior therapy. Minor favorable factors were stage III disease, lack of systemic symptoms, former responsiveness to therapy, and age of less than 60 years. The simultaneous dosage routine was superior in both response rate and lessened toxicity compared to sequential usage of the same drugs with the same total dosage.