Patients with classical Hodgkin's lymphoma are assigned to 1 of 2 randomized groups. (Group 2 [unfavorable prognosis] closed to accrual as of 9/2002.) (Group 1 [favorable prognosis] closed to accrual as of 4/28/04.) Patients with lymphocyte-predominant Hodgkin's lymphoma are assigned to the nonrandomized group.