OUTLINE: Patients receive doxorubicin hydrochloride IV, vinblastine IV, bleomycin IV, and dacarbazine IV (ABVD) on days 1 and 15 of all courses. Patients also receive rituximab IV on days -6, 1, 8, 15, and 22 of ABVD course 1 and on day 1 only of ABVD courses 2, 4, and 6. Treatment repeats every 28 days for 6-8 courses in the absence of disease progression or unacceptable toxicity.