The purpose of this prospective phase II trial was to investigate the safety and efficacy of a modified baseline BEACOPP (bleomycin, etoposide, adriamycin, cyclophosphamide, vincristine, procarbazine, and prednisone) regimen in the treatment of intermediate and advanced stage Hodgkin's disease (HD). From October 1997 to November 2001, 51 consecutive, previously untreated patients with stage IIA (bulky), IIB, III, and IV disease were treated with a modified baseline BEACOPP regimen with the etoposide administered i.v. on day 1 and orally at a dose of 100 mg/m2, on days 2 and 3. Each patient was scheduled to receive eight courses of BEACOPP with consolidation radiotherapy to bulky (> or =5 cm) or residual disease. There were 25 males and 26 females with a median age of 32 yr (16-65 yr); 80.3% of the patients had nodular sclerosis HD, 41% had bulky disease (> or =5 cm), 10 were in stage IIA (bulky > or =10 cm), 15 in stage IIB, 19 in stage III, and seven in stage IV. Thirty-seven patients (72.5%) achieved a complete response and 17.6% partial response. No significant difference in overall response rate was observed between patients with: (i) 0-2 vs. > or =3 negative prognostic factors, (ii) in stage II vs. stages III/IV, LDH level, and bulky disease. With a median follow up period of 39.5 months, actuarial 3-yr survival rate is 82% and time to progression rate 72.5%. Treatment with this combination was well tolerated. Grades 3 and 4 leukopenia and neutropenia occured in 26% and 28% of the patients, respectively, whereas in 16.3% of the patients infection was observed. Support with granulocyte colony-stimulating factor was given to 59% of the patients. No case of secondary MDS/leukemia has been observed. The results of the present study demonstrate that the modified baseline BEACOPP regimen with radiotherapy used in our patients was well tolerated and effective therapy for intermediate and advanced stage HD. Further follow up time is required to evaluate long-term toxicity.