Fifty consecutive patients with advanced Hodgkin's disease were treated in a multicentre study with 6 cycles of an alternating scheme of MOPP and CAVmP followed by irradiation to a dose of 20 Gy. The objective was to increase complete remission (CR) and cure rates by alternating two effective noncross-resistant regimens with subsequent consolidation of the remission by irradiating bulky nodes. A total of 47 patients completed the treatment and are evaluable. In the first 13 patients the irradiation fields amounted to a total or subtotal nodal irradiation with inclusion of the spleen. In case of organ involvement the affected organ was also included in the irradiation field. The irradiation protocol was later changed to an irradiation of the initially involved sites because of severe leucopenia and thrombopenia. After completion of the chemotherapy 32 (68%) patients (for Stage IIIB and IV patients: 63% and 71%, respectively) achieved a CR, after ending the radiotherapy the percentage of CR increased to 87% (for stage IIIB and IV patients: 90% and 86%, respectively). Five of the patients relapsed in an irradiated and nonirradiated area, three patients in a nonirradiated field. The actuarial 3-year survival rate for the entire group was 86% and for patients in CR 94%. The relapse-free survival was 73%. It is concluded that this alternating chemotherapy scheme followed by irradiation is at least equally effective as MOPP treatment in achieving a CR, and is probably superior in terms of survival.