In a prospective randomized trial, 225 patients with stage IIB nonseminomatous testis tumor after radical retroperitoneal lymph node dissection received 2 versus 4 courses (arms 1 and 2, respectively) of adjuvant chemotherapy with cis-platinum, vinblastine and bleomycin. With a median followup of 43 months, a total of 7 relapses occurred; 6 in arm 1 and 1 in arm 2. Three patients died: 2 during adjuvant chemotherapy and 1 of progressive disease. The difference in relapse rates between arms 1 and 2 is not statistically significant. Patient compliance differed: chemotherapy was administered according to protocol in 83% and 50% of the cases in arms 1 and 2, respectively. Most frequent side effects observed were nausea, vomiting and alopecia. No significant differences regarding these or other side effects were obtained. Patients with stage IIB nonseminomatous testis tumor after retroperitoneal lymph node dissection are treated sufficiently with 2 courses of adjuvant cis-platinum-containing chemotherapy.