Sixty patients with non-Hodgkin's lymphomas were treated with a cyclophosphamide, vincristine, and prednisone (CVP) induction regimen, either alone (stage IV) or in combination with radiotherapy (stages I, II, III). The response rates for lymphocytic and histiocytic lymphomas were 82 and 86%. The complete remission (CR) rates were 66 and 71% with a median duration of 13 and 5.5 months respectively. Nodular types responded better than diffuse ones in both lymphocytic (CR rate 85% vs 45%; median duration 24+ months vs 2.5 months) and histiocytic lymphoma (CR rate 100% vs 0%). In lymphocytic lymphomas, survival in the responder group was 90% at 24 months vs only 20% in the nonresponder group (median survival 14.2 months). In the group with nodular lymphocytic lymphoma responding to therapy, there was a 100% survival rate at 24 months. The median survival for patients treated with chemotherapy alone (stage IV) and not responding to therapy, was 22 months vs 14.5 months in the whole nonresponder group (stages I, II, III, IV), suggesting a detremental effect of rediotherapy in the nonresponder group. In histiocytic lymphomas, the median survivals in the responder and nonresponder groups were 19 months and 3 months respectively. These results corroborate the excellent efficacy of the CVP regimen. They also indicate that, after CVP induction, 2 major prognostic factors are the histologic type and the nature of the response to therapy.