Patients with stage I or II non-Hodgkin's lymphoma (NHL), no baseline lactate dehydrogenase (LDH) elevation, baseline WHO performance status 0-1, and longest tumor diameter of less than 5 cm, who achieve partial response (PR) or complete response (CR), receive 1 additional course of chemotherapy. Patients then undergo involved-field radiotherapy once daily 5 days a week for 3.5-4 weeks.