Bone marrow is again examined on day 29. Patients with M0 or M1 cellularity after course I and no sign of relapse after course II proceed to course III. Patients with M2 or M3 cellularity after course I must have M0 or M1 cellularity after course II to proceed to course III. Patients with M2 or M3 cellularity after course II are removed from study.