Role of a doxorubicin-containing regimen in relapsed and resistant lymphomas: An 8-year follow-up study of EPOCH

Purpose: Curative up-front regimens for non-Hodgkin's lymphomas contain doxorabicin, vincristine, and cyclophosphamide, whereas salvage regimens generally contain non-crass-resistant agents. We hypothesized that up-front agents may be highly effective for salvage and developed an infusional regimen based on in vitro evidence of increased efficacy. Patients and Methods: A prospective phase II study of etoposide, vincristine, and doxorubicin over 96 hours with bolus cyclophosphamide and oral prednisone (EPOCH) was performed in 131 patient's with relapsed or resistant lymphoma. Results: Seventy-nine percent of patients had aggressive histologies, 46% were considered high risk by the international Prognostic Index, and 34% had resistant disease. Eighty-eight percent of patients had received at least four of the agents in EPOCH, and 94% had received doxorubicino In 125 assessable patients, 29 (24%) achieved complete responses and 60 (50%) achieved partial responses. Among 42 patients with resistant disease, 57% responded, and in 28 patients with relapsed aggressive de nova lymphomas, 89% responded with 54% complete responses. With a median follow-up of 76 months, the overall and event-free survivals (EFS) were 17.5 and 7 months, respectively. In 33 patients with sensitive aggressive disease who did not receive stem-cell transplantation, EFS was 19% at 36 months. Toxicity was primarily hematologic, with an 18% incidence of febrile neutrepenia. No clinically significant cardiac toxicity was observed, despite no maximum cumulative doxorabicin dose. Conclusion: EPOCH is highly effective in patients who had previously received most/all of the same drugs and produces durable remissions in curable sub-types. Salvage regimens need not contain non-cross-resistant agents, and infusional schedules may partially reverse drug resistance and reduce toxicity. (C) 2000 by American Society of Clinical Oncology.