- Histologically proven stage II, III, or IV intermediate-grade non-Hodgkin's lymphoma that has not responded to or has relapsed after a standard primary chemotherapy regimen plus at least 1 standard second-line salvage chemotherapy regimen NOTE: A new classification scheme for adult non-Hodgkin's lymphoma has been adopted by PDQ. The terminology of "indolent" or "aggressive" lymphoma will replace the former terminology of "low", "intermediate", or "high" grade lymphoma. However, this protocol uses the former terminology.