A phase II study of carboplatin for malignant lymphoma was conducted. Thirty-nine patients with malignant lymphoma were entered into this study, and 6 of them were excluded from evaluation due to violation of selection criteria. The remaining 33 cases were studied to assess the effectiveness and safety of this drug. Two CR and 11 PR were obtained with this medication (effective rate 39%). The significant affecting factors were previous treatment, disease stage and P.S. score. Many cases suffered from gastrointestinal symptoms and reduced hematopoiesis. The former complication was self-limited without any fatal episodes. However, the latter included severe cases, especially thrombocytopenia, which is suggested to be a dose limiting factor (DLF) of this drug.