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Alpha-2-interferon/melphalan/prednisone in previously untreated patients with multiple myeloma: a phase I-II trial.Cooper, M R; Fefer, A; Thompson, J; Case, D C; Kempf, R; Sacher, R; Neefe, J; Bickers, J; Scarffe, J Howard; Spiegel, R (1986-04)Alpha-2-interferon (IFN) has demonstrable activity in advanced, relapsing, or refractory multiple myeloma. Because of the in vitro synergism between the IFNs and cytotoxic agents, we conducted a trial of 30 previously untreated patients with multiple myeloma utilizing various doses of alpha-2-IFN in combination with standard oral doses of melphalan and prednisone. The combination was well-tolerated without unusual or unexpected toxic effects. The limiting toxicity included dose-related myelosuppression, and alpha-2-IFN induced flu-like symptoms and fatigue. Response was seen in at least as many patients as would be expected with melphalan and prednisone alone. The maximal tolerated dose for a phase II-III trial was 5.0 X 10(6) IU/m2 of alpha-2-IFN in combination with standard doses of melphalan and prednisone. Future trials should utilize this dose of alpha-2-IFN with dose de-escalation according to tolerance.