Based on the need to improve front-line therapy for patients less likely to undergo transplant, the promising recent in vitro and clinical work on melphalan and bortezomib, we propose a prospective trial with bortezomib added to standard melphalan and prednisone therapy for previously untreated patients with multiple myeloma. Bortezomib 1.3 mg/m2 will be given twice weekly for two weeks and will be added to standard melphalan and prednisone on a 4-week cycle. This three-drug combination will be compared to historical data. We have treated 2 patients with relapsed disease following >2 prior regimens including high-dose therapy with autologous stem cell support. Each patient received melphalan, prednisone, and bortezomib as described below and both had marked declines in M-protein within 2 cycles. These responses have been sustained for at least 3 months and treatment was well tolerated.