Bendamustine, Wkly Bortezomib, Lenalidomide and Dexamethasone for Multiple Myeloma

The first group of three patients to enter the study will receive a 25 mg/m\^2 dose of bendamustine. If this dose is found to be safe, the next three patients will receive 50 mg/m\^2. Using a modified Fibonacci dose-escalation design, the dose will continue to increase at a rate of 25 mg/m\^2 until the highest safe dose of bendamustine is found. The maximum dose will be 125 mg/m\^2. Bendamustine and bortezomib will be given through a catheter twice a week every 21 days. Dexamethasone and lenalidomide will be given orally. In general, a cycle of chemotherapy will last 21 days.