• The primary endpoint is the overall response rate defined as the partial or complete response to treatment according to EBMT criteria. Overall response will be assessed at each treatment cycle up to 8 cycles. [ Time Frame: Assessed at each 21-day treatment cycle up to 8 cycles and over 6 months following discontinuation of all study drugs. ] [ Designated as safety issue: No ]
  

• Secondary endpoints include time to disease progression (treatment start to disease progression or death due to progression); best response assessed by the investigator; duration of response; and overall survival (treatment start to death by any cause). [ Time Frame: Day 1, Cycle 1 throughout treatment cycles and follow-up. ] [ Designated as safety issue: Yes ]
  

The primary purpose of this study is to evaluate the overall response rate to DOXIL/VELCADE treatment in patients with relapsed multiple myeloma previously treated with VELCADE. Overall response rate is defined as the proportion of patients achieving either a complete response (CR) or partial response (PR) to treatment according to the European Group for Blood and Marrow Transplantation (EBMT) criteria. This is a single arm (all patients will receive the same drug combination and dose), multi-center (many study sites), open label (the patient and the physician know the drug treatment being received) of approximately 60 patients with multiple myeloma whose disease has progressed after initial response to VELCADE-based therapy. During each 21-day treatment cycle, patients will receive VELCADE by intravenous bolus on 4 designated days, and DOXIL by intravenous infusion on one designated day. Treatment will continue until disease progression, or the occurrence of unacceptable treatment-related toxicity or up to a total of 8 cycles of therapy. Drug doses may be delayed or dropped as needed to allow for platelet transfusions or other treatment requirements. Patients responding to treatment at study end may be evaluated for continued treatment for as long as treatment can be tolerated and they continue to respond. After discontinuation of all study drugs, patients who have not had disease progression will be followed for 6 months after receiving the last dose of study drug. The primary endpoint is overall response rate as defined by the proportion of patients achieving either a complete response or a partial response. Response will be assessed at each cycle. Safety will be monitored throughout the study by physical examination, clinical laboratory testing, and the incidence and severity of reported adverse events. Overall safety will be summarized at study-end.

During each 21-day treatment cycle, patients will receive bortezomib 1.3 mg/m2 by intravenous bolus on Days 1, 4, 8 and 11 and pegylated liposomal doxorubicin 30 mg/m2 by intravenous infusion on Day 4.