LBH589 in Relapsed or Relapsed and Refractory Waldenstrom's Macroglobulinemia

This phase II study is designed to assess the toxicity profile and the proportion of overall response in patients with relapsed or refractory WM. This will study the effect of single agent LBH589 on response in these patients. Efficacy measures will include both objective clinical measurements and investigator-reported outcomes. Response and time to event analyses will follow the criteria set forth in the International Waldenstrom consortium recommendations. Prior to the start of the study, investigators will assess disease and perform a CT scan of the chest, abdomen and pelvis. Response will be assessed after 2 cycles. If patients have stable disease or response, then they will continue on therapy until progression or unacceptable toxicity, being assessed every cycle until the sixth cycle and then every 3 months. Patients who show progression after 2 cycles will come off therapy and undergo event monitoring every 3 months. All responses will be assessed by M-protein quantification and immunofixation from serum and IgM monoclonal protein level. In addition, BM biopsies will be done at baseline, at the end of cycle 6 and at the end of all therapy. The protocol was amended because of concerns of toxicity to allow a starting dose of 25 mg; 12/36 (33%) patients were enrolled on the 25 mg dose.