Based on results from the phase 1 portion, the Data Monitoring Committee confirmed 4 mg/day as MTD of pomalidomide. Therefore, the recommended starting dose of pomalidomide for Phase 2 was 4 mg/day on Days 1-21 of each 28-day cycle. In the combination treatment arm, the starting dose of dexamethasone was 40 mg once per day. For subjects who were > 75 years of age, the starting dose of dexamethasone was 20 mg once per day. To prevent blood clots, all participants were to be given aspirin 81-100 mg daily (commercial supply) unless contraindicated. If contraindicated, another form of anti-thrombotic therapy was provided.