- 1. Pregnant or breastfeeding females 2. Hypersensitivity to thalidomide, lenalidomide, or dexamethasone 3. ≥ Grade 3 rash during prior thalidomide or lenalidomide therapy 4. Subjects unable or unwilling to undergo antithrombotic prophylactic treatment will not be eligible to participate in this study 5. Any of the following laboratory abnormalities: