Subjects who discontinued treatment but remained for long-term follow-up in the CC-5013-MM-021 study are required to sign an informed consent document (ICD) to roll over to the Safety Follow-up Phase of the Extended Access Program (EAP). These subjects do not require screening for eligibility but must agree to be followed for survival and Second Primary Malignancy (SPM) at a minimum of every 4 months (± 7 days) intervals for at least 5 years from the time the last on-study subject enrolled in Study CC-5013-MM-021.