 - Females of childbearing potential FCBP must have a negative serum or urine pregnancy test with a sensitivity of at least 50mIUml within 10-14 days prior to and within 24 hours of prescribing lenalidomide and must commit to abstinence from heterosexual intercourse or begin TWO acceptable methods of birth control,at least 4 weeks before starting taking lenalidomide. FCBP must agree to ongoing pregnancy testing. Men must agree not to father a child and agree to use a latex condom during sexual contact with a female of child bearing potential even if they have had a successful vasectomy. 