 6. FCBP must have a negative serum or urine pregnancy test with a sensitivity of at least 50 mIUmL within 10-14 days prior to and again within 24 hours of starting lenalidomide and must either commit to continued abstinence from heterosexual intercourse or begin TWO acceptable methods of birth control; one highly effective and one additional effective method AT THE SAME TIME at least 28 days before starting taking lenalidomide. 