All patients who were on lenalidomide and then stopped taking it, will be checked every 3 to 5 weeks for a period of 1 year. During the follow-up visits, certain tests and procedures will be performed. These include a symptom questionnaire, blood draw for routine tests, a check of your side effects, and pregnancy testing for women who are still able to become pregnant. These are the same tests that were done while you were on the study.