For courses 1 and 2, patients receive oral lenalidomide once daily and oral prednisone once daily on days 1-28. For course 3, patients receive oral lenalidomide once daily on days 1-28 and oral prednisone once on days 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, and 27. Patients with stable or responding disease after course 3 receive oral lenalidomide alone once daily on days 1-28 for courses 4-6. Treatment repeats every 28 days for up to 6 courses in the absence of disease progression or unacceptable toxicity.