- The patients will be randomized into two groups. Group R will receive lenalidomide 25 mg/day p.o. continuously for 21 days and group Rb will receive a similar dose of lenalidomide with the addition of 40 mg of dexamethasone p.o. on days 1, 8, 15 and 22 of every 28 day treatment cycle. Study includes a maximum of 24 cycles including two consolidating cycles per patients.