This is a multicenter, randomized, controlled, 3 arm parallel group study designed to evaluate the efficacy and safety of three all-oral combinations: lenalidomide with dexamethasone (Rd) in comparison with lenalidomide in association with MP (MPR) and lenalidomide in association with cyclophosphamide - prednisone (CPR) in newly diagnosed symptomatic MM patients. This protocol also provides a substudy designed to observe asymptomatic patients excluded to the protocol that in any case could be inserted in the study.