OUTLINE: This is a multicenter study. Patients are stratified according to risk (poor-risk group [mixed or no response to induction therapy or progression during or after induction therapy] vs good-risk group [partial response after 4 courses of induction therapy]) and kidney function at study entry (glomerular filtration rate [GFR] ≥ 100 mL/min vs GFR 60-99 mL/min)