The maintenance period in both phases will start at the end of the 9th course and will be stopped at progression or intolerance. The median expected duration of the maintenance treatment is approximately 2 years. The duration of follow-up from relapse will be approximately 2 years. The occurrence of PD will determine the duration of TTP of each patient. The occurrence of death will determine the duration of overall survival. The first analysis to evaluate safety and efficacy is planned when the 19 patients enrolled in the first stage of the study have completed the third cycle of induction treatment.