Retrospective time to retreatment comparison of PCR-lenalidomide maintenance to a historical PCR induction alone study. (A) Intent to treat, all patients beginning PCR treatment. The proportion of patients free of retreatment at 36 months was 73% (95% CI: 60-88) for PCR followed by lenalidomide consolidation vs 52% (95% CI: 40-68) for PCR. (B) In a per protocol analysis of the patients in each trial that completed 6 cycles of PCR induction and therefore would have been eligible for lenalidomide consolidation, the proportion of patients free of retreatment at 36 months was 84% (95% CI: 72-98) for PCR-lenalidomide vs 53% (95% CI: 40-70) for PCR.