PFS and OS for elderly patients on lenalidomide frontline therapy. (A) PFS and OS for all patients on frontline lenalidomide therapy. At 24 months of follow-up, the median PFS was 60% and OS was 88%. (B) PFS for all patients according to achievement of PR or better compared with patients who did not achieve an objective response. (C) OS according to achievement of PR or better compared with no response.