Kaplan-Meier survival curves. (A) Kaplan-Meier curves for OS and PFS in all patients who received at least one dose of lenalidomide (N = 33). Median OS estimated at 4 months (95% CI, 3-9 months), and median PFS estimated at 2 months (95% CI, 2-3 months). (B) Kaplan-Meier curves for relapse-free survival in patients who obtained a CR/CRi (n = 10). Median relapse-free survival for the CR/CRi patients was 10 months (95% CI, 2-NE)