Despite the fact that 170 out of the 351 patients randomised to placebo/dexamethasone received treatment with lenalidomide/dexamethasone after the studies were unblinded, the pooled analysis of OS demonstrated a statistically significant survival advantage for lenalidomide/dexamethasone relative to placebo/dexamethasone (hazard ratio = 0.75, 95% CI = [0.59, 0.95], p=0.015).