In November 2011, the Data Monitoring Committee concluded it was unlikely that the study would meet its primary endpoint of overall survival (OS) and recommended that the study be stopped. The study was terminated in accordance with this recommendation. All sites were instructed to immediately discontinue all patients from experimental lenalidomide/placebo treatment administered either in combination with chemotherapy or as a single agent following chemotherapy discontinuation. Subsequently, Protocol Amendment 3 was issued to provide for the following: