{"groups":[{"description":"Participants received rituximab 375 mg/m\\^2 intravenously (IV) every week in Cycle 1 (Days 1, 8, 15 and 22) and on Day 1 of every 28-day cycle from Cycles 2 to 5 plus lenalidomide 20 mg by mouth (PO) once daily on Days 1 to 21 every 28 days up to 12 cycles (21-day treatment and 7-day rest period); if creatinine clearance (CrCl) was ≥ 30 mL/min but \\< 60 mL/min, participants received lenalidomide 10 mg capsules on days 1 to 21 every 28 days.","id":"FG000","title":"Rituximab + Lenalidomide (R^2)"},{"description":"Participants received rituximab 375 mg/m\\^2 IV every week in Cycle 1 (Days 1, 8, 15 and 22) and on Day 1 of every 28-day cycle from cycle 2 to 5 plus placebo (identically matched capsule) once daily on Days 1 to 21 of every 28-day cycle up to 12 cycles.","id":"FG001","title":"Rituximab + Placebo"}],"periods":[{"dropWithdraws":[{"reasons":[{"groupId":"FG000","numSubjects":"1"},{"groupId":"FG001","numSubjects":"0"}],"type":"Adverse Event unrelated to Study Drug"},{"reasons":[{"groupId":"FG000","numSubjects":"1"},{"groupId":"FG001","numSubjects":"0"}],"type":"Death"}],"milestones":[{"achievements":[{"groupId":"FG000","numSubjects":"178"},{"groupId":"FG001","numSubjects":"180"}],"comment":"Started=randomized","type":"STARTED"},{"achievements":[{"groupId":"FG000","numSubjects":"176"},{"groupId":"FG001","numSubjects":"180"}],"comment":"Completed=treated","type":"COMPLETED"},{"achievements":[{"groupId":"FG000","numSubjects":"2"},{"groupId":"FG001","numSubjects":"0"}],"type":"NOT COMPLETED"}],"title":"Pre-Treatment"},{"dropWithdraws":[{"reasons":[{"groupId":"FG000","numSubjects":"2"},{"groupId":"FG001","numSubjects":"0"}],"type":"Death"},{"reasons":[{"groupId":"FG000","numSubjects":"14"},{"groupId":"FG001","numSubjects":"8"}],"type":"Adverse Event"},{"reasons":[{"groupId":"FG000","numSubjects":"21"},{"groupId":"FG001","numSubjects":"54"}],"type":"Progressive Disease"},{"reasons":[{"groupId":"FG000","numSubjects":"13"},{"groupId":"FG001","numSubjects":"7"}],"type":"Withdrawal by Subject"},{"reasons":[{"groupId":"FG000","numSubjects":"2"},{"groupId":"FG001","numSubjects":"1"}],"type":"Other reasons"}],"milestones":[{"achievements":[{"groupId":"FG000","numSubjects":"176"},{"groupId":"FG001","numSubjects":"180"}],"comment":"Started=treated","type":"STARTED"},{"achievements":[{"groupId":"FG000","numSubjects":"124"},{"groupId":"FG001","numSubjects":"110"}],"comment":"Completed=completed 12 cycles of treatment","type":"COMPLETED"},{"achievements":[{"groupId":"FG000","numSubjects":"52"},{"groupId":"FG001","numSubjects":"70"}],"type":"NOT COMPLETED"}],"title":"Treatment"}]}