{"groups":[{"description":"150 milligrams (mg) Abemaciclib orally every 12 hours plus either 1 mg anastrozole or 2.5 mg letrozole orally once daily for 28 days (28 day cycles).","id":"FG000","title":"Abemaciclib + NSAI (Nonsteroidal Aromatase Inhibitors)"},{"description":"Placebo orally every 12 hours plus either 1 mg anastrozole or 2.5 mg letrozole orally once daily for 28 days (28 day cycles).","id":"FG001","title":"Placebo + NSAI"}],"periods":[{"dropWithdraws":[{"reasons":[{"groupId":"FG000","numSubjects":"28"},{"groupId":"FG001","numSubjects":"16"}],"type":"Withdrawal by Subject"},{"reasons":[{"groupId":"FG000","numSubjects":"1"},{"groupId":"FG001","numSubjects":"0"}],"type":"Lost to Follow-up"},{"reasons":[{"groupId":"FG000","numSubjects":"236"},{"groupId":"FG001","numSubjects":"119"}],"type":"On Study Treatment/ Follow Up"}],"milestones":[{"achievements":[{"groupId":"FG000","numSubjects":"328"},{"groupId":"FG001","numSubjects":"165"}],"type":"STARTED"},{"achievements":[{"groupId":"FG000","numSubjects":"327"},{"groupId":"FG001","numSubjects":"161"}],"type":"Received At Least One Dose of Study Drug"},{"achievements":[{"groupId":"FG000","numSubjects":"63"},{"groupId":"FG001","numSubjects":"30"}],"type":"COMPLETED"},{"achievements":[{"groupId":"FG000","numSubjects":"265"},{"groupId":"FG001","numSubjects":"135"}],"type":"NOT COMPLETED"}],"title":"Overall Study"}],"preAssignmentDetails":"Completers are participants who died."}