{"groups":[{"description":"Participants are switched from their current opioid medication (oxycodone or morphine) to methadone. Participants receive oral methadone 2-3 times daily for 4 weeks.","id":"FG000","title":"Arm I: Opioid Rotation to Oral Methadone"},{"description":"Participants currently receiving oxycodone are switched to sustained-release (SR) morphine. Participants currently receiving morphine are switched to SR oxycodone. Participants receive either oral SR morphine or oxycodone 2-3 times daily for 4 weeks.","id":"FG001","title":"Arm II: Opioid Rotation to Another Long-acting Strong Opioid"}],"periods":[{"milestones":[{"achievements":[{"groupId":"FG000","numSubjects":"1"},{"groupId":"FG001","numSubjects":"0"}],"type":"STARTED"},{"achievements":[{"groupId":"FG000","numSubjects":"1"},{"groupId":"FG001","numSubjects":"0"}],"type":"COMPLETED"},{"achievements":[{"groupId":"FG000","numSubjects":"0"},{"groupId":"FG001","numSubjects":"0"}],"type":"NOT COMPLETED"}],"title":"Overall Study"}],"recruitmentDetails":"Recruitment Period: March 10, 2009 to October 1, 2010. Recruitment occured within University of Texas MD Anderson Cancer Center and Palmetto Hematology Oncology at Gibbs Regional Cancer Center."}