RecruitingClinical trialBrief Title Mechanisms of Cancer-Related Pain and Opioid Use Among Adolescents and Young Adult Sarcoma Survivors: Pilot Feasibility StudyThis study generates information on the feasibility and acceptability of a 3-month ecological momentary assessment (EMA) protocol to assess chronic pain and opioid use in adolescent and young adult (AYA) sarcoma survivors.