Patient Decision Aid in Supporting Decision-Making About When to Start or Stop New Drugs, Join Clinical Trials, or Continue Active Surveillance in Patients With Medullary Thyroid Cancer and Their Caregivers

PRIMARY OBJECTIVES: I. To assess patient/survivor, caregiver/family member, and provider decision-making needs. II. To design and develop an initial patient decision aid prototype. III. To pilot test its acceptability. IV. To evaluate the acceptability and usability of the decision aid prototype from patients/survivors, caregivers and providers in a real world environment. OUTLINE: Participants use decision aid and complete questionnaire.