Small cell carcinoma of the ovary, hypercalcemic type (SCCOHT) is a rare, highly malignant tumor that affects mainly young women. The median age of diagnosis is 24 years old. Approximately two thirds of patients with ovarian small cell carcinoma have hypercalcemia.The SCCOHT Patient Registry allows patients diagnosed with SCCOHT, their families, and researchers to gather and share information and health history in a safe, confidential, online database. This registry will help us better understand the major health issues among individuals with SCCOHT, improve the natural history for the diagnosis, gain insight into treatments, and help us recruit for future pre-clinical research studies and therapeutic clinical trials all while educating the community and raising awareness regarding diagnosis, study of the causes and treatments.