GnRHA Therapy and Ovarian Preservation in Pediatric Cancer Patient

This is a prospective case control study. Participants will be enrolled as case subjects or control subjects, depending upon the gonadotoxicity of their chemoradiation therapy. The chemotherapeutic regimens will be determined per standard of care. Participants will receive GnRHa (Lupron) as standard of care for menstrual suppression. Blood draws and pelvic ultrasound at baseline, 6 months and 12 months post completion of chemotherapy are the interventions. The duration of the study will be approximately 12 months.The study time includes the time necessary for completion of most cancer treatments in this population, which approximates 8-12 months, and time to allow complete excretion of the Lupron from the systemic circulation with reliable testing of the hypothalamic pituitary ovarian (H-P-O) axis. The results of the study will be used to guide a larger study evaluating the efficacy of gonadotropin releasing hormone agonist (GnRHa) as ovarian preservation therapy in young subjects receiving chemoradiation.