Our specific aim is to compare the rates of ovarian preservation in reproductive age women receiving chemotherapeutic agents known to affect ovarian function who receive Cetrorelix acetate co treatment with women who receive these agents and do not receive Cetrorelix acetate. A second aim is to evaluate the ability of the Cetrorelix acetate co treatment to induce therapeutic amenorrhea in a study population at risk for thrombocytopenia and associated heavy vaginal bleeding.