 Patients undergo a transvaginal or transabdominal ultrasound to measure the ovarian volume and count the number of antral follicles at baseline, 3 months after beginning cytotoxic chemotherapy, and at 6 months after completion of treatment. Patients undergo blood collection at the same time points for follicle-stimulating hormone, estradiol, and inhibin B levels. Patients are also asked to fill out questionnaires on estrogen-depletion symptoms at those times. Patients also keep a calendar of menstrual bleeding and hormonal medications. 