7. Negative serum pregnancy test (serum HCG) within 7 days of study treatment if female and of childbearing potential (non-childbearing is defined as greater than one year post-menopausal surgically sterilized). Since beta-HCG may be falsely elevated as a result of malignancy, women of child-bearing potential who have an elevated serum beta-HCG level are eligible for enrollment if they have two Transvaginal Ultrasound (TVUS) scans one week apart along with serial beta-HCG levels two weeks apart that are inconsistent with pregnancy and a Gynecology consult to ensure that the beta- HCG level was at a value high enough to see pregnancy with TVUS.