4. Females of childbearing potential who agree to use a medically accepted method of contraception for a period of one month following the study. Medically acceptable contraceptives include (i) hormonal contraceptives (such as birth control pills, Depo-Provera, or Lupron Depot) if such use is approved by the subject's Oncologist; (ii) barrier methods (such as a condom or diaphragm) used with a spermicide, or (iii) an intrauterine device (IUD).