13. Any intrauterine device (IUD) with a documented failure rate of less than 1% per year; oral contraceptives (either combined or progestogen only) where not contraindicated for this subject population or per local practice.; or barrier methods, including diaphragm or condom with a spermicide. Please note that breast cancer subjects on this trial cannot receive injectable levonorgestrel or injectable progestogen due to the potential for an adverse effect of anti-hormonal therapies on chemotherapy administered for breast cancer.