- Any of the following current (less than or equal to 4 weeks) or planned therapies (tamoxifen, raloxifene, or aromatase inhibitors are allowed, but patient must have been on a constant dose for greater than or equal to 4 weeks and must not be expected to stop the medication during the study period): antineoplastic chemotherapy, androgens, estrogens, progestational agents, other herbal supplements, including soy (herbal teas from a grocery store are allowed), warfarin (1 mg of daily warfarin is allowed for central line patency)