 - Pregnant or breasting feeding. Due to unknown risks and potential harm to the unborn fetus a negative serum pregnancy test within 10 days prior to registration is required in patients with child-bearing potential. For this reason patients of child-bearing potential must agree to use adequate contraception hormonal or barrier method of birth control; abstinence not having sex, oral contraceptives, intrauterine device IUD, DeProvera, tubal ligation, or vasectomy of the partner with confirmed negative sperm counts in a monogamous relationship same partner. An acceptable, although less reliable method involves the careful use of condoms and spermicidal foam or gel andor cervical cap or sponge prior to study entry and for the duration of study participation. Should a woman become pregnant or suspect she is pregnant while participating in this study, she should inform her study physician immediately. 