- Pregnant women are ineligible as treatment involves unforeseeable risks to the participant and to the embryo or fetus. Women must either be not of child bearing potential or have a negative pregnancy test within 7 days of treatment. Patients are considered not of child bearing potential if they are surgically sterile (they have undergone a hysterectomy, bilateral tubal ligation, or bilateral oophorectomy) or they are postmenopausal. Men and women must be willing to use adequate birth control measures to prevent contraception.