 12. Females of childbearing potential FCBP must have a negative serum or urine pregnancy test within 30 days of initiation of protocol therapy and must be willing to use acceptable methods of birth control. Men must agree to use a latex condom during sexual contact with a female of childbearing potential even if they have had a successful vasectomy. A female of childbearing potential is a sexually mature woman who: 1 has not undergone a hysterectomy or bilateral oophorectomy; or 2 has not been naturally postmenopausal for at least 24 consecutive months i.e., has had menses at any time in the preceding 24 consecutive months. 