- Pregnant or breast-feeding women will not be entered on this study; pregnancy tests must be obtained in girls who are post-menarchal; males or females of reproductive potential may not participate unless they have agreed to use two methods of birth control - a medically accepted barrier method of contraceptive method (e.g., male or female condom) and a second effective contraceptive method of birth control - during protocol therapy and for at least 4 months after the last dose of XL184; abstinence is an acceptable method of birth control