 - Pregnant women are excluded from this study because bevacizumab, radiation therapy, and 5-FU have potential for teratogenic or abortifacient effects; because there is an unknown but potential risk for adverse events in nursing infants secondary to treatment of the mother with bevacizumab, breastfeeding should be discontinued if the mother is treated with bevacizumab; these potential risks may also apply to other agents used in this study 