only another year-and-a-half. but she has lived two-and-a-half years and counting, and her tumors have shrunk a bit. why has she lived longer than most? >> i think, first and foremost, it's my faith. and -- in god. >> reporter: and also, she says, because of one of her medicines, avastin. like other patients, she uses it in depositicombination with chey drugs. >> people respond differently to different treatments. and for whatever reason, i have responded positively to this treatment. >> reporter: dr. edith perez is her doctor. >> before she started this treatment, she was in bad condition. >> you have seen tumor shrinkage? >> yes, yes. definitely. >> reporter: but she is afraid her insurance might soon stop paying for avastin because recent studies show breast cancer patients, on average, don't live longer with avastin. plus, the drug has serious