shrinkage? yes. >> reporter: she is afraid her insurance may stopt paying for it because studies show breast cancer patients on average don't live longer on avastin and it has serious dangers including high blood pressure and internal bleeding. dr. joan mortimer was on the food and drug administration committee that voted against avastin. >> i think based on the objective data that we have right now, there really is no evidence that the benefits of giving avastin with chemotherapy outweigh the risk to the patient. >> reporter: without insurance coverage, villarreal can't pay for it. if patients have to pay for it themselves, how much money is it per month? >> it variouses from institution to institution but it's more than $5,000 a month. >> reporter: that's a lot. do you think avastin is the reason you lived longer than expected? >> i don't know. i couldn't say avastin isn't the