The Food and Drug Administration is telling Doctors not to prescribe a popular drug used for treating breast cancer.

FOX News Radio's Steve Taylor reports from Washington:

 

 The drug is Avastin. It will continue to be approved for colon cancer and some other tumors, but the FDA says Avastin shouldn't be used by breast cancer patients because there is no proof that it makes them live longer and it does cause dangerous side effects. The FDA says it knows this will disappoint patients running out of options, but that drugs must be both safe and effective.

In Washington, Steve Taylor, FOX News Radio.