Diana,
Dr. Keith Black's team at Cedars Sinai Medical Center has a scan review program:
http://www.csmc.edu/2233.html
Dr. Black is perhaps the most prominent neurosurgeon in the United States.
Cyberknife is a non-invasive treatment with little or no side effects.
Tykerb and Xeloda is one of the newer treatments to prevent brain mets. I doubt if you will be on the drugs forever. But you will have to be monitored at regular intevals with Brain MRI's
REegards
Joe