Jeff,
I really don't know if I would recommend WBR to prevent brain metasteses for several reasons.
Primarily only 1 in 3 metastatic bc patients will ever develop brain mets. Secondly, the long term side effects vastly outweigh its preventative value.
I would encourage EVERY woman who is diagnosed as stage IV to demand a regular brain MRI. I have even read of patients reporting sympotoms so the oncologists would have no choice but to order one.
Fortunately brain mets, if caught at an early stage, are highly treatable through surgery, WBR, Gamma Knife and Cyberknife. There is also a clinical trial to see if Lapatinib can treat brain mets.
Incidently, this website has a newly updated Metastatic Brain Tumor page which is about 95% complete :
http://her2support.org/a/newher2_002.htm
We are waiting for a final submission by a member of a reknown neurological surgery team that we have commissioned.
Warmest Regards
Joe