The most important thing you need to do is make sure you have a kidney cancer SPECIALIST, no a regular oncologist. The new treatments for kidney cancer are not very well known by general oncologists. My mother has stage 4, and had mets to her lymph nodes between her lungs and numerous mets on her liver. She has done treatment with Nexavar, Avastin, and now Sutent. Nexavar worked very well for several months and then kind of hit a plateau, Avastin did not work for her at all, Sutent is what she is on now (which is very similar to Nexavar) and she will have a scan Dec 6 to see how well it is working. I know these treatments help with mets to lungs, but have not had to deal with any mets to the brain. But we have been researching a treatment that fries the tumors with radio frequency (RFA) ablation and I do know that can be done to mets on the brain. If you do not have a RCC specialist, I would highly recommend finding one ASAP. If you already have one, I would ask about any treatments that I mentioned that they havent tried thusfar...
I hope this helped at least a little. Let me know if i can be of any further help to you...
I would be glad to help any way I can
Casie