Question for people who had/have brain mets

[IVW]

My tumor markers have been a good indicator of cancer in my body ever since diagnosis 6 years ago. So, I pay attention to it even though oncologists tell you not to.

I had mets in bone, liver and and lung. A year of herceptin and navelbine weekly cleared them all up, my tumor markers dropped amazingly within weeks of starting this regime. My CA- 27/29 went down to normal (from 405 to <37) the CEA dropped from like 18 to 8 but never got to normal (3 or less). When an MRI found 3 brain mets and I had whole brain radiation and then stereotactiv radiation, my CEA finally went down to the normal range. So, now I feel like the CEA seems to indicate what is going on in my brain.