@sheland1, You've already had your share of radiation. I'm glad to hear that they are running biomarker tests on your biopsy tissue. It's the best way to match a treatment to the specific type of cancer. It may not mean that you are headed for traditional chemotherapy. Of course, you are worried, but try not to get ahead of the diagnosis too.
Has your oncologist mentioned the possibility of chemo? Or are they waiting for the biomarker tests to come back?