I am not sure if this would be a possibility for you, I have the same cancer. I completed 34 days of proton beam radiation at Mayo in Rochester and now I am taking Tibsovo instead of Chemotherapy (I did not have surgery). I have minimal side effects and the tumor has stopped growing. The drug is not FDA approved however works much better (as far as side effects go) than chemo. I am not sure if this right for you, but it seems like it might be something you can check into or ask your Doctor. Take care.