Please, please, please..dont give up hope and assume your dad will die!!!! My mom had a LATE stage 4, and had RAD and chemo, and then 2 neck dissections(plus others stuff too), and I am happy to report ALL of the cancer in the oral cavity was cured. And unlike your dad, she didnt go for the other tests, so the cancer had spread to other areas, but by the time we found out, it was too late for her.
My point is, though...since he is clear in lungs, etc, please dont throw in the towel! It can and has been cured....read posts here.....you will see!! This board is FULL of encouraging stories....
Brooke