Welcome Vithal, and I'm sorry for your fathers diagnosis, and will try to answer your questions as best I can.

i This is the clinical staging T1N0M0, and can be restaged after surgery

II In certain cases, radiation can be given more than once, and is being done more often. I had it 4 times, and going for my 5th soon. Many factors are involved, including the doctors experience, and something you don't plan on doing or want. Your first shot is usually your best shot

iii SCC, non HPV, is usually aggressive, but I'm not familiar with this type cancer,loynoidal lesion, and may also depend on the grade of thr tumor...poorly differentiated being more aggressive, tumor location, size. The doctor will guide you as far as time to decide.

IV they can do a PET/CT scan to see if the is any further involvement, local and distant metastases, in addition too, a triple scope or pandendoscopy of the upper aero digestive tract with biopsies.

V No! I personally wouldn't risk it, but eating a healthy diet, with adequate nutrition, hydration, protein, and fruits and vegetables, can't hurt you. Most CCC have a nutritionist you will see to help.

Are you at a CCC, plan on getting a 2nd opinion? I hope this helps, and good luck.