To answer you first question make sure you bulk up as much as possible. You have to look this as war or no rules boxing. You will lose weight through treatment. Build good muscle and eat good calories and protein. Try 4 to 5000 calories and get as much exercise as you can. You will have a decision on PEG tube and if you do get one before treatment you will lose some weight also. Make the most of preparation.

Second question your care team will make recommendation which normally is both.

Age 55 HPV 16+ SCC, BOT 050613 Stage IV
great team at OSU
Tx 6 weeks of rad started June 3
8 weeks of chemo started May 28
RTOG Phase III trial Cetuximab group.
Treatment completed 7/16/2013
PET Scan completed 10/08/13
Results discussed 10/11/13
NED - Free but am I
Next part of the journey?
1year PET 10/24/14 NED
Good reports now 10 years out.