My father is 78 years old with stage 4 cancer of the tonsils and lymph nodes (both sides of the neck). He just started radiation and Dr. said at 4 weeks into the treatment he would recommend chemo as a "boost". Is this the same as traditional chemo and is it adminstered the same way. At 1st my dad did not want chemo but is considering this option. Any information would be helpful. Apparently surgery is not an option because he would lose too much of his face/tongue/neck.

Any info would be helpful..thanks~!