I'm not sure on the rules of a thread resurrection, and I am not making an opinion either way about the diet.
But I just found that they are starting a clinical trial for both
HPV+/- Stage II-IVa HNSCC involving chemo/radiation and a Ketogenic diet. Some may be interested.
http://clinicaltrials.gov/ct2/show/NCT01975766?term=ketogenic+cancer&rank=2