That is good you posted that. Phillips has some good information. I have heard multiple doctors (and testimonials by patients) say that a very strict ketogenic diet greatly increases tolerance to chemo (people don't get as sick from the treatment) as well as keeping the cancer cells from adapting to the chemo so it will be effective longer before they have to change therapies.

A very strict ketogenic diet has been used for many years to control epilepsy in patients that do not respond to drugs and before the drugs were created it was the only treatment. Getting much of the sugar out of the blood stream can be very healing. Cancer cells love glucose. Not so much ketones.

Edit: decided to do a search on the subject and see what comes up. Here it is. 
https://www.youtube.com/results?search_query=glioblastoma+ketogenic+diet#mce_temp_url#