Ketogenic Diet helpful or not?

Our sons synovial sarcoma had another reoccurrence in his other lung two weeks ago. Surgery was successful. We are still waiting for the results for another treatment plan...A good friend of us suggested to start on the ketogenic diet. Has anyone used this? Does it seem to be successful?? http://maxloveproject.org/research-summary-nutritionalmetabolic-approaches-to-cancer-treatment/)

Here is a discussion on the subject:

http://forum.synovialsarcomasurvivors.org/forum/topics/ketogenic-diet