Diet  and other changes can be great, but the chance of them being an effective treatment on their own for TC is very very low. 

Don't get me wrong there are tons and tons of issues with big pharma, and I wouldn't put it past them to ignore or suppress info on treatments that would be less profitable. But until the developments of modern chemo regiments TC was basically a death sentence, it didn't matter what diet you had or what other therapies you tried. 

Making sure to get a good diet and plenty of vitamins and minerals definitely won't hurt and will raise your over all health, but I doubt it's going to treat anything unfortunately. Chemo works for very specific reasons that can't be replicated easily.