Has anyone heard about the Keto diet helping to fight tumours?

@kmakm today I found out I have to start with chemo.  I went to the health food store and they have all kinds of interesting supplements that look like they would be good for cancer.  But then I think I saw something on my form that I should check before taking herbs.  Does anyone take any herbal remedies? in particular I was thinking of getting this one: http://https//www.medicinenet.com/methylsulfonylmethane_msm-oral/article.htm#what_is_msm_methylsulfonylmethane__and_how_does_it_work_mechanism_of_action