Alternative therapy through diet

If conventional medicine can't stop the cancer spread, what else can we do?  How do we choose among the myriad of options each claiming success without the scientific evidence such as a double blind trial?  A lot of prayers.

Ketogenic diet
http://www.charliefoundation.org/ketogenic-therapy/therapies-2/brain-tumor-cancer
http://www.ketogenic-diet-resource.com/cancer-treatments.html

Cannabis oil
https://www.youtube.com/watch?v=hT8ryvvdSto
http://www.sfweekly.com/sanfrancisco/miracle-cannabis-oil-may-treat-cancer-but-money-and-the-law-stand-in-the-way-of-finding-out/Content?oid=2825695
http://www.alternet.org/personal-health/cannabis-helped-heal-my-cancer
http://www.unitedpatientsgroup.com/blog/tag/stan-rutner/

Gerson Therapy
http://gerson.org/gerpress/the-gerson-therapy/
https://www.youtube.com/watch?v=vG9QUFUQmPw&feature=youtu.be

Budwig diet
http://healthwyze.org/index.php/component/content/article/190-the-true-budwig-protocol.html
http://www.budwigcenter.com/testimonials/#.VWLgOU9VhBc

Essential oil

http://quantumhealthconsulting.com/frankincense-and-cancer/

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2664784/

Frankincense oil effect on breast, skin and bladder cancer.  One patient used it to keep her brain cancer in remission.

http://www.ncbi.nlm.nih.gov/pubmed/22171782
http://www.ncbi.nlm.nih.gov/pubmed/19296830