Cancer cells can't survive in an alkaline body. An alkaline diet would certainly help. Refined sugar and junk food is the biggest no no.
My sister was diagnosed in Sept with her breast cancer spreading to both lungs...stage IV. She refused the traditional route this time and went on an alkaline diet (Gerson) at home. She added other things to her protocol, including drinking ozonated water, ACHH, Essaic tea, lots of supplement, etc and she kept a positive attitude, which is very important. She later added MMS therapy and did great on it. By Dec 6 her markers had gone down to 16 and she is doing great. Her oncologist had given her one or maybe two years to live....but she tricked him!
The thing is your wife must remain alkaline, which allows the immune system to do it's job getting rid of cancer cells. The trick is to kill off cancer cells faster than they can multiply.