hi I saw one of your other posts and though I was very recently diagnosed with aggressive breast cancer and so busy but I am working on an answer for you.
I do not feel vegan is enoug though it is a good start.
I would immediately go to juice fasting, colon cleansing (herbdoc.com intestinal #1 and #2), at least 5- 8 oz glasses of raw carrot juice some raw carrot spinach juice (these are specific to cancer and many who healed used these juices, (I am getting 50 lb bags at a wholesale produce company at $27 a bag--it takes about 3 bags a month or 150 pounds..drink within 20 minutes and chew the juice take no pulp or food with it), a lot of green juices, then raw, vegan, whole foods, organic if at all possible (100%) and later when better for a while maybe try dropping to 80 to 90% raw.
Also immediately get the book mind over medicine you can heal yourself paying special attention to the nocebo along with the placebo with peer reviewed, control group studies.