There is so much literature about cancer and nutrition it would be impossible to describe it all. This american doctor association has a nice infographic and a very well done booklet. Here they are.
pcrm.org/sites/default/files/pdfs/health/cancer/Cancer_Survivors_Guide.pdf
www.pcrm.org/media/infographics/cancer-prevention-infographic
Then later you can from there expand into the medical journals. Many of them you will only be able to read the extract, but it usually contents enough information.
I have a genetic condition which makes me extremely prone to many cancers, so I apply the precautionary principle.
Junk food is just the first step. Many plants and herbs have protective effects. For you a chamomile tea, full of apigenin, is very good, and far more pleasant to drink than turmeric.
www.ncbi.nlm.nih.gov/pmc/articles/PMC2874462/ . From this website you can browse medical articles .
I drink many cups of green tea per day, switch to camomile around 6pm, snack on frozen berries, eat 50-100 gr tomato paste, make big soups, .... and whenever the sun is shinning I try to stay in the sun at around 12pm - 1 pm at least for 30 min without any suncream. For breakfast I have the peel of a couple of apples with papaya and berries. I don't eat the apples as the fruit is just sugar and the protective molecules are in the peel. I already eat quite a fait amount of fruit per day and need to be careful with the sugar.
You might want to research the term antiangiogenesis. Cancer cells need blood to grow. A good 70% of my diet is antiangiogenic (but at the same time, most of these food have good properties anyway, but I won't eat the cheese, duck, ...).
There is very conflictive advice out there. Eat plenty of colours, fresh herbs, ditch dairy and all the processed food from processed meat. Heaps of lemons, olive oil, .... well this is what I do, others might have other opinion. I just cannot take risks.
Fingers crossed, Freddie, and may I suggest you join the Lacies here www.mumsnet.com/Talk/general_health/2816118-CANCER-SUPPORT-THREAD-58-New-thread-new-year-but-the-lacies-are-still-here-Please-join-us-if-you-have-any-sort-of-cancer-or-are-waiting-for-test-results. Fantastic ladies and they might share their diet.