There is research showing certain foods can help prevent cancer. Eating a mostly plant-based diet has the strongest evidence. I'm not sure if you are requesting for cancer prevention or to help during treatment, however the recommendations somewhat overlap.
In general, I would suggest taking a look at AICR's Second Expert Report (http://www.aicr.org/foods-that-fight-cancer/). Here they outline the research on various foods and their link to cancer. It's a large report, but easy to skim through to find a few that work for you and your specific cancer type.