My dad had stage 4 liver cancer, and he was advised to stay away from all sorts of meat, red and white included. His diet was mostly vegetables and lots of fruits. Vit C is also crucial as people with cancer tend to have weakened immune system. That's all I remember, though. I wish I could give you more insights. Also, soursop (a fruit) is a well known anti-cancer food. Your step mom might want to give it a try. I hope she gets better soon.