Hello forums, I have a question, but I will give you a little background before: I recently had an argument with my friend. We both have no medical education, but he's read some books about nutrition and knows great deal about it. He claims that he could actually cure cancer with a proper diet. Actually he is also opposed to conventional treatments. I believe it is a result of him reading some books on bogus theories (I suspect Dr Day's). I don't have the knowledge to really win an argument there, because he always comes back with something else, and I don't have time nor desire to read trough so many books on such topic, but I think there is one thing that I could really prove him wrong: He claims that people do not ever live more than 5 years after chemotherapy. I tried to find some study on this subject, but with no success, whether it is due to lack of such study (I doubt it) or my lack of proper nomenclature and bad keywords. Could you please help me?