Week 7- How sophisticated is our understanding.Cancer

It seems that over the years, we have learned how cells mutate to become cancer cells, but there are still arguments as to why. And, although there IS so much information about cancer, there are so many questions left unanswered. Some scientists think mutation is due to oncogenes, others talk about methyl groups. It seems lifestyle, tobacco use, etc, is a big part of cancer, yet many people experience cancer with having lived a pretty well-balanced life and diet...