Prevention of cancer is not a cure, and it would not prevent all types of cancer. Cancer can appear anywhere in the body without any significant "cause". Regula

Prevention of cancer is not a cure, and it would not prevent all types of cancer. Cancer can appear anywhere in the body without any significant "cause". Regular safe sun radiation can be enough to alter certain DNA part during regular cell divide and immune cells might fail to spot the cell and it can start reproducing. Unlike infectious diseases, cancer is the result of evolution within body, it is fundamental to every multicell organism.