Sorry but this is just false. Everyone has "cancer" all the time because these "mistakes" happen all the time. The reason why someone gets the medical condition, "cancer", is because for some reason, the immune system stops cleaning up these rouge cells. That could be a huge infection or injury, general decay of your body, etc, causing a cancer clump to form. Once cancer reaches a certain size, it will develop mechanism, like acidity, that will inhibit immune response regardless of whether the immune system would now classify the cancer as a threat. In any event, cancer is a very complicated condition, with many different causes. It's unlikely there will be a one-size-fits-all solution.