Yeah, cells have to replicate. And whenever they do, there's a chance of mutation. And whenever that happens, there's a chance it will be malignant. Multiply

Yeah, cells have to replicate. And whenever they do, there's a chance of mutation. And whenever that happens, there's a chance it will be malignant. Multiply up enough of those chances over time, and the limit approaches a 100% chance. It's almost surprising that so few people die of cancer. Of course, it's always happening, and our bodies are fighting it off all the time. But each time they try, there's a chance that it won't be effective. So it still over time approaches 100%, if something else doesn't get you first.