Elephants and Mole-Rats are both immune to cancer. Their
Their bodies evolved to kill or cannibalize cancer cells as sunsoon as they find them.
But cancer is not a disease, it's: it is an error in the mechanism of multi cellular-cellular systems, Al. All you have to do is making Aliensmake aliens that don't experience these errors or make them immune like Elephantselephants and Ratsrats on earthEarth...