Deadpool, the comic book character, was a man who had incredible healing abilities, but was disfigured because somehow, his body was also riddled with tumors or cancerous growths. Now, it seems that whoever wrote that into his power set was right on the scientific level: if your telomeres are too long, then you have a higher risk for cancer. In order to keep on going, people in the future may have to periodically subject themselves to gene therapy to adjust telomere sizes for an optimum lifespan without getting the cancer risk.
It's kinda like a built-in anti-obsolescence system. It makes you wonder if our instinctive knowledge of this mechanism in our bodies is the basis for how consumer technology is made.