If you care to learn more about the disease and the search for a cure, check out "The Emperor of All Maladies: A Biography of Cancer" by Siddhartha Mukherjee. Fascinating, scary and sobering.
I understand that people die in other ways too, of course, but I think cancer is a common agent that is just how dying works. It's like getting gray hairs -- you can do things to try and stop or cover it up (and some people will get old without much graying), people can fantasize about a fountain of youth that will keep your body at age 21 forever, but the reality is that graying is just part of aging and nothing is going to change that despite any realistic effort that humans can put in. Cancer is part of dying for many, many people. It's not going to go away despite our best efforts to mitigate its effects or eradicate it entirely.
I once read the supposed confession of a medical research assistant that "cancer" as a general thing is not curable but they keep the myth alive because "cure cancer" makes a really decent slogan.