So are planetary risks. They give the name to "astronomically unlikely". But while cancer might not kill everyone at once, it's going to kill billions of us.
We're all going to die. And if we don't get killed by something else, we die of cancer, eventually. Death, taxes and cancer are as close to a trinity of certainty as you can get, and I'm not sanguine about finding a "cure" for conditions that represent the terminus of a lifetime of wear and tear on the body, at least on actionable timescales.