How long before that becomes a mandatory test to get health insurance? Or somehow the data is bought by insurers who then use it to jack up the rates for those who will eventually get cancer. God I hate the US healthcare system!
This applies both to employer plans and the ACA plans on healthcare.gov, where you can get a quote without giving them any health data at all.
It seems reasonable not to let people over 65 wait until they have cancer before purchasing supplemental insurance.