My oldest sister has been going through a cancer bout of her own. When it initially started causing problems, nobody could find anything wrong. It just happened to be a nurse that worked at her husband's mine looking over various results that the actual cause was pinned to a form of brain cancer. She's had a couple small operations and went through a round of chemo late last year, and we're basically in wait and see mode now. But basically the doctor who worked on her was surprised she'd survived and there are still a-hole docs here who won't see her whenever she has an issue, usually resulting in a 2 hour drive to Pittsburgh.
Stupid medical system is bad enough between costs and insurances, nevermind adding bad/lazy doctors to the mix.