There are cures for cancer, I am wondering which scenario is valid:
He was murdered;
He was overwhelmed & didn't take precautions & effective treatment;
He didn't know about cancer prevention and cures.

There is a clinic in TiaJuana, Mexico that is famous for curing cancer.
Hoxsey cancer cures, that the AMA spent tons of money to destroy.
https://stfrancisherbfarm.com/product/hoxsey-formula/