Not original, I know.
But, my brother-in-law's mother has stomach cancer, spread to her liver and lungs; and my brother and sister's father has cancer in his kidneys, though a much less vicious kind, apparently. My own dad died already died of it, so I'm thinking about it at the moment.
I feel like this is what happens when you approach 40 and your elderly parents are suddenly quite elderly. I've gone through several funerals already, but still. Death is such a stalker sometimes.