Cancer is tough.
My wife and I have a very immediate family member battling stage 4 cancer, and he's only 35. It started off with him not being able to swallow his food well, so he went in for a scope and found a massive esophageal tumor.
They did a very long surgery, and the tumor was attached to his heart, liver, and totally engulfed his stomach and esophagus. They removed about 90% of his stomach, and then, connected what was left of it to what remained of his esophagus.
After a few months, he ate relatively normal, and soon after, remission, in late 2018.
November 2019, a routine PET scan showed it had returned, and it's aggressive. It metastasized and involves parts of his liver and is in a spot where it's inoperable.
Chemotherapy is one of the worst things to watch someone go through. The surgery on top of that, and it makes cancer a very, very cruel (and expensive) disease. Chemo just wrecks your body in ways you would have never thought. So many associated health issues start arising, as a result.
I've never come across a cancer story I didn't hate.