https://pubmed.ncbi.nlm.nih.gov/16172215/
I mean... in terms of our scientific understanding at this point, sporadic pancreatic cancer just comes from nowhere. We don't know why. In the case of the parent I lost to it, it could have been triggered by a response to inflammation from previous surgery. It seems plausible. But nobody knows.
I just think people snarking or factoiding about Steve Jobs' panicked response to an awful disease comes across as projection of other judgements more than anything else. He was a complicated, self-reliant person who made a bad decision when he was scared. And it probably (but by no means certainly) cost him a few years of health. And now he is gone. And it's still sad for the people who lost him and for the wider world.