Interesting points. I disagree, though.
I'd be surprised if anyone can affirm such details without access to his medical records, furthermore personal who does have access are bound by privacy not to divulge such details.
Here is a somewhat professional opinion, which can't affirm anything for that matter: http://www.webmd.com/cancer/pancreatic-cancer/news/20110825/faq-steve-jobs-pancreatic-cancer
It may very well be that surgery + following liver transplant and the coming with it immune suppressants to prevent transplant rejection have killed him. You can't beat a bug while on immune suppressant, not to say cancer.
BTW cancer survival is calculated for the 5 yrs following the diagnosis. That means if the patinets dies on the next day of the 5th year limit, he is still considered a survivor ! :) There are no studies to my knowledge comparing long-term living chances for those with cancer vs. those without.