By the time he realized it wasn't a joke the effective treatments were too late.
He used his wealth and influence to get on organ transplant lists in numerous states. At the time doctors were publicly confused because the organ could no longer save his life, only extend it. This action likely cost another person their life.
With his final days he designed and built a super-expensive yacht...
Steve Jobs may not have been sociopathic but he wasn't someone that cared about the well-being of others. He was the first member in the cult of his own ego.