Steve Jobs suffered from a rare pancreatic cancer known as "islet of Langerhans cell neuroendocrine tumors" or "pancreatic neuroendocrine tumors". The good news is that these tumors grow very slow and can be successfully treated after they have spread. The side effects of these tumors however are no easy treat, as the endocrine gland produces hormones and with extra tumors, extra hormones will be secreted.
Steve Jobs, the thinker-outside-the-box that he is, went for alternative treatment before opting for a Whipple Procedure to remove the cancer.