A spiritual effect of cancer is it reminds the organism of its impermanence. We walk on earth without acknowledging the true significance of impermanence, but of course, it does not necessarily need to take to something as  earth shattering as cancer to remind oneself of impermanence. As far as remission, OP could be alluding to &#x27;mind over matter&#x27;, etc. I could say more, but skeptics gonna skeptic. In these matters there are usually opposing sides which never meet in the middle. One side emphasizing the importance of direct experience and the other side first demanding proofs of that experience before themselves exploring (as if certainty is communicable), a fear based reaction to not simply plunge into the unknown and see beyond recurrent thinking.