The truth, is modern medicine treating about cancer (chemotherapy, immunotherapy, ..) is putting a bandage on a real underneath problem. It will comes again, may be take some years. One of good actor from my place is passed away with cancer few weeks before https://en.wikipedia.org/wiki/Jishnu. He also did chemotherapy few years before.
We should care about these deadly diseases, or DNA mutation, what causing it. Any bug happens, we can resolve it, but losing a person we can't recover.
I am the one of person who also suffering from autoimmune disease.