From what i know about cancer, he’s probably cancer-free after 5 years, or at worse in remission, which means there’s no more symptoms. Cancer and chemo does wreck your body pretty hard so it’s much better to take care of your health even after you recover by no more drinking and smoking
i havnt read in a while and my panels are tweaking rn. but does the mc still have that leukemia and 50% chance to die