Interestingly, some months ago my ENT was telling me that if my scans one year post-rad were OK, we could use the other 'C' word, "cured". But he did couch it in terms of statiscal probability over five years.
BTW, since I subsequently did have clean scans, he told me that in my case, the five-year cancer-free likelihood was now at 90% -- From a half-full perspective, that's a low probability of return; for pessimists, that's a 10% chance of return, lots better odds than a lottery ticket!
Yesterday, I was vacuuming the bed of my pickup truck, backing out of it and managed to lose my balance and tumbled out onto the ground -- Could have broken my neck and died, which would have put my probability of being cancer-free at 100% for the last few moments of my life, so what does it really all mean?
