Comment by randallsquared

From the statistics on autopsy and other accidental discovery, it seems that more than 30% of the population has some cancer by age 40 that would never impact their life left untreated (mostly thyroid, prostate, and surprisingly-for-me, breast cancer). Regular widespread full body MRI might catch these, but the effects of treating (e.g.) prostate cancer are so terrible that most would be better off ignoring it.