Five years! I know that's fast by industry standards. Why, it's only one more year than it took us to win World War II. Also, for a full measure of the OODA loop, you should start counting from when the target was discovered.
The way you conceptualise a cancer patient's plight is also insulting and grotesque. They are not nihilists willing to try anything, who we can gladly sacrifice in our pursuit of cure. They have family and friends, and they really want to go their granddaughter's wedding next month and if you harm them with loosely justified bullshit science, you haven't helped anyone.
"Insulting and grotesque" is apparently in the eye of the beholder. I actually find this attitude pretty insulting and grotesque.
Some patients, it's true, are very comfortable being paternalized. Both my grandfathers were killed by the present standard of care in prostate cancer, "watchful waiting." They were both men who would have died rather than challenge an authority figure. And die they did.