10 ms·

Clinical trials for cancer prevention would mean 20-50 years no? That's a pretty big undertaking. I mean you would need a control group and a real one, and the

• dekhn 9y ago
  no. Cancer trials take a few years. You don't need to wait for everybody to get cancer, because small numbers of people get cancer stochastically every year.
• ekianjo 9y ago
  Cancer is not rare enough to make it impossible to test in controlled populations. And actual cancer drug trials can recruit several thousands of patients routinely and will show clear survival benefits on that kind of base size if the effect is large enough.
• hollander 9y ago
  Not only that, but you would need trust in both groups to keep doing what they should for this study. For 20 years, that's really long.