Note that I don’t believe this is limited to cancer trials. Ethical considerations mean that in any situation where a treatment is known to be effective, withholding it would be wrong, so the most effective drug must be competed with. In addition, the goal of a new drug is to be better than its competitors, and comparing it to a placebo wouldn’t help with this
Note that I don’t believe this is limited to cancer trials. Ethical considerations mean that in any situation where a treatment is known to be effective, withholding it would be wrong, so the most effective drug must be competed with. In addition, the goal of a new drug is to be better than its competitors, and comparing it to a placebo wouldn’t help with this