Exactly. Patient selection in clinical trials is already notoriously difficult even with phase I trials where it's a few dozen healthy people at most. Finding t

Exactly. Patient selection in clinical trials is already notoriously difficult even with phase I trials where it's a few dozen healthy people at most. Finding the right patients so your control and test groups don't have a lot of confounding factors is a field unto itself. Doing so with terminal patients, who often have a lot of things going on including just the psychology of dying, is even more so. Almost everyone hires out to contract research organizations that have entire departments dedicated to the process with years long relationships with major hospitals and patient groups that serve as "sales funnels" for their clinical trials.