The patient is desperately ill. She needs treatment right away. But you need research subjects for your clinical trial, and she wants proven therapy. What's a clinical investigator to do?
The answer is simple: pay her to sign up for the trial. You get a research subject; she gets a paycheck; and if the experimental treatment doesn't work, well, you warned her about that in the consent form. That's the win-win solution that is being tossed around by two University of Chicago professors, and ethicists are taking it seriously. Read about it in Nature.