Cheating the Research?

A 48 year old man has a form of cancer with no known cure. The only treatment just slows the growth of the tumor. He tells his doctor that he only wants treatment if it has a chance of saving his life. His doctor learns of a research trial for a drug that has shrunk tumors in 20 percent of the cases. The only way to get the drug is through the trial. The study involves giving half of the patients the drug, and the other half a placebo, with the groups chosen at random. As his doctor, she will know if he is in the control group. The man says that he will enter the trial only on condition that the doctor notifies him if he is in the control group so that he can leave the trial. Should the doctor agree?