As Dr. Sid Gilman approached the stage, the hotel ballroom quieted with anticipation. It was July 29, 2008, and a thousand people had gathered in Chicago for the International Conference on Alzheimer’s Disease. For decades, scientists had tried, and failed, to devise a cure for Alzheimer’s. But in recent years two pharmaceutical companies, Elan and Wyeth, had worked together on an experimental drug called bapineuzumab, which had shown promise in halting the cognitive decay caused by the disease. Tests on mice had proved successful, and in an initial clinical trial a small number of human patients appeared to improve. A second phase of trials, involving two hundred and forty patients, was near completion. Gilman had chaired the safety-monitoring committee for the trials. Now he was going to announce the results of the second phase.
