According to a study published in the BMJ in March: “Much of the information collected in unsuccessful drug trials is inaccessible to the broader research and practice communities”. The BMJ study found that the rate of non-publication of stalled drug trials was significantly higher for studies that did not complete enrollment compared with licensed drug trials. A total of 20 135 patients participated in trials of stalled drugs that were never published. You can access the full paper at: http://www.bmj.com/content/350/bmj.h1116