British Society for Gene and Cell Therapy is very happy to support the All Trials campaign. As a society, we strongly believe that the publication of all clinical trials data is critical if we are to accelerate the development of effective, evidence-based treatments for patients. Restricted access to clinical data slows progress and hampers the efforts of research scientists and healthcare professionals. All clinical trials should be registered and the results, whether negative or positive, be made available to researchers and clinicians.