Abstract

Data Safety and Monitoring Boards were introduced in the 1960s to monitor data in clinical trials to ensure subject safety. It was thought important that DSMB members be experts in the field of interest, but not otherwise involved in the study in order to maximize objectivity. Since then, the use of DSMBs has increased dramatically, and their scope has expanded to include scientific issues — in particular, to avoid bias that can result when trials are stopped early because of evidence that one treatment has greater efficacy or causes greater harm than another; or that no treatment is likely to do better than any other.