Biomedical information retrieval is full of challenges, but has the potential to vastly improve the way biomedical information is accessed. This could improve the speed at which treatments are developed and disseminated into clinical practice. This site hosts the information for three of the five major medical track series that have run at the Text REtrieval Conference (TREC), with links to the other two major track series below. These tracks have sought to provide benchmark datasets and evaluate information retrieval systems focused on many of the most important information access problems in biomedicine.