ClinicalTrials.gov is a registry and results database of publicly and privately supported clinical studies of human participants conducted around the world. The site is maintained by the National Library of Medicine and the National Institutes of Health. This service lets you stay up-to-date on clinical trials around asthma, cancer, and diabetes. ClinicalTrials.gov gives you information about a trial's purpose, who may participate, locations, and phone numbers for more details. This information should be used in conjunction with advice from health care professionals.