Cancer.gov - This link takes you directly to the main search page on cancer.gov. Select the type of cancer, then select whether the trial is open or closed and the Protocol ID. You can also search for all available trials by entering in other applicable information and leaving the Protocol ID field empty.
ClinicalTrials.gov - The U.S. National Institutes of Health, through its National Library of Medicine, has developed ClinicalTrials.gov to provide patients, family members and members of the public current information about clinical research studies.