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Questions About Cancer? 1-800-4-CANCER


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PDQ (Physician Data Query) is NCI's comprehensive cancer database. It contains summaries on a wide range of cancer topics; a registry of 8,000+ open and 19,000+ closed cancer clinical trials from around the world; and a directory of professionals who provide genetics services. PDQ also contains the NCI Dictionary of Cancer Terms, with definitions for 6,800+ cancer and medical terms, and the NCI Drug Dictionary, which has information on 2,300+ agents used in the treatment of cancer or cancer-related conditions.

PDQ (Physician Data Query)

Cancer Information Summaries

PDQ Editorial Boards

NCI Dictionaries

  • Dictionary of Cancer Terms
    A dictionary of 6,800+ cancer-related terms. This resource is updated monthly; new terms are reviewed by a multidisciplinary panel of reviewers, and approximately 30 terms are added each month.
  • NCI Dictionary of Genetics Terms
    A dictionary of more than 150 genetics-related terms written for healthcare professionals. This resource was developed to support the comprehensive, evidence-based, peer-reviewed PDQ cancer genetics information summaries.
  • NCI Drug Dictionary
    A dictionary that contains technical definitions, alternate names, and links to related information for 2,300+ agents that are being used in the treatment of patients with cancer or cancer-related conditions.

Clinical Trials

Cancer Genetics Services

Other Ways to Get PDQ Information

  • Content Dissemination Program
    Information about's content dissemination program, which makes cancer information available in XML format for use in Web sites and in other information products.