Physician Data Query (PDQ) by the National Cancer Institute (NCI)

Unrestricted Access


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.


Dates covered

Most recent information.

Updating frequency

As new information becomes available.


National Cancer Institute.

Type of coverage

Cancer information for both health professionals and patients/families.  It is organized by diagnosis and stage of cancer.  It offers information on treatments available and NCI protocol participants by geographic area.

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Producer/content provider

National Cancer Institute

Vendor/electronic presentation provider

National Cancer Institute