PDQ: the National Cancer Institute's computerized database for physicians.

Physician Data Query (PDG) is the National Cancer Institute's computerized database of current information regarding cancer treatment consisting of four major files: (1) a cancer information file providing prognostic and treatment information on all major cancers; (2) a protocol file containing investigational and standard therapy protocols; (3) a physician directory of 10,000 physicians devoting a major portion of their clinical practices to cancer treatment; and (4) a directory of approximately 2,000 organizations and institutions providing care to cancer patients. While PDQ's primary user group is practicing physicians requiring information for patient care, it can be of use to other health professionals. Searches are rapid, inexpensive, and can be performed through medical and hospital libraries, via individual direct accession, or in conjunction with other online vendors.