Physician Data Query (PDQ) is a National Cancer Institute (NCI) information resource that provides evidence-based summaries on cancer treatment, screening, prevention, genetics, and supportive care.
PDQ content is used by clinicians and researchers to reference current standards, emerging evidence, and trial information in oncology. In research settings, PDQ can support protocol background sections, investigator education, and rationale development for oncology studies. PDQ summaries are curated and regularly updated, improving reliability compared with non-reviewed sources. Using PDQ strengthens scientific consistency and helps align trial concepts with established oncology evidence.