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Definition of National Cancer Institute (NCI)
Medically reviewed by Min Clinic Staff | Updated: January 2026
National Cancer Institute (NCI): One of the National Institutes of Health (NIH) in the U.S., whose mission is to "lead a national effort to reduce the burden of cancer morbidity and mortality and ultimately to prevent the disease. Through basic and clinical biomedical research and training, NCI conducts and supports programs to understand the causes of cancer; prevent, detect, diagnose, treat, and control cancer; and disseminate information to the practitioner, patient, and public."