NCCN Member Institutions

The National Comprehensive Cancer Network (NCCN) is a not-for-profit alliance of 21 of the world’s leading cancer centers. We are dedicated to improving the quality and effectiveness of care provided to people with cancer.

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Term Definition
Tumor

An abnormal mass of tissue that results when cells divide more than they should or do not die when they should. Tumors may be benign (not cancerous), or malignant (cancerous). Also called neoplasm.
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