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Directory of Cancer Resources

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Cancer is the common term for tumors (neoplasms) characterized by uncontrolled growth. Unlike normal cells, cancer cells are atypical in structure and do not have specialized functions. They compete with normal cells for nutrients, eventually killing normal tissue. Cancerous, or malignant, tissue can remain localized, invading only neighboring tissue, or can spread to other tissues or organs via the lymphatic system or blood; virtually all tissues and organs are susceptible.

The branch of medicine concerned with diagnosis, treatment, and research into the causes of cancer is oncology.

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