What Is Cancer? - NCI - National Cancer Institute
https://www.cancer.gov/about-cancer/understanding/what-is-cancer
WebOct 11, 2021 · Cancerous tumors may also be called malignant tumors. Many cancers form solid tumors, but cancers of the blood, such as leukemias, generally do not. Benign tumors do not spread into, or invade, nearby tissues. When removed, benign tumors usually don’t grow back, whereas cancerous tumors sometimes do.
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