General Information About Breast Cancer | Johns Hopkins Medicine
https://www.hopkinsmedicine.org/health/conditions-and-diseases/breast-cancer/general-information-about-breast-cancer
WebWhat is a tumor? When cells divide when new cells are not needed, too much tissue is formed. This mass of extra tissue, called a tumor, can be benign or malignant. Benign tumors: Are not cancer. Can usually be removed. Are rarely a threat to life. Do not come back in most cases.
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