Word: epithelium
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Dates: during 1920-1929
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Definition. Cancer is one of three types of tumor growing in the epithelium, that is, the cellular tissue which covers the body's free-surfaces, and lines tubes and cavities. One of these three types grows in finger-like processes or ridges. It is called papilloma and is benign. Also benign is adenoma, which lines gland-like depressions or cavities in the tissue structure. Under certain conditions papilloma and adenoma may infiltrate into healthy tissues and sometimes displace them. Here they resemble in effect the third epithelial tumor type-carcinoma, or cancer...