Carcinomas originate in the epithelium, tissues that are formed by one or more layers of juxtaposed cells that line the cavities and canals of the body besides the skin, and also form the mucous glands. Mucosa, for example, the lining inside the mouth or nose. Any viscera, any duct or gland is formed, in large part by mucous ..
The epithelia are constantly regenerating: The epithelial cells have a short cell cycle, due to continuous wear to which they are subjected.
Most cancers originate in the epithelium and are called carcinomas. They are the most common malignant tumors such as breast, lung, colon, stomach and prostate.
If you look in the microscope the skin or mucosa, shows that all have a very similar structure. The cells are arranged in layers, one above the other. These layers of cells are always supported in a fibrous structure that supports them, called basal membrane, which is an important element for the diagnosis of cancer.
Carcinomas are always born in the layers of cells that are above the basement membrane. While the basement membrane remains intact, cancer is called carcinoma in situ. If it is not removed before the tumor just to break the basement membrane and grows downward into. At this moment, it is said that is infiltrating or invasive carcinoma.
Tags: basal, Cancer, Carcinoma, Epithelial cells, Mucosa
