Carcinoma is a type of cancer that begins in epithelial tissue.
Understanding Carcinoma
Epithelial tissue is a widespread tissue type in the body that forms the lining of many organs, internal passageways, and the skin. Because of this, carcinomas are the most common type of cancer.
- Location: Epithelial tissue lines organs, internal passageways (like the esophagus), and the skin.
- Common Cancers: Many cancers affecting the skin, breasts, kidney, liver, lungs, pancreas, prostate gland, head, and neck are carcinomas.
Types of Carcinomas
While "carcinoma" is a general term, there are different types, each originating in specific epithelial cells:
- Adenocarcinoma: Forms in glandular epithelial cells that produce fluids or mucus.
- Squamous Cell Carcinoma: Develops in squamous epithelial cells, which are flat cells lining surfaces like the skin.
- Basal Cell Carcinoma: Originates in basal cells, found in the deepest layer of the epidermis (skin).
- Transitional Cell Carcinoma: Occurs in transitional epithelium, found in the lining of the bladder, ureters, and part of the urethra.
Examples of Carcinomas in Different Organs
| Organ | Common Carcinoma Type(s) |
|---|---|
| Skin | Basal Cell Carcinoma, Squamous Cell Carcinoma |
| Breast | Ductal Carcinoma, Lobular Carcinoma (both adenocarcinomas) |
| Lung | Adenocarcinoma, Squamous Cell Carcinoma, Small Cell Carcinoma, Large Cell Carcinoma |
| Prostate Gland | Adenocarcinoma |
