Skin Cancer ? Ultraviolet Radiation Causes Epidermal Basal Cells

June 25th | Understanding Human Anatomy and Physiology

Skin cancer is classified as melanoma or nonmelanoma. Nonmelanoma cancers, including basal cell carcinoma and squamous cell carcinoma, are much less likely to metastasize than cancer melanoma. Basal cell carcinoma, the most common type of skin cancer, begins when ultraviolet radiation causes epidermal basal cells to form tumors, while at the same time the ability to suppress the immune system to detect the tumor. The signs of a tumor are varied. They include an open sore that does not heal a recurring reddish patches; a smooth, circular growth with a lip, bump bright, pale or trademark. About 95% of patients are easily cured by surgical removal of the tumor, but recurrence is common. Squamous cell carcinoma begins in the epidermis proper. While five times less common than basal cell carcinoma, it is more likely to spread to adjacent organs, and death occurs in approximately 1% of cases. Signs of squamous cell carcinoma are the same as those for basal cell carcinoma, except that it may also prove to be a wart that bleeds and crusts. Melanoma, the type that is most likely to be malignant, begins in melanocytes and has the appearance of a mole unusual. Unlike a normal mole, which is dark, circular, and confined, a mole melanoma looks like an ink blot reversed, and a mole melanoma can only display a wide variety of colors. A mole melanoma may also itch, hurt or feel numb. The skin around the mole becomes gray, white, or red. Melanoma is more common in fair skinned people, especially if they have suffered severe burns that children occasionally. The risk of melanoma increases with the number of moles a person. Most moles appear before the age of 14 years, and their appearance is linked to sun exposure. Melanoma rates have increased since the beginning of the century, but the incidence has doubled in the last decade. In 2002, approximately 54,000 cases of melanoma were diagnosed in the United States.

Related posts:

1. Basal Cell Carcinoma: Superficial Basal Cell Cancers
2. Keratoacanthomas: T H E Second Common Skin Cancer
3. Description ? Symptoms Cumulative Sun Exposure
4. ANAL CANAL ? Nine Cell Layersthe Basal Cells
5. Vulvar cancer ? Most Vulvar Cancers

Tags: cancer, Skin:

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