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Cutaneous squamous-cell carcinoma is the second-most common cancer of the skin (after basal-cell carcinoma, but more common than melanoma). It usually occurs in areas exposed to the sun. Sunlight exposure and immunosuppression are risk factors for SCC of the skin, with chronic sun exposure being the strongest environmental risk factor. [26]
Conditions of or affecting the human integumentary system associated with increased risk of nonmelanoma skin cancer Condition Squamous-cell carcinoma Basal-cell carcinoma; Xeroderma pigmentosum + + Oculocutaneous albinism + + Epidermodysplasia verruciformis + Recessive dystrophic epidermolysis bullosa + Ferguson–Smith syndrome + Muir–Torre ...
Basal-cell skin cancer (BCC), squamous-cell skin cancer (SCC), melanoma [1] Causes: Ultraviolet radiation from the Sun or tanning beds [4] Risk factors: Light skin, poor immune function [1] [5] Diagnostic method: Tissue biopsy [3] Prevention: Decreasing exposure to ultraviolet radiation, sunscreen [6] [7] Treatment: Surgery, radiation therapy ...
Squamous-cell carcinoma (SCC), also known as epidermoid carcinoma, comprises a number of different types of cancer that begin in squamous cells. [1] These cells form on the surface of the skin, on the lining of hollow organs in the body, and on the lining of the respiratory and digestive tracts .
A recent analysis of the Surveillance, Epidemiology and End Results (SEER) registry of the US National Cancer Institute has shown that squamous cell carcinoma accounts for approximately 75% of all vulvar cancers. [22] These lesions originate from epidermal squamous cells, the most common type of skin cell. Carcinoma-in-situ is a precursor ...
All squamous cell carcinoma lesions are thought to begin via the repeated, uncontrolled division of cancer stem cells of epithelial lineage or characteristics. Accumulation of these cancer cells causes a microscopic focus of abnormal cells that are, at least initially, locally confined within the specific tissue in which the progenitor cell resided.
Estimates place the worldwide risk of cancers from infectious causes at 16.1%. [1] Viral infections are risk factors for cervical cancer, 80% of liver cancers, and 15–20% of the other cancers. [2] This proportion varies in different regions of the world from a high of 32.7% in Sub-Saharan Africa to 3.3% in Australia and New Zealand. [1]
Radiation hormesis is the conjecture that a low level of ionizing radiation (i.e., near the level of Earth's natural background radiation) helps "immunize" cells against DNA damage from other causes (such as free radicals or larger doses of ionizing radiation), and decreases the risk of cancer. The theory proposes that such low levels activate ...