Rabu, 19 Oktober 2011

Physical agents


Some substances cause cancer primarily through their physical, rather than chemical, effects on cells.[27]
A prominent example of this is prolonged exposure to asbestos, naturally occurring mineral fibers which are a major cause of mesothelioma, a type of lung cancer.[27] Other substances in this category include both naturally occurring and synthetic asbestos-like fibers, such as wollastoniteattapulgiteglass wool, and rock wool, are believed to have similar effects.[27]
Nonfibrous particulate materials that cause cancer include powdered metallic cobalt and nickel, and crystalline silica (quartzcristobalite, and tridymite).[27]
Usually, physical carcinogens must get inside the body (such as through inhaling tiny pieces) and require years of exposure to develop cancer.[27

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