posted by Tess on Jun 11
The question what causes cancer has been one of the most frustrating questions for scientists involved in cancer research. Despite huge amounts of funding and resource being spent on the subject, there is still an element of doubt behind what causes cancer. At the most we know what the risk factors are because most of the causes carry an element of doubt along with them.
An important risk factor behind the development of lung cancer in humans is cigarette smoking. But cigarette smoking does not cause cancer on its own because there is strong evidence of many heavy smokers who do not develop cancer. Genetic predisposition and a change in genetic messages caused by carcinogens combine to cause cancer. For example, age may be one factor that has been identified. This is because advancing age allows for a series of changes in the body that can lead to the transformation of normal cells into cancerous ones. Risk factors are important in as much as they have the ability to affect genes responsible for normal cell functioning.
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