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Friday, April 15, 2011

Cancer Epidemiology

Cancer risk has changed. Cancer that was often found now rare.

For example in 1930 of stomach cancer in the U.S. 4 times more common than it is now. Perhaps this is because fewer people now consume foods that are smoked or pickled.

Meanwhile, the incidence of lung cancer in the U.S. in 1930 is 5 of every 100,000 people increased to 114 of every 100,000 in 1990, and it bounced high incidence in women. This change is almost certainly a result of increased use of cigarettes. Cigarette smoking also causes the increase in oral cancer.

Age is an important factor in the occurrence of cancer.
Some cancers, such as Wilms tumor, acute lymphocytic leukemia and Burkitt's lymphoma, a lot of attacking a young age. Why this happens is still not fully understood, but one of the factors that play a role is a genetic predisposition.

But the most prevalent cancer in the elderly.
Prostate cancer, stomach and colon, most likely occur after the age of 60 years.
In the U.S., more than 60% of cancers diagnosed in people aged over 65 years.
Overall, the risk of cancer in the U.S. increased 2-fold every 5 years after age 25 years.

Increased risk of cancer may be a combination of increased and increasing duration of exposure to carcinogens and the weakening of the immune system.

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