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Population-Based Studies
One way of identifying the
various causes of cancer is by
studying populations and
behaviors. This approach
compares cancer rates among
various groups of people
exposed to different factors or
exhibiting different behaviors. A
striking finding to emerge from
population studies is that cancers
arise with different frequencies in
different areas of the world. For
example, stomach cancer is
especially frequent in Japan,
colon cancer is prominent in the
United States, and skin cancer is
common in Australia. What is
the reason for the high rates of
specific kinds of cancer in
certain countries?
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