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Knowledge about actual differences in cancer rates between countries and in changes over time can give important clues to:

  • Causes of cancer
  • Nutritional causes of cancer

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Trends over time in cancer incidence:

http://meddev.uio.no/elaring/lcms13/ernaeringslaere/nutr-cancer-epidemiology/illustrations/trends-09.JPG

Discussion question:

For each cancer type, what could be possible reasons for the changes in incidence over time?