This chapter discusses the contributions of migrant studies to cancer research. Migrant populations have contributed essential information to research on the etiology of cancer. Foremost, they have shown the dominant role of environmental factors in determining cancer risk. Because the direction and magnitude of change in incidence vary by cancer site for each migrant group, these studies support the view that the major risk factors for various cancer sites also differ. In some instances, migrant studies have provided information on critical periods of life when risk factors are most influential. They have also suggested useful etiologic hypotheses, particularly those related to lifestyle, especially diet.
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