Cross-sectional studies raise the possibility of protective relationships between, or a common mechanism underlying, the development of dementia of the Alzheimer type (DAT) and cancer. Using a prospective longitudinal design, the authors found that the risk of developing cancer is less among participants with DAT vs nondemented participants (p < 0.001) and that the risk of developing DAT may be less for participants with a history of cancer (p = 0.060).
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Roe et al. (2005) studied this question.
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