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The results of the analysis showed that a significant excess of tumours developed within the alimentary tract and that the excess was confined to the small intestine and pancreas (including ampulla of Vater). At each of these sites the observed number of tumours was very significantly in excess of expectation and, also, they de- veloped at a relatively early age compared with other sites within the digestive system. In contrast, the number of large bowel tuimours was close to expectation.
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Benn et al. (1972) studied this question.
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