A case of midgut carcinoid with breast metastasis is reported. Hepatic metastases stored large amounts of serotonin as demonstrated by the Falck-Hillarp technique. Immunocytochemically serotonin and substance P, which may co-exist in gut enterochromaffin cells, were demonstrated in separate populations of tumor cells both in the hepatic and mammary neoplasms.
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Ahlman et al. (1986) studied this question.
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