In a study of 105 gastrointestinal carcinoid tumors, 67% of the rectal carcinoids and 15% of the carcinoids at other gastrointestinal sites were positive, immunohistochemically, for prostatic acid phosphatase activity. These findings are relevant to the differential diagnosis between rectal carcinoids and prostatic carcinoma.
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Sobin et al. (1986) studied this question.
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