ectopic hormone

ectopic hormone
a hormone produced by cells that do not usually produce it. Some tumour cells secrete hormones; for example, small-cell lung cancer cells secrete antidiuretic hormone and cause hyponatraemia.

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a hormone released from a neoplasm or cells outside the usual source of the hormone. Such hormones may be useful as tumor markers. Cf. eutopic h.

Medical dictionary. 2011.

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