Failure of pentagastrin-stimulated calcitonin testing in early manifestation of familial medullary thyroid cancer.

Abstract excerpt

This case report describes three generations of a family with familial medullary thyroid cancer (RET gene mutation L790F). One of the three siblings-all of them carrier of the respective mutation-exhibited the absence of pathological basal and pentagastrin-stimulated calcitonin levels in spite of multifocal medullary thyroid microcancer. This case illustrates the challenge to consider the biological diversity of...

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