Abstract
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 RET gene mutations in the clinical management of affected gene carriers.
MeSH terms
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Adult
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Aged
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Calcitonin / blood*
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Carcinoma, Medullary / blood
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Carcinoma, Medullary / congenital*
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Carcinoma, Medullary / diagnosis
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Carcinoma, Medullary / genetics
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Child, Preschool
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Early Detection of Cancer / methods*
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False Negative Reactions
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Female
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Humans
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Male
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Middle Aged
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Multiple Endocrine Neoplasia Type 2a / blood
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Multiple Endocrine Neoplasia Type 2a / diagnosis*
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Multiple Endocrine Neoplasia Type 2a / genetics*
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Pentagastrin*
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Polymorphism, Single Nucleotide / genetics
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Proto-Oncogene Proteins c-ret / genetics*
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Thyroid Neoplasms / blood
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Thyroid Neoplasms / diagnosis*
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Thyroid Neoplasms / genetics*
Substances
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Calcitonin
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Proto-Oncogene Proteins c-ret
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RET protein, human
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Pentagastrin
Supplementary concepts
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Familial medullary thyroid carcinoma