Abstract
Hyperparathyroidism is defined as an excess of parathyroid hormone (PTH) level in blood, due to prolonged overactivity of one or more parathyroid glands. Primary hyperparathyroidism (PHPT) is caused by an idiopathic defect of parathyroid growth and/or activity, and it can manifest as sporadic disease or, rarely, within the context of complex genetic disorders (up to 10% of cases).
Genetic PHPT can manifest as isolated clinical manifestation (nonsyndromic inherited PHPT) or within specific syndromes in association with other endocrine and nonendocrine clinical manifestations (syndromic inherited PHPT). Nonsyndromic inherited PHPT includes familial isolated hyperparathyroidism (FIHPT), familial hypocalciuric hypercalcaemia (FHH), and neonatal severe primary hyperparathyroidism (NSPHPT). Genetic syndromes presenting PHPT include multiple endocrine neoplasia type 1 (MEN1), multiple endocrine neoplasia type 2A (MEN2A), multiple endocrine neoplasia type 4 (MEN4), and hyperparathyroidism-jaw tumor syndrome (HPT-JT). PHPT in these complex genetic disorders is inherited usually as an autosomal dominant tract by one affected parent, independently by sex, with a transmission risk of 50%. Penetrance, age of onset, and clinical characteristics of PHPT are variable, in mutation carriers, for each of these complex disorders. The clinical management of these PHPT varies considerably, thus, a differential diagnosis is important; genetic testing is a helpful tool.
Here we review the main clinical characteristics and genetic bases of all these genetic PHPT forms, as well as differential diagnosis and current available therapies.
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Marini, F., Giusti, F., Brandi, M.L. (2019). Hyperparathyroidism in Complex Genetic Disorders. In: Colao, A., Jaffrain-Rea, ML., Beckers, A. (eds) Polyendocrine Disorders and Endocrine Neoplastic Syndromes. Endocrinology. Springer, Cham. https://doi.org/10.1007/978-3-319-73082-0_15-1
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DOI: https://doi.org/10.1007/978-3-319-73082-0_15-1
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