Department of Anatomy and UMIB (Unit for Multidisciplinary Biomedical Research) of ICBAS, Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Department of Endocrinology, University of Porto, Porto, 4050-313, Portugal
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Department of Anatomy and UMIB (Unit for Multidisciplinary Biomedical Research) of ICBAS, Institute of Molecular Pathology and Immunology of the University of Porto (IPATIMUP), Department of Endocrinology, University of Porto, Porto, 4050-313, Portugal
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test the efficiency of this method. In testing for biomarkers, we performed immunohistochemical labeling of 11 different molecules, namely those involved in steroidogenesis (StAR), regulation of the cell cycle (p53, p21, MDM2, p27, and cyclin D1), cell
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syndrome are still to be defined. The CDKN1B gene encodes a nuclear protein named P27 (also known as KIP1), a member of the CDK inhibitors family. P27 regulates the transition of G1 phase to S phase by inhibiting the activity of CDKs and by promoting exit
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expression, suppressed cell growth and caused cell cycle arrest because of a p21 and p27 increase and a cyclin D1 degradation in neuroendocrine gastrointestinal and pulmonary carcinoid cells in vitro ( 172 ). In addition, VPA also suppressed growth of
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Réseau TenGen, Marseille, France
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Fédération d’Endocrinologie, Hospices Civils de Lyon, Université Lyon 1, France
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Service de Génétique, AP-HP, Hôpital européen Georges Pompidou, Paris, France
Université de Paris, PARCC, INSERM, Paris, France
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Laboratoire de Biochimie et Oncologie Moléculaire, CHU Lille, Lille, France
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Laboratoire de Génétique Moléculaire, CHU Lyon, Lyon, France
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Department of Endocrinology, Assistance Publique-Hôpitaux de Marseille (AP-HM), Hôpital de la Conception, Centre de Référence des Maladies Rares de l’hypophyse HYPO, Marseille, France
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Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER), Madrid, Spain
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Aix Marseille Univ, APHM, INSERM, MMG, Laboratory of Molecular Biology, Hospital La Conception, Marseille, France
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Department of Clinical Research, University of Southern Denmark, Odense, Denmark
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Objective
Multiple endocrine neoplasia type 2A (MEN 2A) is a rare syndrome caused by RET germline mutations and has been associated with primary hyperparathyroidism (PHPT) in up to 30% of cases. Recommendations on RET screening in patients with apparently sporadic PHPT are unclear. We aimed to estimate the prevalence of cases presenting with PHPT as first manifestation among MEN 2A index cases and to characterize the former cases.
Design and methods
An international retrospective multicenter study of 1085 MEN 2A index cases. Experts from MEN 2 centers all over the world were invited to participate. A total of 19 centers in 17 different countries provided registry data of index cases followed from 1974 to 2017.
Results
Ten cases presented with PHPT as their first manifestation of MEN 2A, yielding a prevalence of 0.9% (95% CI: 0.4–1.6). 9/10 cases were diagnosed with medullary thyroid carcinoma (MTC) in relation to parathyroid surgery and 1/10 was diagnosed 15 years after parathyroid surgery. 7/9 cases with full TNM data were node-positive at MTC diagnosis.
Conclusions
Our data suggest that the prevalence of MEN 2A index cases that present with PHPT as their first manifestation is very low. The majority of index cases presenting with PHPT as first manifestation have synchronous MTC and are often node-positive. Thus, our observations suggest that not performing RET mutation analysis in patients with apparently sporadic PHPT would result in an extremely low false-negative rate, if no other MEN 2A component, specifically MTC, are found during work-up or resection of PHPT.
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-dominant Autosomal-dominant Autosomal-dominant Autosomal-dominant Encoded protein Menin RET RET p27 MAX Leading tumor (prevalence %) PHPT (85%) Medullary thyroid cancer (95–100%) Medullary thyroid cancer (95–100%) PHPT (75
Department of Anatomy, Shanxi Medical University, Taiyuan, China
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( 20 , 21 ). The function of AKT in stimulating β-cell replication may occur via the activation of cell cycle regulators, such as Cyclin D2 , Cdk4 and p27Kip1 ( 22 , 23 , 24 ). In addition, the pancreatic transcription factor Foxo1 is a
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disruption of cellular functions. For instance, the expression of menin and its messenger molecules (mixed lineage leukemia (MLL), p27 and p18) in the pancreas and pituitary gland does not differ in MEN1+/− and WT mice ( 19 ). At the same time, in 2001 it
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reduction of P27 and inhibition of cyclin and CDK complexes, as well as a loss of control of cell cycle progression. Inactivating somatic and germline mutations of CDC73 are frequently identified in patients with parathyroid carcinoma. CDKN1B has been
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Parelsnoer Institute, Utrecht, The Netherlands
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Prognostic factors Subsequent questions What is the role of role p27Kip1 and p18Ink4c in pancreatic neuroendocrine tumor development in MEN1 patients? pNET Prognostic factors Subsequent questions What are promoter methylation profiles in
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.326T>G) and tumour multiplicity in MEN1 patients has been reported ( 41 ), although we did not observe any variants in Cdkn1b (encoding p27 kip1 ) in our WGS data, we did observe variants in the cell cycle regulator, Ccne2 , that is regulated by p27