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Бенина АР, Колодкина АА, Тюльпаков АН, Калинченко НЮ, Бровин ДН, Аникиев АВ, Даниленко ОС, Шеремета МС, Захарова ВВ, Солодовникова ЕН, Безлепкина ОБ. [Primary hyperparathyroidism in children]. PROBLEMY ENDOKRINOLOGII 2023; 70:74-82. [PMID: 39069775 PMCID: PMC11334229 DOI: 10.14341/probl13382] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 10/17/2023] [Accepted: 10/18/2023] [Indexed: 07/30/2024]
Abstract
BACKGROUND Primary hyperparathyroidism (PHPT) is an endocrine disorder characterized by excessive secretion of parathyroid hormone (PTH) with upper-normal or elevated blood calcium levels due to primary thyroid gland pathology. PHPT is a rare pathology in children, with a prevalence of 2-5:100,000 children according to the literature. Due to the non-specificity of clinical manifestations at onset (nausea, vomiting, abdominal pain, emotional lability), the disease may remain undiagnosed for a long time. AIM To study the features of the course and molecular genetic basis of primary hyperparathyroidism in children. MATERIALS AND METHODS Retrospective observational study of 49 patients diagnosed with primary hyperparathyroidism. All patients underwent a comprehensive laboratory-instrumental and molecular genetic study at the Institute of Pediatric Endocrinology, Endocrinology Research Center of Russia in the period 2014-2022. RESULTS The first clinical symptoms of PHPT were noted at the age of 13.8 years [10.6; 1 5.2], among which fatigue, headaches, dyspepsia, lower limb pain, and fractures were the most common. The age of diagnosis was 15.81 years [13.1; 16.8], all children were found to have high levels of PTH, total and ionized calcium, with hypophosphatemia in 93.9% of patients (n=46) and hypercalciuria in 43% (n=21). Five out of 49 patients (10.2%) were found to have ectopy of the thyroid: 3 showed an intrathyroidal location, 2 in the mediastinal region. Molecular genetic study revealed mutations in 32.7% of patients (n=16, CI (21; 47)), mutations in MEN1 being the most frequent (n=11). Pathogenic variants in CDC73 were detected in 3 patients, RET - in 2. Among the operated 39 patients, adenoma of the thyroid was detected in 84.6% of cases (n=33), hyperplasia in 7.7% (n=3), atypical adenoma in 5.1% (n=2), carcinoma in 5.1% of cases (n=2). CONCLUSION The paper presents the peculiarities of the course and the results of molecular genetic study of pediatric PHPT. This sample is the largest among those published in the Russian Federation.
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Affiliation(s)
- А. Р. Бенина
- Национальный медицинский исследовательский центр эндокринологии
| | - А. А. Колодкина
- Национальный медицинский исследовательский центр эндокринологии
| | - А. Н. Тюльпаков
- Медико-генетический научный центр имени академика Н.П. Бочкова;
Российская детская клиническая больница ФГАОУ ВО РНИМУ им. Н.И. Пирогова Минздрава России
| | | | - Д. Н. Бровин
- Национальный медицинский исследовательский центр эндокринологии
| | - А. В. Аникиев
- Национальный медицинский исследовательский центр эндокринологии
| | - О. С. Даниленко
- Национальный медицинский исследовательский центр эндокринологии
| | - М. С. Шеремета
- Национальный медицинский исследовательский центр эндокринологии
| | - В. В. Захарова
- Национальный медицинский исследовательский центр эндокринологии
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2
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Multiple endocrine neoplasia type 2: A reveiw. Semin Cancer Biol 2021; 79:163-179. [PMID: 33812987 DOI: 10.1016/j.semcancer.2021.03.035] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 03/13/2021] [Accepted: 03/27/2021] [Indexed: 12/16/2022]
Abstract
Multiple endocrine neoplasias are rare hereditary syndromes some of them with malignant potential. Multiple endocrine neoplasia type 2 (MEN 2) is an autosomal dominant hereditary cancer syndrome due to germline variants in the REarranged during Transfection (RET) proto-oncogene. There are two distinct clinical entities: MEN 2A and MEN 2B. MEN 2A is associated with medullary thyroid carcinoma (MTC), phaeochromocytoma, primary hyperparathyroidism, cutaneous lichen amyloidosis and Hirschprung's disease and MEN 2B with MTC, phaeochromocytoma, ganglioneuromatosis of the aerodigestive tract, musculoskeletal and ophthalmologic abnormalities. Germline RET variants causing MEN 2 result in gain-of-function; since the discovery of the genetic variants a thorough search for genotype-phenotype associations began in order to understand the high variability both between families and within family members. These studies have successfully led to improved risk classification of prognosis in relation to the genotype, thus improving the management of the patients by thorough genetic counseling. The present review summarizes the recent developments in the knowledge of these hereditary syndromes as well as the impact on clinical management, including genetic counseling, of both individual patients and families. It furthermore points to future directions of research for better clarification of timing of treatments of the various manifestations of the syndromes in order to improve survival and morbidity in these patients.
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Hansen AR, Borgwardt L, Rasmussen ÅK, Godballe C, Poulsen MM, Vieira FG, Mathiesen JS, Rossing M. Germline RET Leu56Met Variant Is Likely Not Causative of Multiple Endocrine Neoplasia Type 2. Front Endocrinol (Lausanne) 2021; 12:764512. [PMID: 34925234 PMCID: PMC8672160 DOI: 10.3389/fendo.2021.764512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 11/02/2021] [Indexed: 11/30/2022] Open
Abstract
Activating variants in the receptor tyrosine kinase REarranged during Transfection (RET) cause multiple endocrine neoplasia type 2 (MEN 2), an autosomal dominantly inherited cancer-susceptibility syndrome. The variant c.166C>A, p.Leu56Met in RET was recently reported in two patients with medullary thyroid cancer (MTC). The presence of a pheochromocytoma in one of the patients, suggested a possible pathogenic role of the variant in MEN 2A. Here, we present clinical follow up of a Danish RET Leu56Met cohort. Patients were evaluated for signs of MEN 2 according to a set of predefined criteria. None of the seven patients in our cohort exhibited evidence of MEN 2. Furthermore, we found the Leu56Met variant in our in-house diagnostic cohort with an allele frequency of 0.59%, suggesting that it is a common variant in the population. Additionally, none of the patients who harbored the allele were listed in the Danish MTC and MEN 2 registries. In conclusion, our findings do not support a pathogenic role of the Leu56Met variant in MEN 2.
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Affiliation(s)
- Anna Reimer Hansen
- Center for Genomic Medicine, Copenhagen University Hospital, Copenhagen, Denmark
| | - Line Borgwardt
- Center for Genomic Medicine, Copenhagen University Hospital, Copenhagen, Denmark
| | - Åse Krogh Rasmussen
- Department of Endocrinology and Metabolism, Copenhagen University Hospital, Copenhagen, Denmark
| | - Christian Godballe
- Department of Otorhinolaryngology, Head & Neck Surgery and Audiology, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Morten Møller Poulsen
- Department of Endocrinology and Internal Medicine, Aarhus University Hospital, Aarhus, Denmark
| | - Filipe G. Vieira
- Center for Genomic Medicine, Copenhagen University Hospital, Copenhagen, Denmark
| | - Jes Sloth Mathiesen
- Department of Otorhinolaryngology, Head & Neck Surgery and Audiology, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
| | - Maria Rossing
- Center for Genomic Medicine, Copenhagen University Hospital, Copenhagen, Denmark
- Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
- *Correspondence: Maria Rossing,
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Mathiesen JS, Nielsen SG, Rasmussen ÅK, Kiss K, Wadt K, Hermann AP, Nielsen MF, Larsen SR, Brusgaard K, Frederiksen AL, Godballe C, Rossing M. Variability in Medullary Thyroid Carcinoma in RET L790F Carriers: A Case Comparison Study of Index Patients. Front Endocrinol (Lausanne) 2020; 11:251. [PMID: 32411094 PMCID: PMC7198720 DOI: 10.3389/fendo.2020.00251] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 04/06/2020] [Indexed: 12/27/2022] Open
Abstract
Background: Previous studies have suggested that the variability in age of onset and aggressiveness of medullary thyroid carcinoma (MTC) in patients with multiple endocrine neoplasia type 2A (MEN 2A) carrying the same REarranged during Transfection (RET) mutation may be caused by additional RET germline variants or somatic variants. Methods: This study was a retrospective case comparison study of all MEN 2A index patients (n = 2) with the RET L790F germline mutation in Denmark. Whole blood and MTC tissue were analyzed for RET germline variants and other somatic variants (>500), respectively. Results: Patient 1 presented with MTC (T1aN1bM0) at age 14 years, while patient 2 presented with MTC (T1bN0M0) at age 70 years. No germline RET germline variants nor other variants were found to explain this MTC variability. Conclusions: We could not confirm the previously reported finding of a somatic RET variant as likely responsible for the early onset and aggressiveness of MTC in a RET germline mutation carrier. Also, we found no RET germline variants that could explain the MTC variability among our index patients. We did, however, identify a somatic FLT3 R387Q variant with an unknown potential as genetic modifier. Further large-scale studies are needed to investigate genetic modifiers in RET L790F carriers.
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Affiliation(s)
- Jes Sloth Mathiesen
- Department of ORL Head and Neck Surgery and Audiology, Odense University Hospital, Odense, Denmark
- Department of Clinical Research, University of Southern Denmark, Odense, Denmark
- *Correspondence: Jes Sloth Mathiesen
| | - Søren Grønlund Nielsen
- Department of ORL Head and Neck Surgery and Audiology, Odense University Hospital, Odense, Denmark
| | - Åse Krogh Rasmussen
- Department of Medical Endocrinology, Copenhagen University Hospital, Copenhagen, Denmark
| | - Katalin Kiss
- Department of Pathology, Copenhagen University Hospital, Copenhagen, Denmark
| | - Karin Wadt
- Department of Clinical Genetics, Copenhagen University Hospital, Copenhagen, Denmark
| | | | | | | | - Klaus Brusgaard
- Department of Clinical Genetics, Odense University Hospital, Odense, Denmark
| | | | - Christian Godballe
- Department of ORL Head and Neck Surgery and Audiology, Odense University Hospital, Odense, Denmark
| | - Maria Rossing
- Center for Genomic Medicine, Copenhagen University Hospital, Copenhagen, Denmark
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Veyrat-Durebex C, Bouzamondo N, Le Mao M, Chao de la Barca JM, Bris C, Dieu X, Simard G, Gadras C, Tessier L, Drui D, Borson-Chazot F, Barlier A, Reynier P, Prunier-Mirebeau D. Metabolomics signatures of a subset of RET variants according to their oncogenic risk level. Endocr Relat Cancer 2019; 26:379-389. [PMID: 30653460 DOI: 10.1530/erc-18-0314] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 01/17/2019] [Indexed: 12/11/2022]
Abstract
Thirty percent of medullary thyroid carcinomas (MTCs) are related to dominant germline pathogenic variants in the RET proto-oncogene. According to their aggressiveness, these pathogenic variants are classified in three risk levels: 'moderate', 'high' and 'highest'. The present study compares the metabolomics profiles of five pathogenic variants, whether already classified or not. We have generated six stable murine fibroblast cell lines (NIH3T3) expressing the WT allele or variants of the human RET gene, with different levels of pathogenicity, including the M918V variant that is yet to be accurately classified. We carried out a targeted metabolomics study of the cell extracts with a QTRAP mass spectrometer, using the Biocrates Absolute IDQ p180 kit, which allows the quantification of 188 endogenous molecules. The data were then subjected to multivariate statistical analysis. One hundred seventy three metabolites were accurately measured. The metabolic profiles of the cells expressing the RET variants were found to be correlated with their oncogenic risk. In addition, the statistical model we constructed for predicting the oncogenic risk attributed a moderate risk to the M918V variant. Our results indicate that metabolomics may be useful for characterizing the pathogenicity of the RET gene variants and their levels of aggressiveness.
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Affiliation(s)
- Charlotte Veyrat-Durebex
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
- Equipe Mitolab, Institut MITOVASC, Unité Mixte de Recherche CNRS 6214, INSERM U1083, Université d'Angers, Angers, France
| | | | - Morgane Le Mao
- Equipe Mitolab, Institut MITOVASC, Unité Mixte de Recherche CNRS 6214, INSERM U1083, Université d'Angers, Angers, France
| | - Juan Manuel Chao de la Barca
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
- Equipe Mitolab, Institut MITOVASC, Unité Mixte de Recherche CNRS 6214, INSERM U1083, Université d'Angers, Angers, France
| | - Céline Bris
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
- Equipe Mitolab, Institut MITOVASC, Unité Mixte de Recherche CNRS 6214, INSERM U1083, Université d'Angers, Angers, France
| | - Xavier Dieu
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Gilles Simard
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Cédric Gadras
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Lydie Tessier
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
| | - Delphine Drui
- Service d'Endocrinologie, CHU de Nantes, Nantes, France
| | - Françoise Borson-Chazot
- Hospices Civils de Lyon, Fédération d'Endocrinologie, Université Lyon 1, HESPER EA 7425, Lyon, France
| | - Anne Barlier
- Aix-Marseille University, CNRS, CRN2M, UMR 7286, and APHM La Conception Hospital, Molecular Biology Laboratory, Marseille, France
| | - Pascal Reynier
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
- Equipe Mitolab, Institut MITOVASC, Unité Mixte de Recherche CNRS 6214, INSERM U1083, Université d'Angers, Angers, France
| | - Delphine Prunier-Mirebeau
- Département de Biochimie et Génétique, CHU d'Angers, Angers, France
- Equipe Mitolab, Institut MITOVASC, Unité Mixte de Recherche CNRS 6214, INSERM U1083, Université d'Angers, Angers, France
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6
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Mathiesen JS, van Overeem Hansen T, Rasmussen ÅK, Hjortshøj TD, Kiss K, Larsen SR, Krogh LN, Frederiksen AL, Hermann AP, Godballe C. Novel Somatic RET Mutation Questioning the Causality of the RET I852M Germline Sequence Variant in Multiple Endocrine Neoplasia 2A. Thyroid 2017; 27:1103-1104. [PMID: 28578594 DOI: 10.1089/thy.2017.0131] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jes Sloth Mathiesen
- 1 Department of ORL Head and Neck Surgery, Odense University Hospital , Odense, Denmark
- 2 Institute of Clinical Research, University of Southern Denmark , Odense, Denmark
| | | | - Åse Krogh Rasmussen
- 4 Department of Medical Endocrinology, Copenhagen University Hospital , Copenhagen, Denmark
| | | | - Katalin Kiss
- 6 Department of Pathology, Copenhagen University Hospital , Copenhagen, Denmark
| | | | | | | | | | - Christian Godballe
- 1 Department of ORL Head and Neck Surgery, Odense University Hospital , Odense, Denmark
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Spitschak A, Meier C, Kowtharapu B, Engelmann D, Pützer BM. MiR-182 promotes cancer invasion by linking RET oncogene activated NF-κB to loss of the HES1/Notch1 regulatory circuit. Mol Cancer 2017; 16:24. [PMID: 28122586 PMCID: PMC5267421 DOI: 10.1186/s12943-016-0563-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/28/2016] [Indexed: 02/08/2023] Open
Abstract
Background Dominant-activating mutations in the RET proto-oncogene, a receptor tyrosine kinase, are responsible for the development of medullary thyroid carcinoma (MTC) and causative for multiple endocrine neoplasia (MEN) type 2A and 2B. These tumors are highly aggressive with a high propensity for early metastasis and chemoresistance. This attribute makes this neoplasia an excellent model for probing mechanisms underlying cancer progression. Methods The expression level of miR-182 was measured in MTC tumor specimens and in TT cells by real-time RT-PCR. TT cells and modified NThy-ori 3.1 that stably express RETM918T were used to investigate RET-dependent regulation of miR-182. Identification and validation of miR-182 targets and pathways was accomplished with luciferase assays, qRT-PCR, Western blotting and immunofluorescence. In vitro, overexpression and knockdown experiments were carried out to examine the impact of miR-182 and HES1 on invasion and migration. Results We found that miR-182 expression is significantly upregulated in MTC patient samples and tumor-derived cell lines harboring mutated RET. Inhibition of RET oncogenic signaling through a dominant-negative RET∆TK mutant in TT cells reduces miR-182, whereas overexpression of RETM918T in NThy-ori 3.1 cells increases miR-182 levels. We further show that overexpression of this miRNA in NThy.miR-182 cells promotes the invasive and migratory properties without affecting cell proliferation. MiR-182 is upregulated after RET induced NF-κB translocation into the nucleus via binding of NF-κB to the miR-182 promoter. Database analysis revealed that HES1, a repressor of the Notch pathway, is a target of miR-182, whose upregulation correlates with loss of HES1 transcription in MTC tissue samples and mutant RET cell lines. Moreover, we demonstrated that the 3′UTR of the HES1 mRNA bearing the targeting sequence for miR-182 clearly reduced luciferase reporter activity in cells expressing miR-182. Decreased expression of HES1 promotes migration by upregulating Notch1 inhibitor Deltex1 and consequent repression of Notch1. Conclusion We demonstrate a novel mechanism for MTC aggressiveness in which mutated RET/NF-κB-driven expression of miR-182 impedes HES1 activation in a negative feedback loop. This observation might open new possibilities to treat RET oncogene associated metastatic cancer. Electronic supplementary material The online version of this article (doi:10.1186/s12943-016-0563-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Alf Spitschak
- Institute of Experimental Gene Therapy and Cancer Research, Rostock University Medical Center, Schillingallee 69, 18057, Rostock, Germany
| | - Claudia Meier
- Institute of Experimental Gene Therapy and Cancer Research, Rostock University Medical Center, Schillingallee 69, 18057, Rostock, Germany
| | - Bhavani Kowtharapu
- Current address: Department of Ophthalmology, Rostock University Medical Center, Rostock, Germany
| | - David Engelmann
- Institute of Experimental Gene Therapy and Cancer Research, Rostock University Medical Center, Schillingallee 69, 18057, Rostock, Germany
| | - Brigitte M Pützer
- Institute of Experimental Gene Therapy and Cancer Research, Rostock University Medical Center, Schillingallee 69, 18057, Rostock, Germany.
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Joshi RR, Heineman TE, Kutler DI, Cohen MA, Kuhel WI. Multiple endocrine neoplasia type 2 kindred with novel tandem RET mutations: Case report with an applied in silico mutational tolerance analysis. Head Neck 2016; 38 Suppl 1:E1881-5. [PMID: 26876062 DOI: 10.1002/hed.24340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Accepted: 10/17/2015] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The American Thyroid Association (ATA) has established guidelines for prophylactic thyroidectomy in multiple endocrine neoplasia type 2A (MEN2A) based on rearranged during transfection (RET) mutations. In silico analysis, which uses computer modeling to predict alterations in protein structure, is a new method for studying these mutations. METHODS We describe a kindred with MEN2A, all sharing a well-documented RET mutation, p.C634Y, as well as a mutation of undetermined significance, p.I852M, which we analyzed via in silico analysis. RESULTS The p.C634Y mutation resulted in severe predicted RET alterations, whereas the p.I852M resulted in only modest changes. Both mutations together resulted in only a small additional disruptive effect in protein structure beyond that which occurred with p.C634Y alone. CONCLUSION Although in silico analysis may be helpful in quantitating changes in protein structure that occur in patients who have novel RET mutations (single or multiple), additional factors must account for the highly variable aggressiveness of the disease (C-cell hyperplasia/medullary thyroid carcinoma [MTC]) noted in our kindred. © 2016 Wiley Periodicals, Inc. Head Neck 38: E1881-E1885, 2016.
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Affiliation(s)
- Rohan R Joshi
- Weill Cornell Medical College/NewYork Presbyterian Hospital, Department of Otolaryngology-Head and Neck Surgery, New York, New York
| | - Thomas E Heineman
- University of California Los Angeles, Department of Otolaryngology-Head and Neck Surgery, Los Angeles, CA
| | - David I Kutler
- Weill Cornell Medical College/NewYork Presbyterian Hospital, Department of Otolaryngology-Head and Neck Surgery, New York, New York
| | - Marc A Cohen
- Weill Cornell Medical College/NewYork Presbyterian Hospital, Department of Otolaryngology-Head and Neck Surgery, New York, New York
| | - William I Kuhel
- Weill Cornell Medical College/NewYork Presbyterian Hospital, Department of Otolaryngology-Head and Neck Surgery, New York, New York
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Pappa T. The role of genetic screening in medullary thyroid cancer: a clinician's view on the recent ATA guidelines. Expert Rev Endocrinol Metab 2015; 10:345-347. [PMID: 30293499 DOI: 10.1586/17446651.2015.1057121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The American Thyroid Association recently released its revised guidelines on the management of medullary thyroid carcinoma. This editorial highlights the American Thyroid Association recommendations on genetic screening for medullary thyroid carcinoma and briefly discusses the future perspectives from the clinician's standpoint.
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Affiliation(s)
- Theodora Pappa
- a Thyroid Study Unit, Section of Endocrinology, Diabetes and Metabolism, The University of Chicago, Chicago, IL, USA
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10
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Abstract
We describe a case of recurrent primary hyperparathyroidism, manifested as 3 metachronous parathyroid adenomata, in a 50 year-old woman who also had Hashimoto hypothyroidism, gastric gastrointestinal stromal tumour (GIST), cysts in liver and kidneys, 5 intestinal polyps (one of these a villous adenoma), diverticulitis and telangiectasia of lips. She did not have medullary thyroid carcinoma (MTC). Genetic analysis of the CDC73 gene [for Hyperparathyroidism-jaw tumor (HPT-JT)], MEN1 for Multiple Endocrine Neoplasia Type1, CDKN1B for MEN4, SDHB and SDHD for Paraganglioma/Pheochromocytoma susceptibility, VHL for von Hippel-Lindau Syndrome, BMPR1A and SMAD4 for Juvenile Polyposis Syndrome (JPS) (sequencing and MLPA), karyotype and array CGH (44 K) were all normal. She was found to be homozygous for a synonomous germline variant in exon 14 (p. Ser836Ser) of the RET oncogene. This RET variant is of unclear clinical significance, and has been previously reported both in normal individuals and in individuals with MTC. It is unlikely that homozygosity for the RET variant has been casual in the multiple pathologies that our patient has developed.
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11
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Abstract
Medullary thyroid cancer (MTC) accounts for ~10% of thyroid carcinomas and occurs in sporadic and hereditary forms. Early diagnosis significantly impacts the clinical course, management and outcome of the disease. The identification of germline-activating mutations of the rearranged during transfection oncogene in patients with hereditary MTC led to significant progress in the diagnostic and therapeutic approach, thus improving the quality of care provided, and consequently, disease prognosis. In the present review, various aspects of genetic screening (GS) in MTC will be covered, which elucidate the value of GS in guiding clinical decision making, therapy selection and appropriate genetic counseling of the affected families. GS should be offered to every MTC patient, based on the personal and family medical history, to allow optimal clinical management and follow-up.
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Affiliation(s)
- Theodora Pappa
- a Department of Medical Therapeutics, Endocrine Unit, Athens University School of Medicine, Alexandra Hospital, Athens, Greece
| | - Maria Alevizaki
- a Department of Medical Therapeutics, Endocrine Unit, Athens University School of Medicine, Alexandra Hospital, Athens, Greece
- b Department of Endocrinology, Metabolism and Diabetes, Athens University School of Medicine, Evgenideion Hospital, Athens, Greece
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Elisei R, Alevizaki M, Conte-Devolx B, Frank-Raue K, Leite V, Williams G. 2012 European thyroid association guidelines for genetic testing and its clinical consequences in medullary thyroid cancer. Eur Thyroid J 2013; 1:216-31. [PMID: 24783025 PMCID: PMC3821492 DOI: 10.1159/000346174] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 11/30/2012] [Indexed: 01/09/2023] Open
Abstract
Twenty-five percent of medullary thyroid cancers (MTC) are familial and inherited as an autosomal dominant trait. Three different phenotypes can be distinguished: multiple endocrine neoplasia (MEN) types 2A and 2B, in which the MTC is associated with other endocrine neoplasias, and familial MTC (FMTC), which occurs in isolation. The discovery that germline RET oncogene activating mutations are associated with 95-98% of MEN 2/FMTC syndromes and the availability of genotyping to identify mutations in affected patients and their relatives has revolutionized the diagnostic and therapeutic strategies available for the management of these patients. All patients with MTC, both those with a positive familial history and those apparently sporadic, should be submitted to RET genetic screening. Once an RET mutation has been confirmed in an index patient, first-degree relatives should be screened rapidly to identify the 50% who inherited the mutation and are therefore at risk for development of MTC. Relatives in whom no RET mutation is identified can be reassured and discharged from further follow-up, whereas RET-positive subjects (i.e. gene carriers) must be investigated and a therapeutic strategy initiated. These guideline recommendations are derived from the most recent studies identifying phenotype-genotype correlations following the discovery of causative RET gene mutations in MEN 2 eighteen years ago. Three major points will be discussed: (a) identification of patients and relatives who should have genetic screening for RET mutations, (b) management of asymptomatic gene carriers, and (c) ethics.
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Affiliation(s)
- R. Elisei
- Department of Endocrinology and Metabolism, University of Pisa, Pisa, Italy
- *Dr. Rossella Elisei, Department of Endocrinology, University of Pisa, Via Paradisa 2, IT–56124 Pisa (Italy), E-Mail
| | - M. Alevizaki
- Endocrine Unit, Department of Medical Therapeutics, Athens University School of Medicine, Athens, Greece
| | - B. Conte-Devolx
- Department of Endocrinology, La Timone Hospital, Aix Marseille University, Marseille, France
| | - K. Frank-Raue
- Endocrine Practice, Molecular Laboratory, Heidelberg, Germany
| | - V. Leite
- Department of Endocrinology, Portuguese Institute of Oncology and CEDOC, Faculty of Medical Sciences, Lisbon, Portugal
| | - G.R. Williams
- Molecular Endocrinology Group, Department of Medicine, Hammersmith Hospital, Imperial College London, London, UK
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Abstract
Incremental advances in medical technology, such as the development of sensitive hormonal assays for routine clinical care, are the drivers of medical progress. This principle is exemplified by the creation of the concept of multiple endocrine neoplasia type 2, encompassing medullary thyroid cancer, pheochromocytoma, and primary hyperparathyroidism, which did not emerge before the early 1960s. This review sets out to highlight key achievements, such as joint biochemical and DNA-based screening of individuals at risk of developing multiple endocrine neoplasia type 2, before casting a spotlight on current challenges which include: (i) ill-defined upper limits of calcitonin assays for infants and young children, rendering it difficult to implement the biochemical part of the integrated DNA-based/biochemical concept; (ii) our increasingly mobile society in which different service providers are caring for one individual at various stages in the disease process. With familial relationships disintegrating as a result of geographic dispersion, information about the history of the origin family may become sketchy or just unavailable. This is when DNA-based gene tests come into play, confirming or excluding an individual's genetic predisposition to multiple endocrine neoplasia type 2 even before there is any biochemical or clinical evidence of the disease. However, the unrivaled molecular genetic progress in multiple endocrine neoplasia type 2 does not come without a price. Screening may uncover unknown gene sequence variants representing either harmless polymorphisms or pathogenic mutations. In this setting, functional characterization of mutant cells in vitro may generate helpful ancillary evidence with regard to the pathogenicity of gene variants in comparison with established mutations.
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Affiliation(s)
- Andreas Machens
- Department of General, Visceral and Vascular Surgery, Martin-Luther-University Halle-Wittenberg, Halle, Germany.
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