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Silvia Ciancia Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium

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Vanessa Dubois Basic and Translational Endocrinology (BaTE), Department of Basic and Applied Medical Sciences, Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium

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Martine Cools Department of Internal Medicine and Pediatrics, Ghent University, Pediatric Endocrinology Service, Ghent University Hospital, Ghent, Belgium

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Both in the United States and Europe, the number of minors who present at transgender healthcare services before the onset of puberty is rapidly expanding. Many of those who will have persistent gender dysphoria at the onset of puberty will pursue long-term puberty suppression before reaching the appropriate age to start using gender-affirming hormones. Exposure to pubertal sex steroids is thus significantly deferred in these individuals. Puberty is a critical period for bone development: increasing concentrations of estrogens and androgens (directly or after aromatization to estrogens) promote progressive bone growth and mineralization and induce sexually dimorphic skeletal changes. As a consequence, safety concerns regarding bone development and increased future fracture risk in transgender youth have been raised. We here review published data on bone development in transgender adolescents, focusing in particular on differences in age and pubertal stage at the start of puberty suppression, chosen strategy to block puberty progression, duration of puberty suppression, and the timing of re-evaluation after estradiol or testosterone administration. Results consistently indicate a negative impact of long-term puberty suppression on bone mineral density, especially at the lumbar spine, which is only partially restored after sex steroid administration. Trans girls are more vulnerable than trans boys for compromised bone health. Behavioral health measures that can promote bone mineralization, such as weight-bearing exercise and calcium and vitamin D supplementation, are strongly recommended in transgender youth, during the phase of puberty suppression and thereafter.

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Trine Holm Johannsen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Jakob Albrethsen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Vassos Neocleous The Cyprus Institute of Neurology and Genetics, Department of Molecular Genetics, Function and Therapy, Nicosia, Cyprus

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Federico Baronio S. Orsola-Malpighi University Hospital, Department of Medical and Surgical Sciences, Bologna, Italy

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Martine Cools Department of Pediatrics, Division of Pediatric Endocrinology, Ghent University Hospital and Department of Internal Medicine and Pediatrics, Ghent University, Ghent, Belgium

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Lise Aksglaede Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Niels Jørgensen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Peter Christiansen Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Meropi Toumba The Cyprus Institute of Neurology and Genetics, Department of Molecular Genetics, Function and Therapy, Nicosia, Cyprus
Pediatric Endocrinology Clinic, Department of Pediatrics, Aretaeio Hospital, Nicosia, Cyprus

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Pavlos Fanis The Cyprus Institute of Neurology and Genetics, Department of Molecular Genetics, Function and Therapy, Nicosia, Cyprus

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Marie Lindhardt Ljubicic Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark

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Anders Juul Department of Growth and Reproduction, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark
International Centre for Research and Research Training in Endocrine Disruption of Male Reproduction and Child Health (EDMaRC), Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
Department of Clinical Medicine, University of Copenhagen, Denmark

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Congenital adrenal hyperplasia (CAH) is a recessive condition that affects the adrenal glands. Despite life-long replacement therapy with glucocorticoids and mineralocorticoids, adult patients with CAH often experience impaired gonadal function. In pubertal boys and in men with CAH, circulating testosterone is produced by the adrenal glands as well as the testicular, steroidogenic cells. In this European two-center study, we evaluated the function of Leydig and Sertoli cells in 61 boys and men with CAH, primarily due to 21-hydroxylase deficiency. Despite conventional hormone replacement therapy, our results indicated a significant reduction in serum concentrations of both Leydig cell-derived hormones (i.e. insulin-like factor 3 (INSL3) and testosterone) and Sertoli cell-derived hormones (i.e. inhibin B and anti-Müllerian hormone) in adult males with CAH. Serum concentrations of INSL3 were particularly reduced in those with testicular adrenal rest tumors. To our knowledge, this is the first study to evaluate circulating INSL3 as a candidate biomarker to monitor Leydig cell function in patients with CAH.

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Hanna F Nowotny Medizinische Klinik IV, Department of Endocrinology, Klinikum der Universität München, Munich, Germany

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Jillian Bryce Office for Rare Conditions, University of Glasgow, Glasgow, UK

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Salma R Ali Office for Rare Conditions, University of Glasgow, Glasgow, UK

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Roberta Giordano Department of Clinical and Biological Sciences, University of Turin, Turin, Italy
Division of Endocrinology, Diabetes and Metabolism, Department of Medical Sciences, University of Turin, Turin, Italy

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Federico Baronio Pediatric Unit, Department Hospital of Woman and Child, Endo-ERN Centre IT11, IRCSS AOU S.Orsola-Malpighi University Hospital, Bologna, Italy

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Irina Chifu Division of Endocrinology and Diabetology, Department of Internal Medicine I, University Hospital of Wuerzburg, University of Wuerzburg, Wuerzburg, Germany

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Lea Tschaidse Medizinische Klinik IV, Department of Endocrinology, Klinikum der Universität München, Munich, Germany

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Martine Cools Department of Paediatric Endocrinology, Ghent University Hospital, University of Ghent, Ghent, Belgium

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Erica LT van den Akker Department of Pediatrics, Division of Pediatric Endocrinology, Erasmus MC - Sophia Children’s Hospital, Erasmus University Medical Center, Rotterdam, The Netherlands

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Henrik Falhammar Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden
Department of Endocrinology, Karolinska University Hospital, Stockholm, Sweden

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Natasha M Appelman-Dijkstra Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands

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Luca Persani Department of Endocrine and Metabolic Diseases, Istituto Auxologico Italiano IRCCS, Milan, Italy
Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan Italy

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Guglielmo Beccuti Department of Clinical and Biological Sciences, University of Turin, Turin, Italy

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Ian L Ross Division of Endocrinology, Department of Medicine, University of Cape Town, Cape Town, South Africa

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Simona Grozinsky-Glasberg Neuroendocrine Tumor Unit, ENETS Center of Excellence, Department of Endocrinology and Metabolism, Hadassah Medical Organisation and Faculty of Medicine, the Hebrew University, Jerusalem, Israel

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Alberto M Pereira Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands

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Eystein S Husebye Department of Clinical Science and KG Jebsen Center for Autoimmune Disorders, University of Bergen, Bergen, Norway
Department of Medicine, Haukeland University Hospital, Bergen, Norway
Department of Medicine, Karolinska Institutet, Stockholm, Sweden

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Stefanie Hahner Division of Endocrinology and Diabetology, Department of Internal Medicine I, University Hospital of Wuerzburg, University of Wuerzburg, Wuerzburg, Germany

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S Faisal Ahmed Office for Rare Conditions, University of Glasgow, Glasgow, UK
Department of Medicine, Division of Endocrinology, Leiden University Medical Center, Leiden, The Netherlands
Developmental Endocrinology Research Group, University of Glasgow, Glasgow, United Kingdom

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Nicole Reisch Medizinische Klinik IV, Department of Endocrinology, Klinikum der Universität München, Munich, Germany

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Background

Information on clinical outcomes of coronavirus disease 19 (COVID-19) infection in patients with adrenal disorders is scarce.

Methods

A collaboration between the European Society of Endocrinology (ESE) Rare Disease Committee and European Reference Network on Rare Endocrine Conditions via the European Registries for Rare Endocrine Conditions allowed the collection of data on 64 cases (57 adrenal insufficiency (AI), 7 Cushing’s syndrome) that had been reported by 12 centres in 8 European countries between January 2020 and December 2021.

Results

Of all 64 patients, 23 were males and 41 females (13 of those children) with a median age of 37 and 51 years. In 45/57 (95%) AI cases, COVID-19 infection was confirmed by testing. Primary insufficiency was present in 45/57 patients; 19 were affected by Addison’s disease, 19 by congenital adrenal hyperplasia and 7 by primary AI (PAI) due to other causes. The most relevant comorbidities were hypertension (12%), obesity (n = 14%) and diabetes mellitus (9%). An increase by a median of 2.0 (IQR 1.4) times the daily replacement dose was reported in 42 (74%) patients. Two patients were administered i.m. injection of 100 mg hydrocortisone, and 11/64 were admitted to the hospital. Two patients had to be transferred to the intensive care unit, one with a fatal outcome. Four patients reported persistent SARS-CoV-2 infection, all others complete remission.

Conclusion

This European multicentre questionnaire is the first to collect data on the outcome of COVID-19 infection in patients with adrenal gland disorders. It suggests good clinical outcomes in case of duly dose adjustments and emphasizes the importance of patient education on sick day rules.

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Luca Persani Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy
Department of Endocrinology and Metabolic Diseases, IRCCS Istituto Auxologico Italiano, Milan, Italy

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Martine Cools Departments of Internal Medicine and Paediatrics and of Paediatric Endocrinology, Ghent University Hospital, Ghent, Belgium

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Stamatina Ioakim Department of Medical Biotechnology and Translational Medicine, University of Milan, Milan, Italy

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S Faisal Ahmed Developmental Endocrinology Research Group, School of Medicine, Dentistry & Nursing, University of Glasgow, Glasgow, United Kingdom

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Silvia Andonova National Genetic Laboratory, UHOG “Maichin dom", Medical University, Sofia, Bulgaria

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Magdalena Avbelj-Stefanija Department for Pediatric Endocrinology, Diabetes and Metabolic Diseases, University Children's Hospital, University Medical Centre Ljubljana, Ljubljana, Slovenia

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Federico Baronio Pediatric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy

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Jerome Bouligand Université Paris-Saclay, Inserm UMRS1185 & Service de Génétique Moléculaire, Pharmacogénétique et Hormonologie, Hôpital Bicêtre, France

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Hennie T Bruggenwirth Department of Clinical Genetics, Erasmus MC, University Medical Center, Rotterdam, The Netherlands

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Justin H Davies Faculty of Medicine, University of Southampton, Southampton, United Kingdom

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Elfride De Baere Departments of Internal Medicine and Paediatrics and of Paediatric Endocrinology, Ghent University Hospital, Ghent, Belgium

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Iveta Dzivite-Krisane Children’s University Hospital, Riga, Latvia

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Paula Fernandez-Alvarez Department of Clinical and Molecular Genetics, Vall d'Hebron University Hospital, Barcelona, Spain

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Alexander Gheldof Center for Medical Genetics, Vrije Universiteit Brussel, Universitair Ziekenhuis Brussel, Brussels, Belgium

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Claudia Giavoli Unit of Endocrinology, Fondazione IRCCS Ospedale Maggiore Policlinico, Milano, Italy
Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy

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Claus H Gravholt Departments of Endocrinology, of Clinical Medicine and of Molecular Medicine, Aarhus University, Aarhus, Denmark

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Olaf Hiort University Hospital Schleswig-Holstein, Campus Lübeck, and University of Lübeck, Lübeck, Germany

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Paul-Martin Holterhus University Hospital Schleswig-Holstein, Campus Kiel, Kiel, Germany

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Anders Juul Departments of Growth and Reproduction and of Clinical Medicine, Copenhagen University Hospital – Rigshospitalet, Copenhagen, Denmark

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Csilla Krausz Endocrinology and Andrology Units, University Hospital of Careggi and Department of Experimental and Clinical Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy

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Kristina Lagerstedt-Robinson Department of Clinical Genetics, Karolinska University Laboratory, Karolinska University Hospital, Stockholm, Sweden

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Ruth McGowan Developmental Endocrinology Research Group, School of Medicine, Dentistry & Nursing, University of Glasgow, Glasgow, United Kingdom
West of Scotland Centre for Genomic Medicine, Queen Elizabeth University Hospital, Glasgow, United Kingdom

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Uta Neumann Charité Medicine University, Berlin, Germany

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Antonio Novelli Translational Cytogenomics Research Unit, Bambino Gesù Children's Hospital IRCCS, Rome, Italy

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Xavier Peyrassol Universitè Libre di Bruxelles, Brussels, Belgium

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Leonidas A Phylactou Cyprus Institute of Neurology and Genetics, Nicosia, Cyprus

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Julia Rohayem University Hospital Münster, Munster, Germany

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Philippe Touraine Center for Rare Endocrine and Gynecological Disorders, Department of endocrinology and reproductive Medicine, Hospital Pitié Salpêtrière, Paris, France

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Dineke Westra Department of Human Genetics, Radboud University Medical Center, Nijmegen, The Netherlands

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Valeria Vezzoli Department of Endocrinology and Metabolic Diseases, IRCCS Istituto Auxologico Italiano, Milan, Italy

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Raffaella Rossetti Department of Endocrinology and Metabolic Diseases, IRCCS Istituto Auxologico Italiano, Milan, Italy

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Differences of sex development and maturation (SDM) represent a heterogeneous puzzle of rare conditions with a large genetic component whose management and treatment could be improved by an accurate classification of underlying molecular conditions, and next-generation sequencing (NGS) should represent the most appropriate approach. Therefore, we conducted a survey dedicated to the use and potential outcomes of NGS for SDM disorders diagnosis among the 53 health care providers (HCP) of the European Reference Network for rare endocrine conditions. The response rate was 49% with a total of 26 HCPs from 13 countries. All HCPs, except 1, performed NGS investigations for SDM disorders on 6720 patients, 3764 (56%) with differences of sex development (DSD), including 811 unexplained primary ovarian insufficiency, and 2956 (44%) with congenital hypogonadotropic hypogonadism (CHH). The approaches varied from targeted analysis of custom gene panels (range: 11–490 genes) in 81.5% of cases or whole exome sequencing with the extraction of a virtual panel in the remaining cases. These analyses were performed for diagnostic purposes in 21 HCPs, supported by the National Health Systems in 16 cases. The likelihood of finding a variant ranged between 7 and 60%, mainly depending upon the number of analysed genes or criteria used for reporting, most HCPs also reporting variants of uncertain significance. These data illustrate the status of genetic diagnosis of DSD and CHH across Europe. In most countries, these analyses are performed for diagnostic purposes, yielding highly variable results, thus suggesting the need for harmonization and general improvements of NGS approaches.

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