{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T17:52:54Z","timestamp":1791309174015,"version":"4.3.1"},"reference-count":10,"publisher":"Bioscientifica","issue":"10","license":[{"start":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T00:00:00Z","timestamp":1790208000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["journals.bioscientifica.com"],"crossmark-restriction":true},"short-container-title":[],"published-print":{"date-parts":[[2026,10,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>Natural history registries can address knowledge gaps and support the development of best practice guidelines to improve outcomes in rare conditions. The European Registries for Rare Endocrine and Bone conditions (EuRREB) Core Registry is a standardised, multi-national platform designed to collect harmonised clinical data across rare endocrine disorders and facilitate longitudinal real-world analyses. The aim of this study was to describe data collected in the Core Registry across eight endocrine main thematic groups (MTGs) during the first six years following its launch in 2019, with a particular focus on the transition period, defined as 14\u201325 years of age. Forty-eight centres from 20 European and non-European countries contributed data, of which 33 (69%) were members of the European Reference Network on rare endocrine conditions (Endo-ERN). A total of 3,225 unique patients were registered, with a median age of 37 years. Overall, the hypothalamic and pituitary MTG accounted for the largest number of records (n = 1,548). The highest proportion of patients in the transition age group was observed in the sex development and maturation MTG (66%, 445\/677), followed by thyroid (33%, 86\/260) and growth and genetic obesity (32%, 42\/130). A total of 303 patients had an active platform account, and 85 completed patient-reported outcome measures. Clinicians completed a total of 2,390 condition-specific outcomes. These findings demonstrate the capacity of the Core Registry to generate real-world insights across rare endocrine conditions and age groups. The observed transition-age representation highlights an opportunity to strengthen structured pathways and support continuity of care across the paediatric\u2013adult interface.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Plain language summary<\/jats:title>\n                    <jats:p>The European Registries for Rare Endocrine and Bone conditions (EuRREB), supported by the Endo-ERN, collects information on rare diseases to improve care. This study shares what we learned over six years, including how young people move from paediatric to adult care.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1530\/ec-26-0333","type":"journal-article","created":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T14:31:41Z","timestamp":1790260301000},"update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-10","source":"Crossref","is-referenced-by-count":0,"title":["The EuRREB Core Endocrine Registry and its potential for studying transition of care in Endo-ERN centres"],"prefix":"10.1530","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4209-9996","authenticated-orcid":true,"given":"Ana Luisa","family":"Priego Zurita","sequence":"first","affiliation":[{"name":"Department of Medicine, Division of Endocrinology, Leiden University Medical Center 1 , ,","place":["Leiden, The Netherlands, Endo-ERN (European Reference Network on Rare Endocrine Conditions) centre"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1731-2994","authenticated-orcid":true,"given":"Mariya","family":"Cherenko","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Endocrinology, Leiden University Medical Center 1 , ,","place":["Leiden, The Netherlands, Endo-ERN (European Reference Network on Rare Endocrine Conditions) centre"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacqueline","family":"van der Blom-de Gunst","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Endocrinology, Leiden University Medical Center 1 , ,","place":["Leiden, The Netherlands, Endo-ERN (European Reference Network on Rare Endocrine Conditions) centre"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jillian","family":"Bryce","sequence":"additional","affiliation":[{"name":"Office for Rare Conditions, Royal Hospital for Children & Queen Elizabeth University Hospital 2 , ,","place":["Glasgow, UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christopher","family":"Smythe","sequence":"additional","affiliation":[{"name":"Office for Rare Conditions, Royal Hospital for Children & Queen Elizabeth University Hospital 2 , ,","place":["Glasgow, UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0689-5549","authenticated-orcid":true,"given":"S Faisal","family":"Ahmed","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Endocrinology, Leiden University Medical Center 1 , ,","place":["Leiden, The Netherlands, Endo-ERN (European Reference Network on Rare Endocrine Conditions) centre"]},{"name":"Office for Rare Conditions, Royal Hospital for Children & Queen Elizabeth University Hospital 2 , ,","place":["Glasgow, UK"]},{"name":"Developmental Endocrinology Research Group, School of Medicine, Dentistry & Nursing, University of Glasgow 3 , ,","place":["Glasgow, UK"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natasha M","family":"Appelman-Dijkstra","sequence":"additional","affiliation":[{"name":"Department of Medicine, Division of Endocrinology, Leiden University Medical Center 1 , ,","place":["Leiden, The Netherlands, Endo-ERN (European Reference Network on Rare Endocrine Conditions) centre"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"416","published-online":{"date-parts":[[2026,9,24]]},"reference":[{"key":"2026100613064291500_bib1","doi-asserted-by":"crossref","DOI":"10.1530\/EC-22-0025","article-title":"We mind your step: understanding and preventing drop-out in the transfer from paediatric to adult tertiary endocrine healthcare","volume":"11","author":"Davidse","year":"2022","journal-title":"Endocr Connect"},{"key":"2026100613064291500_bib2","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1530\/EC-20-0520","article-title":"Transition of young adults with endocrine 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