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      The Challenge of Defining and Investigating the Causes of Idiopathic Short Stature and Finding an Effective Therapy

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          Abstract

          Idiopathic short stature (ISS) comprises a wide range of conditions associated with short stature that elude the conventional diagnostic work-up and are often caused by still largely unknown genetic variants. In the last decade, the improvement of diagnostic techniques has led to the discovery of causal mutations in genes involved in the function of the growth hormone (GH)/insulin-like growth factor-I (IGF-I) axis as well as in growth plate physiology. However, many cases of ISS remain idiopathic. In the future, the more frequent identification of the underlying causes will allow a better stratification of subjects and offer a tailored management. GH therapy has been proposed and approved in some countries for the treatment of children with ISS. To improve the efficacy of GH therapy, trials with GH combined with GnRH agonists, aromatase inhibitors, and even IGF-I have been conducted. This review aims to revise the current definition of ISS and discuss the management of children with ISS on the basis of the most recent evidence.

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          Many sequence variants affecting diversity of adult human height.

          Daniel Gudbjartsson, G Walters, Gudmar Thorleifsson … (2008)
          Adult human height is one of the classical complex human traits. We searched for sequence variants that affect height by scanning the genomes of 25,174 Icelanders, 2,876 Dutch, 1,770 European Americans and 1,148 African Americans. We then combined these results with previously published results from the Diabetes Genetics Initiative on 3,024 Scandinavians and tested a selected subset of SNPs in 5,517 Danes. We identified 27 regions of the genome with one or more sequence variants showing significant association with height. The estimated effects per allele of these variants ranged between 0.3 and 0.6 cm and, taken together, they explain around 3.7% of the population variation in height. The genes neighboring the identified loci cluster in biological processes related to skeletal development and mitosis. Association to three previously reported loci are replicated in our analyses, and the strongest association was with SNPs in the ZBTB38 gene.
          Article 0 comments Cited 229 times – based on 0 reviews     Review now
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            Consensus statement on the diagnosis and treatment of children with idiopathic short stature: a summary of the Growth Hormone Research Society, the Lawson Wilkins Pediatric Endocrine Society, and the European Society for Paediatric Endocrinology Workshop.

            P. Cohen, A Rogol, C L Deal … (2008)
            Our objective was to summarize important advances in the management of children with idiopathic short stature (ISS). Participants were 32 invited leaders in the field. Evidence was obtained by extensive literature review and from clinical experience. Participants reviewed discussion summaries, voted, and reached a majority decision on each document section. ISS is defined auxologically by a height below -2 sd score (SDS) without findings of disease as evident by a complete evaluation by a pediatric endocrinologist including stimulated GH levels. Magnetic resonance imaging is not necessary in patients with ISS. ISS may be a risk factor for psychosocial problems, but true psychopathology is rare. In the United States and seven other countries, the regulatory authorities approved GH treatment (at doses up to 53 microg/kg.d) for children shorter than -2.25 SDS, whereas in other countries, lower cutoffs are proposed. Aromatase inhibition increases predicted adult height in males with ISS, but adult-height data are not available. Psychological counseling is worthwhile to consider instead of or as an adjunct to hormone treatment. The predicted height may be inaccurate and is not an absolute criterion for GH treatment decisions. The shorter the child, the more consideration should be given to GH. Successful first-year response to GH treatment includes an increase in height SDS of more than 0.3-0.5. The mean increase in adult height in children with ISS attributable to GH therapy (average duration of 4-7 yr) is 3.5-7.5 cm. Responses are highly variable. IGF-I levels may be helpful in assessing compliance and GH sensitivity; levels that are consistently elevated (>2.5 SDS) should prompt consideration of GH dose reduction. GH therapy for children with ISS has a similar safety profile to other GH indications.
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              Guidelines for Growth Hormone and Insulin-Like Growth Factor-I Treatment in Children and Adolescents: Growth Hormone Deficiency, Idiopathic Short Stature, and Primary Insulin-Like Growth Factor-I Deficiency

              Adda Grimberg, Sara A. DiVall, Constantin Polychronakos … (2017)
              Background/Aims: On behalf of the Drug and Therapeutics, and Ethics Committees of the Pediatric Endocrine Society, we sought to update the guidelines published in 2003 on the use of growth hormone (GH). Because idiopathic short stature (ISS) remains a controversial indication, and diagnostic challenges often blur the distinction between ISS, GH deficiency (GHD), and primary IGF-I deficiency (PIGFD), we focused on these three diagnoses, thereby adding recombinant IGF-I therapy to the GH guidelines for the first time. Methods: This guideline was developed following the GRADE approach (Grading of Recommendations, Assessment, Development, and Evaluation). Results: This guideline provides recommendations for the clinical management of children and adolescents with growth failure from GHD, ISS, or PIGFD using the best available evidence. Conclusion: The taskforce suggests that the recommendations be applied in clinical practice with consideration of the evolving literature and the risks and benefits to each individual patient. In many instances, careful review highlights areas that need further research.
              Article 0 comments Cited 192 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (publisher-id): HRP
                Journal ID (nlm-ta): Horm Res Paediatr
                Journal ID (doi): 10.1159/issn.1663-2818
                Title: Hormone Research in Paediatrics
                Publisher: S. Karger AG
                ISSN (Print): 1663-2818
                ISSN (Electronic): 1663-2826
                Publication date Subscription-year: 2019
                Publication date (Print): January 2020
                Publication date (Electronic): 02 October 2019
                Volume: 92
                Issue: 2
                Pages: 71-83
                Affiliations
                [_a] aDipartimento Pediatrico Universitario Ospedaliero Bambino Gesù Children’s Hospital – Tor Vergata University, Rome, Italy
                [_b] bBaystate Children’s Hosptal, University of Massachusetts Medical School-Baystate, Springfield, Massachusetts, USA
                [_c] cDepartment of Women’s and Children’s Health, Karolinska Institutet and University Hospital, Stockholm, Sweden
                Author notes
                *Prof. Stefano Cianfarani, Dipartimento Pediatrico Universitario Ospedaliero Bambino Gesù Children’s Hospital – Tor Vergata University, Piazza S. Onofrio 4, IT–00165 Rome (Italy), E-Mail stefano.cianfarani@uniroma2.it
                Article
                Publisher ID: 502901 Other ID: Horm Res Paediatr 2019;92:71–83
                DOI: 10.1159/000502901
                PubMed ID: 31578025
                SO-VID: a37cb05f-573c-4cbc-9413-dc3adc84a403
                Copyright © © 2019 S. Karger AG, Basel
                License:

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                Date received : 30 January 2019
                Date accepted : 26 August 2019
                Page count
                Figures: 1, Tables: 2, Pages: 13
                Categories
                Subject: Mini Review Article

                ScienceOpen disciplines: Endocrinology & Diabetes,Neurology,Nutrition & Dietetics,Sexual medicine,Internal medicine,Pharmacology & Pharmaceutical medicine
                Keywords: Idiopathic short stature,Insulin-like growth factor-1,Short normal children,Growth hormone
                Data availability:
                ScienceOpen disciplines: Endocrinology & Diabetes, Neurology, Nutrition & Dietetics, Sexual medicine, Internal medicine, Pharmacology & Pharmaceutical medicine
                Keywords: Idiopathic short stature, Insulin-like growth factor-1, Short normal children, Growth hormone

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