NCT05858606

Multidisciplinary Evaluation and a Genome-wide Analysis in a Cohort of Idiopathic Short Stature Patients

Pilot Study of Ethiology Research by a Multidisciplinary Evaluation Then a Genome-wide Analysis in a Cohort of Idiopathic Short Stature Patients

• Status: Not Yet Recruiting
• Phase: N/A
• Study type: Interventional
• Enrollment: 200 (estimated)
• Sponsor: University Hospital, Montpellier · Academic / Other
• Sex: All
• Age: 4 Years – 18 Years
• Healthy volunteers: Not accepted

Summary

Our trial aims to evaluate the prevalence of idiopathic short stature among children whose growth is above -2,5SD (AFPA- CRESS/Inserm -CompuGroup Medical 2018 curve) or above -2SD of the parental target size (taking child gender into account), after exclusion of classical pediatric and endocrinologic pathologies, and to evaluate the prevalence of monogenic causes of idiopathic short stature. We propose to perform a two-step study. The first one consists in a standardized multidisciplinary clinico-radiological evaluation of those children to evaluate the real prevalence of idiopathic short stature (ISS) among these patients. The second step consists in performing a whole genome sequencing analysis in the 30 first patients for whom the diagnosis of ISS is confirmed.

Detailed description

Detailed description: Establishing the etiological diagnosis of short stature is an important step to guide the therapeutic management of patients and to propose appropriate genetic counseling. Short stature can be a symptom of many pathologies. However, in the majority of cases (80%), no specific etiology is found during a pediatric clinical investigation. In this case, the diagnosis of "idiopathic" short stature is performed. However, the diagnostic and therapeutic management of short stature after exclusion of classical pediatric causes is extremely heterogeneous and there are currently no consensual recommendations. We could therefore expect to have a much higher proportion of diagnosed patients with more standardized procedures both clinical and genetic. Additionally, in recent years, new methods of genetic investigation (gene panel, whole exome or whole genome sequencing analysis) have made it possible to identify many genetic variants associated with apparently isolated short stature. So far, none of the publications reporting next-generation sequencing analysis have focused on patients with authentic idiopathic short stature, i.e. without associated bone anomalies or syndromic features, and are often focused on only a subset of target genes. Our trial aims at estimating the prevalence of idiopathic short stature among children whose growth is above -2,5SD (AFPA- CRESS/Inserm -CompuGroup Medical 2018 curve) or above -2SD of the parental target size, after exclusion of classical pediatric and endocrinologic pathologies, and to evaluate the prevalence of monogenic causes of idiopathic short stature. We propose to perform a two-step study. The first one consists in a multidisciplinary clinico-radiological evaluation of those children to evaluate the real prevalence of idiopathic short stature (ISS) among these patients. The second step consists in performing a whole genome sequencing analysis in the 30 first patients for whom the diagnosis of authentic ISS is confirmed. All patients will have: * a pre-inclusion visit * an inclusion visit after which the multidisciplinary clinico-radiological evaluation will be held This analysis will assign patients to the diagnosis of either: 1. non-idiopathic short stature (diagnosis of constitutional bone disease or syndromic disorder) 2. authentic idiopathic short stature A teleconsultation (1) to explain to the parents the conclusions of the multidisciplinary clinico-radiological evaluation. This teleconsultation will be followed for all patients in the "non-idiopathic short stature" group, by a visit to take samples for genetic analysis in the context of clinical care, followed by a teleconsultation (2) to give them and explain the results This teleconsultation will be followed for the first 30 patients in the "authentified idiopathic short stature" group, by a visit to take samples for whole genome analysis in the context of research, followed by a teleconsultation (2) to return the results.

Conditions

• Idiopathic Short Stature

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Evaluation of the prevalence of truly (authentified) idiopathic short stature after multidisciplinary clinico-radiological evaluation	1. pre-inclusion consultation 2. inclusion consultation * personal history * height, weight, cranial perimeters, and spans of both parents * clinical examination of the child * photographs of the child * additional X-rays
PROCEDURE	analysis in a multidisciplinary consultation meeting via a secure platform (ShareConfrère) for evaluation by multidisciplinary team	multidisciplinary team (geneticist, orthopedist, radiologist, pediatric endocrinologist) which will assign each patient an orientation: * either to the non idiopathic short stature group (syndromic diagnostic orientation or to a constitutional bone pathology) * or to the authentified idiopathic short stature group
GENETIC	Whole genome analysis for authentified idiopathic short stature	For the first 30 patients included in the authentified idiopathic short stature group, a whole genome analysis in trio (child + parents) will be performed as part of the research. For these 30 patients in the authentified idiopathic short stature group, the teleconsultation carried out for the submission of the multidisciplinary consultation meeting conclusions will make it possible to establish the family tree, to explain the interest and limits of the analysis, and to submit the consents dedicated to the genetic analysis.

Timeline

• Start date: 2023-06-01
• Primary completion: 2026-06-01
• Completion: 2027-06-01
• First posted: 2023-05-15
• Last updated: 2023-05-15