Publications by authors named "Bourcigaux N"

While the prevalence of diabetes continues to rise worldwide, with 537 million adults aged 20-79-years-old having diabetes in 2021, the development of new therapeutic classes improving not only glycemic control but also kidney function and cardiovascular prevention has revolutionized patient care. Today, the treatment of diabetes is no longer just the treatment of blood sugar level. In this context, the individualized therapeutic strategy has been completely reviewed, with in particular sulfamides indicated much later in the therapeutic strategy, while SGLT2 inhibitors are indicated very early in patients with kidney disease and/or with ischemic heart disease or chronic heart failure, and GLP-1 analogues in obese patients and/or in primary or secondary cardiovascular prevention.

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Context: Liver function abnormalities (LFAs) have been described in patients with Turner syndrome (TS). Although a high risk of cirrhosis has been reported, there is a need to assess the severity of liver damage in a large cohort of adult patients with TS.

Objective: Evaluate the types of LFAs and their respective prevalence, search for their risk factors, and evaluate the severity of liver impairment by using a noninvasive fibrosis marker.

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Article Synopsis
  • - Turner syndrome (TS) is a rare genetic condition affecting about 1 in 2,500 liveborn girls, characterized by the absence of all or part of an X chromosome, with common karyotypes being 45,X and 45,X/46,XX mosaic.
  • - The French National Diagnosis and Care Protocol (PNDS) aims to guide healthcare professionals in managing TS, providing insights based on expert consensus and literature review from the French National Reference Center for Rare Growth and Developmental Endocrine disorders.
  • - TS can lead to several health issues, including growth retardation, gonadal dysgenesis, and increased risk of various congenital and acquired diseases, necessitating a collaborative approach among healthcare providers for effective patient
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Glyburide is mainly metabolized by the cytochrome P450 2C9 (CYP2C9) enzyme and enters the liver via the transporter OATP1B3. The variants OATP1B3*4 (699 G>A; rs7311358) and CYP2C9*2 and *3 are known to have a significant influence on the hepatic uptake and metabolism of glyburide, with lower clearance than in the wild type. In an ancillary study of the INDAO trial, we selected 117 pregnant women with gestational diabetes treated by glyburide and assessed the role of the combined CYP2C9 and OATP1B3 genetic polymorphisms in hypoglycemia and glycemic control.

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Objective: Turner syndrome (TS) is a rare disorder affecting 1/2500 female newborn. Aortic dilatation (AD) and aortic dissection represent a major concern in TS. The aims of our study were to describe the aortic root growth, potential aortic dilatation (AD) risk factors and cardiovascular outcomes in a cohort of patients with TS.

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Study Question: Is there an added diagnosis value of buccal cell FISH analysis compared with blood lymphocyte chromosomal investigations in patients with Turner syndrome (TS)?

Summary Answer: Buccal cell FISH analysis, a non-invasive technique, modified the chromosomal results obtained with the blood karyotype in 17 patients (12%) of our cohort.

What Is Known Already: Few studies have evaluated buccal cell FISH analysis and compared them with blood karyotype in patients with TS.

Study Design, Size, Duration: A prospective, monocentric cohort study was conducted in a rare diseases centre (CMERC) between July 2017 and August 2019.

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Adrenal infarction is usually associated with bilateral adrenal hemorrhage in the setting of antiphospholipid syndrome or hemodynamic variation. Few cases of unilateral nonhemorrhagic adrenal infarction (NHAI) have been described in the literature. Here, we report a case occurring during pregnancy.

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Study Question: What are the consequences of radioactive iodine (RAI) therapy for testicular function?

Summary Answer: A single activity of 3.7 GBq RAI for differentiated thyroid carcinoma (DTC) treatment in young men transiently altered Sertoli cell function and induced sperm chromosomal abnormalities.

What Is Known Already: Few studies, mainly retrospective, have reported the potential impacts of RAI on endocrine and exocrine testicular function.

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Importance: Randomized trials have not focused on neonatal complications of glyburide for women with gestational diabetes.

Objective: To compare oral glyburide vs subcutaneous insulin in prevention of perinatal complications in newborns of women with gestational diabetes.

Design, Settings, And Participants: The Insulin Daonil trial (INDAO), a multicenter noninferiority randomized trial conducted between May 2012 and November 2016 (end of participant follow-up) in 13 tertiary care university hospitals in France including 914 women with singleton pregnancies and gestational diabetes diagnosed between 24 and 34 weeks of gestation.

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Objectives: Only few retrospective studies have reported an efficacy rate of temozolomide (TMZ) in pituitary tumors (PT), all around 50%. However, the long-term survival of treated patients is rarely evaluated. We therefore aimed to describe the use of TMZ on PT in clinical practice and evaluate the long-term survival.

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Thyrotropin-secreting pituitary adenomas are very rare tumors, known to present overexpression of somatostatin receptor subtype 2 and which may consequently demonstrate abnormal uptake on Ga-DOTA-TOC PET/CT. A 67-year-old woman with a history of operated pituitary macroadenoma presented with symptoms of hyperthyroidism including a large goiter. Her serum thyroid hormone levels were in favor of central hyperthyroidism.

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Background: MEN1, which is secondary to the mutation of the MEN1 gene, is a rare autosomal-dominant disease that predisposes mutation carriers to endocrine tumors. Most studies demonstrated the absence of direct genotype-phenotype correlations. The existence of a higher risk of death in the Groupe d'étude des Tumeurs Endocrines-cohort associated with a mutation in the JunD interacting domain suggests heterogeneity across families in disease expressivity.

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Premature ovarian failure (POF) is clinically suspected by amenorrhea and confirmed by an elevated FSH serum level above 40 mUI/L (even 20 mUI/L) twice, in a woman before the age of 40. Prevalence of POF is between 1 to 2% in women. In 90% of cases, no aetiology is identified.

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Objective: Congenital cardiovascular malformations and aortic dilatation are frequent in patients with Turner syndrome (TS). The objective of this study was to investigate the cardiovascular findings and management in a large cohort of patients, including children and adults.

Design/methods: We recruited 336 patients with TS from a network of tertiary centers.

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Objectives: During pregnancy, the production rate of thyroid hormone increases when iodine intake is sufficient. However, the appropriateness of the free thyroxin (FT4) immunoassay is questionable. We have therefore evaluated prospectively the thyroid function in pregnancy and the relevance of the FT4 immunoassay.

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Introduction: Premature ovarian failure (POF) is defined by amenorrhea of at least 4- to 6-month duration, occurring before 40 yr of age, with two FSH levels in the postmenopausal range. Its etiology remains unknown in more than 80% of cases. Standard karyotypes, having a resolution of 5-10 Mb, have identified critical chromosomal regions, mainly located on the long arm of the X chromosome.

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The purpose of hormonal testing in infertile men is to screen treatable causes of infertility. Recommendations of the American Urological Association and the Society of Reproductive Medicine are to measure serum follicle-stimulating hormone (FSH) and testosterone if there is an abnormally low sperm concentration, impaired sexual function or clinical findings suggestive of endocrinopathy. If testosterone level is low, measurement of total and free or bioavaible testosterone should be performed as well as determination of luteinizing hormone (LH) and prolactin level.

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Background: Premature ovarian failure (POF) is defined as amenorrhoea for >6 months, occurring before the age of 40, with an FSH serum level in the menopausal range. Although Xq deletions have been known for a long time to be associated with POF, the mechanisms involved in X deletions in order to explain ovarian failure remain unknown. In order to look for potentially cryptic chromosomal imbalance, we used high-resolution genomic analysis to characterize X chromosome deletions associated with POF.

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Resistance to thyroid hormone (RTH) is an inherited syndrome characterized by elevated serum thyroid hormones (TH), failure to suppress pituitary thyroid stimulating hormone (TSH) secretion, and variable peripheral tissue responsiveness to TH. The disorder is associated with diverse mutations in the thyroid hormone beta receptor (TRbeta). Here, we report a novel natural RTH mutation (E333D) located in the large carboxy-terminal ligand binding domain of TRbeta.

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Background: Premature ovarian failure (POF) is defined as amenorrhoea for more than 6 months, occurring before the age of 40, with an FSH serum level higher than 40 mIU/ml. Cytogenetically visible rearrangements of the X chromosome are associated with POF. Our hypothesis was that cryptic Xq chromosomal rearrangements could be an important etiological contributor of POF.

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Background And Objective: Mutations in bone morphogenic protein 15 (BMP15) and growth/differentiation factor 9 (GDF9) lead to altered fertility in animal models. In the human, a heterozygous point mutation of BMP15 has been associated with premature ovarian failure (POF).

Subject And Methods: We have directly sequenced both genes in a cohort of 203 POF patients presenting with primary or secondary amenorrhea and high FSH levels and in a control population including 54 women with regular menstrual cycles who had at least one child.

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Background: Non-islet cell tumor hypoglycemia(NICTH) is a rare cause of recurrent hypoglycemia. It has been associated with the tumoral overproduction of high-molecular-weight insulin-like growth factor (IGF)-2 ("big IGF-2"). Big IGF-2 suppresses growth hormone (GH) biosynthesis and impairs the storage of IGFs by suppressing the formation of the GH-dependent ternary complexes containing IGF, IGF binding protein 3 (IGFBP-3), and acid-labile subunit (ALS).

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Background: In vitro oocyte maturation (IVM) permits the use of immature oocytes in IVF. IVM does not require ovarian stimulation and so can be offered to patients at risk of ovarian hyperstimulation syndrome.

Methods: For this indication, we carried out 45 cycles of IVM in 33 women with polycystic ovarian syndrome (PCOS).

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Adrenocortical carcinoma remains a challenge for the therapeutist; prognosis is ominous. Various abnormalities playing a pathogenetic role have been recently described in adrenocortical tumors. Among them, dysregulation of the IGF system and imprinting mistakes at the 11p15 locus play a determining role in malignant transformation of adrenocortical cells.

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