Journals / İzmir Dr. Behçet Uz Çocuk Hastanesi Dergisi / 2016 / Cilt: 6 - Sayı: 3

Five cases with Laron syndrome: Clinical and molecular evaluation

Laron sendromlu 5 olgu: Klinik ve moleküler değerlendirme

Pages
219–222
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

As a result, it has been demonstrated that cases with Laron syndrome patients do not give adequate clinical response to recombinant IGF treatment.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Laron Syndrome is defined as primary growth hormone resistance or insensitivity.
📊
Key Findings & Data:Our aim is to discuss the clinical,laboratory findings and growth hormone receptor gene mutation analysis of the Laron Syndrome cases.5 patients'(two girls, 3 boys) pretreatment height standard deviation score (SDS), annual growth rates, growth hormone, and IGF-1, IGFBP3 levels , age at initial treatment age, and also the height SDS, and annual growth rates, at first, second, and third years of the treatment, the doses of the targeted drugs which can be used were evaluated to find the effectiveness of the treatment.Growth hormone receptor gene mutations were evaluated.
💡
Conclusion & Impact:As a result, it has been demonstrated that cases with Laron syndrome patients do not give adequate clinical response to recombinant IGF treatment.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Laron Syndrome is defined as primary growth hormone resistance or insensitivity. Our aim is to discuss the clinical,laboratory findings and growth hormone receptor gene mutation analysis of the Laron Syndrome cases.5 patients'(two girls, 3 boys) pretreatment height standard deviation score (SDS), annual growth rates, growth hormone, and IGF-1, IGFBP3 levels , age at initial treatment age, and also the height SDS, and annual growth rates, at first, second, and third years of the treatment, the doses of the targeted drugs which can be used were evaluated to find the effectiveness of the treatment.Growth hormone receptor gene mutations were evaluated. The mean age was 3.0±2.7 years, height SDS was -5.06±0.7 and target height SDS was -0.72±0.95. Pretreatment annual growth rate was 3.5±1.7 cm (1.8-6.0). Baseline growth hormone levels were over 40 pg/ml in all patients. Mean baseline IGF, mean IGF response to IGF generation test values were 9.7±9.9 ng/ml, and 10.7±9.8 ng/ml, respectively. Due to the difficulties to get the recombinant IGF treatmen, we could start the therapy at the mean age of 4.06±2.6 years. Usually the doses of the drugs used per year were under the targeted doses for the patients. The average annual growth rates were 3.73 cm/year, 4,24 cm/year, 3,55 cm/year, at 1st, second and third years, respectivelly. Growth hormone receptor gene analysis revealed homozygote missense c.1630 A>C(p.I544L) mutation in one patient and; c.1419 C>T(p.S473S) polymorphism in two siblings and c.1681 C>A(p.P561T) homozygous mutation in one patient, c.629 T>G(p.V210G) ve c.1567 A>C(p.I526L) compound heterozygous mutation in one patient. As a result, it has been demonstrated that cases with Laron syndrome patients do not give adequate clinical response to recombinant IGF treatment.

Özet

Laron sendromu, primer büyüme hormon direnci veya duyarsızlığı olarak tanımlanan bir hastalıktır. Bu çalışmada kliniğimizde izlenen Laron sendromu tanılı olguların klinik, laboratuvar ve "Büyüme Hormon Reseptor" gen mutasyonlarının değerlendirilmesi amaçlandı. Beş (2 kız, 3 erkek) olgunun, tedavi öncesi boy SDS, yıllık büyüme hızları, büyüme hormonu, IGF-1, IGF-BP3 düzeyleri, tedavi başlama yaşı, tedavini etkinliğini belirlemek amacıyla tedavinin birinci, ikinci ve üçüncü yıllarında boy SDS ve yıllık büyüme hızı ölçümleri, hedeflenen ve kullanılabilen ilaç dozları (mg/kg/yıl) değerlendirildi. "Büyüme Hormon Reseptor" gen mutasyonları çalışıldı. Tanıda ortalama yaş 3,0±2,7 yıl, boy SDS -5,06±0,7, hedef boy SDS -0,72±0,95, tedavi öncesi yıllık büyüme hızı 3,5±1,7 cm idi. Laboratuvar incelemelerinde bazal büyüme hormonu tüm hastalarda 40 pg/ml üzerinde, bazal IGF-1 düzeyleri 9,7±9,9 ng/ml, IGF jenerasyon testine ortalama IGF yanıtı 10,7±9,8 ng/ml saptandı. İlaç temininde oluşan aksaklıklar nedeni ile rekombinant IGF-1 tedavisine başlama yaşı 4,06±2,6 idi. Yıllık uygulanan ilaç miktarlarının genel olarak hedeflenen düzeyin altında kaldığı saptandı. Olguların ortalama yıllık büyüme hızı tedavinin 1. yılında; 3,73 cm/yıl, 2. yılında 4,24 cm/yıl, 3. yılında 3,55 cm/yıl olarak bulundu. Olguların birinde "Büyüme Hormon Reseptor" geninde homozigot missense c.1630 A>C (p.I544L) mutasyon ve iki kardeşte c.1419 C>T (p.S473S) polimorfizmi, 1 olguda c.1681 C>A (p.P561T) homozigot mutasyonu, 1 olguda c.629 T>G (p.V210G) ve c.1567 A>C (p.I526L) bileşik heterozigot mutasyonu saptandı. Sonuç olarak, Laron sendrom'lu bu olgularda rekombinant IGF-1 tedavisine yeterli klinik yanıt olmadığı gösterildi.

🔖

Cite This Article

KORKMAZ, Ö., TOSYALI, M., BERDELİ, A., GÖKŞEN, D., DARCAN, Ş. (2016). Five cases with Laron syndrome: Clinical and molecular evaluation. İzmir Dr. Behçet Uz Çocuk Hastanesi Dergisi, Cilt: 6 - Sayı: 3, 219–222. https://ajindex.com/articles/201689

📄 Full Text PDF Viewer

📄

PDF görüntüleyici hazırlanıyor...

References (9)

  1. Laron Z, Pertzelan A, Mannheimer S. Genetic pituitary dwar- fism with high serum concentation of growth hormone-a new inborn error of metabolism? Isr J Med Sci 1966;2:152-155.
  2. Sobrier ML, Dastot F, Duquesnoy P, et al. Nine novel growth hormone receptor gene mutations in patients with Laron syndrome. J Clin Endocrinol Metab 1997;82:435-437. https://doi.org/10.1210/jc.82.2.435 Laron Z. Laron syndrome (primary growth hormone resistan- ce or insensitivity): The personal experience 1958-2003. J Clin Endocrinol Metab 2004;89:1031-1044. https://doi.org/10.1210/jc.2003-031033
  3. Chernausek SD, Backeljauw PF, Frane J, et al. Long-term treatment with recombinant insulin-like growth factor (IGF)-I in children with severe IGF-I deficiency due to growth hormo- ne insensitivity. J Clin Endocrinol Metab 2007;92:902-910. https://doi.org/10.1210/jc.2006-1610 Rosenbloom AL. Mecasermin (Recombinant Human Insulin- like Growth Factor I). Adv Ther 2009;26(1):40-54. https://doi.org/10.1007/s12325-008-0136-5
  4. Ranke MB, Savage MO, Chatelain PG, et al. Long-term tre- atment of growth hormone insensitivity syndrome with IGF-I. Results of the European Multicentre Study. The Working Group on Growth Hormone Insensitivity Syndromes. Horm Res 1999;51:128-134.
  5. Chernausek SD, Backeljauw PF, Frane J, et al. Long-term treatment with recombinant insulin-like growth factor (IGF)-I in children with severe IGF-I deficiency due to growth hormo- ne insensitivity. J Clin Endocrinol Metab 2007;92:902-910. https://doi.org/10.1210/jc.2006-1610
  6. Laron Z, Anin S, Klipper-Aurbach Y, Klinger B. Effects of insulin-like growth factor on linear growth, head circumfe- rence, and body fat in patients with Laron-type dwarfism. Lancet 1992;339(8804):1258-1261. https://doi.org/10.1016/0140-6736(92)91594-X
  7. Camacho-Hubner C, Underwood LE, Yordam N, et al. Once daily rhIGF-1/rhIGFBP-3 treatment improves growth in children with severe primary IGF-1 deficiency: results of a multicenter clinical trial [abstract]. Endocrine Society's Annual Meeting; June 27; Boston, MA. 2006.
  8. Guevara-Aguirre J, Rosenbloom AL, Vasconez O, et al. Two- year treatment of growth hormone (GH) receptor deficiency with recombinant insulin-like growth factor I in 22 children: comparison of two dosage levels and to GH-treated GH defi- ciency. J Clin Endocrinol Metab 1997;82(2):629-633. https://doi.org/10.1210/jc.82.2.629
  9. Backeljauw PF, Underwood L & the GHIS Collaborative Group.Therapy for 6.5-7.5 years with recombinant insulin- like growth factor I i