Efectividad de ivacaftor en vida real en niños con fibrosis quística y mutación G551D / Real-world effectiveness of ivacaftor in children with cystic fibrosis and the G551D mutation

Introducción: Ivacaftor es un potenciador de la proteína reguladora de la conductancia transmembrana de la fibrosis quística (CFTR) que ha demostrado en ensayos clínicos mejoría del estado nutricional y la función pulmonar de pacientes con fibrosis quística con mutación G551D. El objetivo de este estudio es describir la evolución en la vida real de niños tratados con ivacaftor. Métodos: Se describe la evolución en vida real de 4 niños con fibrosis quística con genotipo F508del/G551D comparando los datos durante el tratamiento con ivacaftor respecto a la situación basal y al año previo al tratamiento. Resultados: Se analizan 4 niños de entre 6 y 14 años, incluyendo uno con diagnóstico reciente de fibrosis quística y otro con infección persistente por Mycobacterium abscessus (M. abscessus) y aspergilosis broncopulmonar alérgica (ABPA) recurrente. El volumen espiratorio forzado en el primer segundo (FEV1) basal fue del 58,5-81,8% del predicho y recibieron ivacaftor 24 meses de media (rango 12-30 meses). Todos los pacientes tuvieron una mejoría significativa y mantenida de la función pulmonar. Respecto a la situación basal, el z-score del peso mejoró 1,53 puntos y el z-score del índice de masa corporal (IMC) 1,6 puntos. Comparado con el año previo al tratamiento con ivacaftor, disminuyeron la frecuencia de aislamientos de Pseudomonas aeruginosa (P. aeruginosa) (-0,4/paciente/año) y el número de exacerbaciones respiratorias (-1,8/paciente/año). La dosis de lipasa ajustada por kilo disminuyó progresivamente en todos los pacientes. Un paciente resolvió durante el tratamiento la infección por M. abscessus y la ABPA. Conclusiones: Los niños con fibrosis quística y mutación F508del/G551D tratados con ivacaftor mostraron en la vida real mejoría de la función pulmonar, el estado nutricional, las exacerbaciones respiratorias, los aislamientos de P. aeruginosa y la dosis de enzimas pancreáticas

Introduction: Ivacaftor is a cystic fibrosis transmembrane conductance regulator (CFTR) potentiator that has been shown to improve the nutritional status and lung function of cystic fibrosis patients with the G551D mutation in clinical trials. The objective of this study was to describe the real-world progress of children receiving ivacaftor. Methods: We describe the real-world progress of four children with cystic fibrosis and the F508del/G551D genotype comparing data during ivacaftor treatment with baseline and with the year before commencing treatment. Results: Our sample comprised 4 children aged between 6 and 14 years and including one with a recent diagnosis of CF and other with persistent Mycobacterium abscessus (M. abscessus) and recurrent allergic bronchopulmonary aspergillosis. The baseline FEV1 was 58.5% to 81.8% of the predicted value, and ivacaftor was taken for a mean 24 months (range, 12-30 months). All patients experienced a significant and sustained improvement in lung function. Compared to baseline, the weight z-score improved by 1.53 points, and the BMI z-score by 1.6 points. Compared to the year before starting ivacaftor, the frequency of Pseudomonas aeruginosa (P. aeruginosa) isolates decreased (-0.4/patient/year), as did the number of respiratory exacerbations (-1.8/patient/year). The weight-adjusted dose of lipase per kilogram decreased progressively in all patients. In 1 patient, a previously persistent M. abscessus infection and recurrent allergic bronchopulmonary aspergillosis resolved during treatment. Conclusions: Children with cystic fibrosis and the F508del/G551D genotype receiving treatment with ivacaftor experienced a real-world improvement in lung function, nutritional status, respiratory exacerbations, isolation of P. aeruginosa, and dose of pancreatic enzymes

[Real-world effectiveness of ivacaftor in children with cystic fibrosis and the G551D mutation]. / Efectividad de ivacaftor en vida real en niños con fibrosis quística y mutación G551D.

INTRODUCTION: Ivacaftor is a cystic fibrosis transmembrane conductance regulator (CFTR) potentiator that has been shown to improve the nutritional status and lung function of cystic fibrosis patients with the G551D mutation in clinical trials. The objective of this study was to describe the real-world progress of children receiving ivacaftor. METHODS: We describe the real-world progress of four children with cystic fibrosis and the F508del/G551D genotype comparing data during ivacaftor treatment with baseline and with the year before commencing treatment. RESULTS: Our sample comprised 4 children aged between 6 and 14 years and including one with a recent diagnosis of CF and other with persistent Mycobacterium abscessus (M. abscessus) and recurrent allergic bronchopulmonary aspergillosis. The baseline FEV1 was 58.5% to 81.8% of the predicted value, and ivacaftor was taken for a mean 24 months (range, 12-30 months). All patients experienced a significant and sustained improvement in lung function. Compared to baseline, the weight z-score improved by 1.53 points, and the BMI z-score by 1.6 points. Compared to the year before starting ivacaftor, the frequency of Pseudomonas aeruginosa (P. aeruginosa) isolates decreased (-0.4/patient/year), as did the number of respiratory exacerbations (-1.8/patient/year). The weight-adjusted dose of lipase per kilogram decreased progressively in all patients. In 1 patient, a previously persistent M. abscessus infection and recurrent allergic bronchopulmonary aspergillosis resolved during treatment. CONCLUSIONS: Children with cystic fibrosis and the F508del/G551D genotype receiving treatment with ivacaftor experienced a real-world improvement in lung function, nutritional status, respiratory exacerbations, isolation of P. aeruginosa, and dose of pancreatic enzymes.