RESUMEN
Rationale: The advent of precision treatment for cystic fibrosis using small-molecule therapeutics has created a need to estimate potential clinical improvements attributable to increases in cystic fibrosis transmembrane conductance regulator (CFTR) function. Objectives: To derive CFTR function of a variety of CFTR genotypes and correlate with key clinical features (sweat chloride concentration, pancreatic exocrine status, and lung function) to develop benchmarks for assessing response to CFTR modulators. Methods: CFTR function assigned to 226 unique CFTR genotypes was correlated with the clinical data of 54,671 individuals enrolled in the Clinical and Functional Translation of CFTR (CFTR2) project. Cross-sectional FEV1% predicted measurements were plotted by age at which measurement was obtained. Shifts in sweat chloride concentration and lung function reported in CFTR modulator trials were compared with function-phenotype correlations to assess potential efficacy of therapies. Measurements and Main Results: CFTR genotype function exhibited a logarithmic relationship with each clinical feature. Modest increases in CFTR function related to differing genotypes were associated with clinically relevant improvements in cross-sectional FEV1% predicted over a range of ages (6-82 yr). Therapeutic responses to modulators corresponded closely to predictions from the CFTR2-derived relationship between CFTR genotype function and phenotype. Conclusions: Increasing CFTR function in individuals with severe disease will have a proportionally greater effect on outcomes than similar increases in CFTR function in individuals with mild disease and should reverse a substantial fraction of the disease process. This study provides reference standards for clinical outcomes that may be achieved by increasing CFTR function.
Asunto(s)
Regulador de Conductancia de Transmembrana de Fibrosis Quística/genética , Fibrosis Quística/genética , Adolescente , Adulto , Niño , Fibrosis Quística/fisiopatología , Regulador de Conductancia de Transmembrana de Fibrosis Quística/fisiología , Femenino , Volumen Espiratorio Forzado , Estudios de Asociación Genética , Humanos , Masculino , Persona de Mediana Edad , Medicina de Precisión/métodos , Adulto JovenRESUMEN
The Cystic Fibrosis Foundation is a voluntary, nonprofit, health organization whose mission is "to assure the development of the means to cure and control cystic fibrosis and to improve the quality of life for those with the disease." While substantial progress has been made, as evidenced by a marked increase in the median predicted age of survival, much work remains to be done. Ongoing medical programs and activities of the Cystic Fibrosis Foundation, which span basic science, drug discovery, drug development, clinical care, patient education, and advocacy, will be described in this article. The key role of respiratory therapists in the cystic fibrosis community will be highlighted.
