Recent FDA approval of Ivacaftor (Kalydeco) is a promising step for a subset of patients with cystic fibrosis who have the G551D mutation. This drug enhances the cystic fibrosis transmembrane regulator (CFTR) gene in these patients; only ~4% of CF patients or about 1200 patients in the US have this genetic defect.
-NEJM 2011; 365: 1663. Effect of VX-770 -a CFTR potentiator -mild improvement in study of 167 pts. (Ivacaftor).
-NEJM 2010; 363: 1991. Effect of VX-770 -a CFTR potentiator -mild improvement in study of 39 adults.
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