KALYDECO® (ivacaftor) is a cystic fibrosis transmembrane conductance regulator (CFTR) potentiator indicated for the treatment of cystic fibrosis (CF) in patients age 6 years and older who have one of the following mutations in the CFTR gene: G551D, G1244E, G1349D, G178R, G551S, S1251N, S1255P, S549N, or S549R. If the patient's genotype is unknown, an FDA-cleared CF mutation test should be used to detect the presence of a CFTR mutation followed by verification with bi-directional sequencing when recommended by the mutation test instructions for use.
Limitations of Use
KALYDECO is not effective in patients with CF who are homozygous for the F508del mutation in the CFTR gene.
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References: 1. KALYDECO (ivacaftor) [prescribing information]. Boston, MA: Vertex Pharmaceuticals Incorporated; February 2014. 2. Ramsey BW, Davies J, McElvaney NG, et al; VX08-770-102 Study Group. A CFTR potentiator in patients with cystic fibrosis and the G551D mutation. N Engl J Med. 2011;365(18):1663-1672. 3. Davies JC, Wainwright CE, Canny GJ, et al; VX08-770-103 (ENVISION) Study Group. Efficacy and safety of ivacaftor in patients aged 6 to 11 years with cystic fibrosis with a G551D mutation. Am J Respir Crit Care Med. 2013;187(11):1219-1225. 4. Zielenski J. Genotype and phenotype in cystic fibrosis. Respiration. 2000;67(2):117-133. 5. Welsh MJ, Ramsey BW, Accurso F, Cutting GR. Cystic fibrosis: membrane transport disorders. In: Valle D, Beaudet A, Vogelstein B, et al, eds. The Online Metabolic & Molecular Bases of Inherited Disease. The McGraw-Hill Companies, Inc; 2004:part 21, chap 201. http://www.ommbid.com. Accessed April 16, 2014. 6. Welsh MJ, Smith AE. Molecular mechanisms of CFTR chloride channel dysfunction in cystic fibrosis. Cell. 1993;73(7):1251-1254. 7. Orenstein DM, Spahr JE, Weiner DJ. Cystic Fribrosis: A Guide for Patient and Family. 4th ed. Philadelphia, PA: Lippincott Williams & Wilkins; 2012. 8. Yu H, Burton B, Huang C-J, et al. Ivacaftor potentiation of multiple CFTR channels with gating mutations. J Cyst Fibros. 2012;11(3):237-245.
9. US CF Foundation, Johns Hopkins University. The Hospital for Sick Children. The Clinical and Functional TRanslation of CFTR (CFTR2). http://www.cftr2.org/index.php. Accessed April 16, 2014. 10. Berwouts S, Morris MA, Girodon E, Schwarz M, Stuhrmann M, Dequeker E. Mutation nomenclature in practice: findings and recommendations from the cystic fibrosis external quality assessment scheme. Hum Mutat. 2011;32(11):1197-1203. 11. US Department of Agriculture, Agricultural Research Service, Nutrient Data Laboratory Web site. http://www.ndb.nal.usda.gov/. Accessed April 16, 2014.
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