Safety and Efficacy of Elexacaftor/Tezacaftor/Ivacaftor for 24 Weeks or Longer in People with Cystic Fibrosis and One or More <i>F508del</i> Alleles: Interim Results of an Open-Label Phase 3 Clinical Trial
Matthias Griese, Stefano Costa, Rachel W. Linnemann, Marcus Mall, Edward F. McKone, Deepika Polineni, Bradley S. Quon, Felix C. Ringshausen, Jennifer L. Taylor‐Cousar, Nicholas Withers, Samuel M. Moskowitz, Cori Daines
Abstract
Safety results from this interim analysis were consistent with the initial 24-week placebo-controlled F/MF pivotal study, with similar or lower exposure-adjusted event rates observed in the OLE (Table 1) (5). ELX/TEZ/IVA was generally safe and well tolerated. Most AEs were consistent with common manifestations of CF and were not treatment limiting (3, 10). In participants who received ELX/TEZ/IVA in parent studies, improvements in efficacy and PD measures, including ppFEV1, SwCl concentration, BMI, CFQ-R RD score, and PEx event rate, were maintained or continued to improve further over 24 weeks (F/MF genotypes) or 36 weeks (F/F genotype) of additional treatment. These results validate the durability of ELX/TEZ/IVA efficacy responses, with no emerging safety concerns. Among participants who had received placebo or TEZ/IVA in the respective parent studies, initiation of ELX/TEZ/IVA rapidly led to marked improvements in these efficacy measures that were consistent with the results seen in the ELX/TEZ/IVA arms of those parent studies. Thus, the results of this combined-group interim analysis demonstrate the safety and sustained efficacy of long-term ELX/TEZ/IVA treatment in pwCF 12 years old or older with one or more F508del alleles.