Excerpt from: Vertex (click for full article)
Vertex Pharmaceuticals Incorporated (Nasdaq: VRTX) today announced data from a Phase 2 study of VX-661 and ivacaftor that showed statistically significant improvements in lung function among adults with cystic fibrosis (CF) who have two copies (homozygous) of the most common mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene, known as F508del. The study evaluated four dose levels of VX-661 (10, 30, 100 and 150 mg) dosed once daily for 28 days in combination with ivacaftor (150 mg) dosed twice daily. The study also evaluated a separate group of patients who received VX-661 (10, 30, 100 and 150 mg) dosed without ivacaftor for 28 days. Dose-dependent, mean relative improvements in lung function (percent predicted forced expiratory volume in one second; FEV1), both within group and versus placebo, were observed across the combination dosing groups. Patients in the 100 and 150 mg combination dose groups showed statistically significant mean relative improvements in lung function, versus placebo, of 9.0 percent (p=0.01) and 7.5 percent (p=0.02), respectively, at Day 28. In contrast, patients who received placebo showed a 0.03 percent mean relative change in lung function at Day 28 (within-group). The mean relative FEV1 across the combination dose groups returned toward baseline during the post-treatment 28-day washout period. VX-661 was generally well-tolerated, both as monotherapy and in combination with ivacaftor, and most adverse events were mild to moderate in severity and similar between the treatment groups and those who received placebo. Vertex plans to conduct additional studies of VX-661 to further evaluate its potential for late-stage development, pending regulatory discussions.