Vertex Pharmaceuticals Incorporated (Nasdaq: VRTX) announced today a correction to the previously reported responder analysis, as well as additional data from, the recent interim analysis of an ongoing Phase 2 study of VX-809 and KALYDECO™ (ivacaftor) that showed significant improvements in lung function (forced expiratory volume in one second, FEV1) 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, F508del. As previously announced, there was a statistically significant improvement in lung function (absolute change in percent predicted FEV1) across the combined treatment groups relative to baseline compared to placebos announcement provides a correction to the responder analysis.
“The improvements in lung function seen to date in this study exceeded our expectations. We're continuing to move forward as quickly as possible toward a pivotal study of VX-809 and KALYDECO in people with two copies of the F508del mutation”
On May 7, 2012, the company announced that approximately 46 percent (17/37) of patients with two copies of the F508del mutation experienced an improvement in lung function (FEV1) of 5 percentage points or more and approximately 30 percent (11/37) experienced an improvement of 10 percentage points or more from baseline to Day 56 when treated with the combination of VX-809 and KALYDECO. These results were relative improvements, not absolute improvements as originally reported.
The actual absolute improvements in lung function for these patients are: approximately 35 percent (13/37) experienced an absolute improvement of 5 percentage points or more and approximately 19 percent (7/37) experienced an absolute improvement of 10 percentage points or more from baseline to Day 56. As previously announced, none of the patients treated with placebo (0/11) achieved a 5 percentage-point or more mean absolute improvement in lung function from baseline to Day 56.