check this out on the vertex release re df508:
DISCOVER Data
Vertex also announced today the results of the Phase 2 DISCOVER study, which was primarily designed to provide additional safety data for VX-770 and is part of the registration program. DISCOVER enrolled 140 people who had two copies of the F508del mutation, which prevents the CFTR protein from moving to its proper location at the cell surface. The majority of people with CF have at least one copy of the F508del mutation.
The primary endpoints of DISCOVER were safety and absolute change from baseline in lung function through 16 weeks. Adverse events were similar between the treatment groups. Adverse events that occurred more frequently (?5 percent) in the VX-770 treatment group compared to placebo were cough, nausea, rash and contact dermatitis. None of these events were serious or led to discontinuation of VX-770. Data from the DISCOVER study will be submitted for presentation at an upcoming medical meeting.
Mean baseline lung function (FEV1) was 79.7 percent predicted for people who received VX-770 compared to 74.8 percent predicted for patients in the placebo group. Results of the DISCOVER study showed that people treated with VX-770 achieved a mean absolute improvement from baseline compared to placebo of 1.6 percent through 16 weeks (p=0.25). The improvement was not statistically significant and was not considered clinically meaningful.
Data from the study also showed a mean relative improvement in lung function from baseline compared to placebo of 2 percent through week 16. A mean reduction in sweat chloride of 2.9 mmol/L compared to placebo through 16 weeks was observed among those treated with VX-770. This improvement was statistically significant but small (p<0.04).
"Based on the results of DISCOVER, we continue to believe the combination of a potentiator and corrector may be the best approach to treating people with two copies of the F508del mutation," said Robert Kauffman, M.D., Ph.D., Senior Vice President and Chief Medical Officer for Vertex. "Data are anticipated later this year from the first study to evaluate the combination of VX-770 and VX-809 in this group of people with cystic fibrosis."
Shows a small but clinically significant reduction if sodium chloride in the df508 people, which could indicate that the 770 acually works on the level they're hoping (combined with 809).
