Proteostasis have identified multiple compounds that improve the folding and trafficking of F508del. These compounds have a similar level of activity to VX809, and when added to VX809, about 40% of normal function is reached. Trials are planned to start in 2015.
I've added more info and some images here: http://sixtyfiverosesblog.wordpress.com/2013/08/07/proteostasis-f508del-research/
I've added more info and some images here: http://sixtyfiverosesblog.wordpress.com/2013/08/07/proteostasis-f508del-research/