It is true that you can enter a search for vx 661 on the vertex website and turn up some old press releases stating that the drug will enter phase 2 clinical trials by the end of 2011. However its not listed on their drug candidates tab under medications and no study exists on the clinical trials government website for vx 661 trials. I have seen articles that say they will begin the trials in the first quarter of 2012 and other articles say middle of 2012. I just don't know whats causing the delay. The phase 2b vx809/770 trials seem to be temporarily held up for the moment as well; stuck in the recruiting phase for the last couple months. This could be because they just modified the trial to include people with only one copy of DF508 so maybe thats holding things up. I just wish I knew someone involved with the trials who could maybe give us a heads up. I seriously might just call them tomorrow and ask why vx661 and 809 are slowing down while 770 is just flying out of the gate.