This drop was predictable given the recent quick rise. But with the possibilities here of a successful drug or a buyout, while high risk, this is clearly also high reward. Today was just a blip on where we might be in a year. I so expected this drop that I sold all of my shares (7500) at about 7.70 and bought back today at 7.01). Can't say I am surprised that it went down signficantly more, but I simply did not want to be caught with my pants down if Sunday's news is better than expected or if there is notice of a buyout by Celg or a settlement worth tens of millions. Any of these possibilities, and we are above ten.
Look at Oct 19 to Nov 14, up $2 to 7.46 and then down $3 to 4.63. This stock does this kind of move lately, but it's on the way up and news will push it up radically. For a long time this stock hardly moved. Now as the trials progress it's volatile.