The study in question was a post-marketing requirement from the FDA’s approval of Xeljanz in 2012. Whether Xeljanz’s label will be updated as a result of the study is unclear at this point.
Xeljanz has annualized worldwide sales of ~$2.5B.
p.s. “Shares” is evidently the new “updates” for biotech PRs bearing bad news.
“The efficient-market hypothesis may be the foremost piece of B.S. ever promulgated in any area of human knowledge!”