Did you read this part too:

> But after several unsuccessful attempts to reproduce the research, the paper became the subject of an internal review by Genentech’s Research Review Committee (RRC), according to four high-level Genentech employees at the time; two were senior scientists and two were scientists who also served as executives. Three spoke on the condition of anonymity because of the sensitivity of the allegations and non-disclosure agreements. The scientists, one of whom was an executive who sat on the review committee and all of whom were informed of the review’s findings at the time due to their stature at the company, said that the inquiry discovered falsification of data in the research, and that Tessier-Lavigne kept the finding from becoming public.