The earnings call is a meanless meeting to find out how much dilution has been taking place. A list of positive events are shared to take attention off of the financials. It also helps us determine if the dilution was worth it.
People are paying a lot of money to see the earth shattering results and data at the conference...releasing it prior would be screwing the people wanting to see the unveiling first hand...not to mention it would piss off the conference committee.
Would you want a movie trailer to give away the ending before going to the theater?...especially if you have been waiting years to see the movie finally realeased?
If that's all that were going to be said, that would probably not have an adverse impact on the share price.
So, I guess the question now becomes what happens if there isn't a PR like that? Can we infer mixed data results? We already know the hit pieces will claim the trial failed no matter what they report (see: NWBO) but I still don't think we will see any similar press releases from the company until CTAD. We'll see...