ONXX said that AMGN's initial $120 offer "significantly undervalued the company." Releasing the data to AMGN and others will significantly raise the $130 bid. ONXX knows this. Otherwise, they would never have okay'd the data release if there was anything negative about it. It would not only cause ONXX to retreat to pre-offer prices, but with a release of negative data (assuming it was negative, and ONXX knew it), ONXX knows the offers would be recinded, and the price of ONXX would drop like a rock. Conclusion: the data is very good, and ONXX will hold out for a better offer (than $130). We are headed to $150+... IMHO only.
I will be happy if offer is much higher than $150. But realistically, I think ONXX and AMGN are very close to sealing the deal and this was the last item that will do it. I think ONXX and AMGN deal happens very soon. AZN is still doing due diligence but I doubt ONXX will wait for a bid to come from them given the leak that both ONXX and AMGN are OK with $130.