If we get such news, I'll be very happy. If not and the price drops again, I will be adding again, unless it is really bad news, but I expect either something positive or neutral outcome at the worst.
To the contrary if the DMC recommended halting the trial for futility and NWBO is trying to keep it going for subgroups or change the parameters of the trial, it could be disastrous for longs. The share price could go to zero annihilating everyone who bought at any price.
(There is always the chance that something positive happens) ;)