because U.S. market is the most money when it comes to prescription drugs, imo. I have seen similar thing happened in Amarin's Vascepa drug that the management is only focusing on getting their drug approved for CVD diseases in the U.S. first before it reaches out to other countries.
A nontrusting person might say NWBO was playing word games -- ie. that NWBO intentionally made it sound like the dialogue with other substance resulted in lifting the hold rather than the company closing enrollment. I instead trust that if company really got the hold lifted simply by closing enrollment, they would have clearly stated this and not suggested closing enrollment was merely an additional piece of information collateral to whatever substance the ongoing dialogue contained that resulted in lifting the hold. Because I am trusting them, and not expecting word games. I expect there was substance in the then ongoing dialogue that we are not privy to yet.