Here they have different priorities including whether there are resources relative to other cancers that are also competing for trials etc. At least 5 ppl effectively have veto power here
~30 people (specialists in the disease from around the country, statisticians, administrators etc) have effective veto. All it takes is 1-2 strong voices & your whole idea can be shredded
After all this you hope that the trial is embraced by the community and accrues. But I have seen trials close down despite all this work due to poor accrual