It's a very difficult question to answer. We know there is a very strong anti-screening bias among the working group members.
Before the task force even began its work on this guideline, the co-chair publicly stated that she didn't believe there was any new evidence and didn't think the recommendations would change. Many of the other working group members are very strongly anti-screening, and they have already publicly published or commented on this.
I think it's about a lack of knowledge or lack of informed patient care. I am not sure if there are any other factors, but it's a good question.