This is the most succinct, clear discussion of the studies released last week about teh benefits of mammography for women in their 40s that I have read.
There is some benefit to screening all women in their 40s....pretty much all studies show this. This question is how much benefit is there and how much does it cost. There is also harm in screening everyone (radiation, false positives). From a broad health policy perspective, the biggest issue is that our nation needs to learn how to talk about issues such as this in a reasonable, non-hysterical way.