Those are a couple of great questions.
The abnormal recalls—what they've called false positives—are vastly exaggerated, and our patients tell us they are so grateful when they get screened and are happy to return to screening. The majority of studies show this.
Overdiagnosis—the case of diagnosing a cancer that is not going to lead to death in a woman because she might die of another cause—is a small, acknowledged risk of screening. It is much less likely in a woman in her forties who has another 40 to 50 years ahead of her than a woman in, say, her eighties who might die of other causes. Saying this is a harm to prevent a woman from benefiting from early diagnosis is an exaggeration.