There is confusion between overdiagnosis and what a false positive is. The term “false positive” is incorrectly used by the task force. It's pejorative to refer to something abnormal on a mammogram that needs additional tests as a false positive. Yes, 95% of those turn out to be negative and the patient is reassured that everything is fine. There's a big difference between that, which is not a cancer, and overdiagnosis, which is.
Overdiagnosis, as I said, is not a reason to deny screening to younger women. It's not even a reason to deny screening to older women, unless they're very sick. As long as a woman is healthy with a life expectancy of 10 years, it's reasonable to offer her screening because, if we can find a small cancer, sometimes it can be treated very easily, even with just a hormonal medication or a small operation—not do all the other stuff like radiation and chemotherapy. It's in the hands of the doctors who are treating her to use their skill to decide how much treatment to offer her.