I think the thing to keep in mind here is that women are much more likely to be victims of malpractice, and that women are also much more likely to blame themselves for the harm that comes to them than the people who do the harm. So it's distinctly possible that not only is there a large number of women who are being treated for no reason, but there is probably also a large number of women who don't think it's worth it to call this malpractice out.
The cynic in me, who sees the predatory nature of this country's healthcare/pharmaceutical industry, would not be surprised at all to find out that women with this kind of "maybe it's cancer" are being targeted for unnecessary treatment because it's easy to victimize them.