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Sometimes when a study comes out that I'm very interested in blogging about, I don't get around to it right away. In the blogging biz, this sort of delay is often considered a bad thing, because blogging tends to be very immediate, about being the firstest with the mostest, and the moment to strike and be heard about major studies is brief. Of course, there's also real life as well. That this particular study came out in the New England Journal of Medicine (NEJM) didn't help. So, here it is, a week and a half later, and I'm finally getting around to it.

The last couple of weeks, I've made allusions to the "Bat Signal" (or, as I called it, the "Cancer Signal," although that's a horrible name and I need to think of a better one). Basically, when Bat Cancer Signal goes up (hey, I like that one better, but do bats get cancer?), it means that a study or story has hit the press that demands my attention.

A reduction in breast cancer deaths has been primarily attributed to mammography screening.

Mammography is a topic that, as a breast surgeon, I can't get away from. It's a useful tool that those of us who treat breast cancer patients have used for over 30 years to detect breast cancer in asymptomatic women and thus (or so we hope) decrease their risk of dying of breast cancer through early intervention. We have always known, however, that mammography is an imperfect tool. Oddly enough, its imperfections come from two different directions.

The Canadian National Breast Screening Study trials, which are an anomaly among major mammography trials, have had a significant impact on guidelines for women aged 40 to 49.