Wednesday, February 17, 2010

When Evidence Collides With Anecdote, Politics and Emotion: Breast Cancer Screening


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That's the title of an editorial in this week's Annals of Internal Medicine (subscription required - even though the article is marked as "free" on the Annals home page.)

It's a reflection on the US Preventive Service Task Force's recommendations on breast cancer screening from last fall. The Annals editors remind readers:

"Although some subspecialty organizations advocate more aggressive routine breast cancer screening, the update actually aligned the USPSTF recommendations more closely with guidelines from the American College of Physicians, the World Health Organization, and the United Kingdom's National Health Service."

Other excerpts:

"Annals posted a survey on our Web site to solicit readers' impressions. The responses suggest that clinicians are more inclined to change what they do in light of the new recommendations than are members of the general public. ...


Clinicians who offer advice compatible with the new USPSTF recommendations are likely to meet resistance. Most women who responded to the survey resolved to continue as routine the practices that the USPSTF advises against being routine. ...

The Task Force's charge is to provide evidence-based, population-level guidance. Only rarely does evidence unequivocally support a single, definite "one-size-fits-all" recommendation. As the breast cancer recommendations so vividly illustrate, clinicians must often invoke the art of medicine to apply available evidence to an individual patient. Before these most recent guidelines, many clinical encounters about breast cancer screening probably involved little more than the physician handing the patient a mammography referral. Going forward, these interactions will surely involve more discussion about risks, harms, benefits, and preference. The Task Force's intent was to motivate such rational discussion, not to ration care. ...

Because the USPSTF issued recommendations that were politically unpopular among some constituents, there have been calls to curtail this independent body's work. If the USPSTF sinks in turbulent waters whipped up by emotion, anecdotes, and politics, Americans should mourn its loss."

Finally, the Annals editors referred to "a media cacophony" - a phrase I've used in reference to coverage of this episode. They wrote that "the media and politicians presented the breast cancer screening recommendations as a major departure from existing guidelines that heralded an age of rationed care in the United States. Confusion, politics, conflicted experts, anecdote, and emotion ruled front pages, airwaves, the Internet, and dinner-table conversations."

This episode was - and still can be - a golden opportunity for informing people about evidence - and for shared decision-making. This won't be last collision between evidence and anedote/politics/emotion. Will we be any smarter next time?

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