The Journal of the National Cancer Institute has just published a study on false-positive results from mammograms. So far Medscape is the only news organization to get the story right.
Every other news organization (so far) has taken its lead from JNCI's news release (http://www.eurekalert.org/pub_releases/2012-04/jotn-bcr033012.php
). The lead sentence of that release is "False-positive mammograms could be an indicator of underlying pathology that could result in breast cancer, according to a study published April 5 in the Journal of the National Cancer Institute."
In fact, Dan Keller, a freelancer for Medscape, realized that the study actually showed that while false-positive mammograms in the 1990s was a predictor of later breast cancer, modern imaging techniques have eliminated that problem. Since 2001 women who had false-positive results have had no greater chance of developing breast cancer than those whose mammogram results were negative.
It appears that whoever wrote the news release didn't read much past the study's abstract, and that the other news organizations who have published stories on this study (so far; as I write this it's only 100 minutes following the embargo) didn't read much past the news release.
Here are the Google News search results for "false positive" sorted by date: http://bit.ly/HjKEOE
If you follow that link, please let me know if anyone else gets the story right.