Danish researchers as saying that, for unknown reasons, women whose mammogram screenings generate “false positives” are at a higher risk of being diagnosed with breast cancer in the years that follow. The University of Copenhagen study, published in Cancer Epidemiology, attempted to determine how much, if any, of the extra risk is due to doctors missing the cancer the first time they scrutinized the seemingly dire mammogram findings, but such errors explained just a small percentage of the increased risk, said lead author and epidemiologist My von Euler-Chelpin. The researcher said it’s likely a smaller percentage of American women would have a heightened risk for breast cancer after a false-positive test because the US has a higher rate of false positives than Denmark.