A population-based study found false-positive results in approximately 20 percent of women who completed 10 biennial breast cancer screenings.
About 1 in 20 patients had an invasive procedure due to a false-positive result. These findings were published in Cancer.
For this study, researchers retrospectively evaluated data from 421,545 women who participated in BreastScreen Norway, a population-based screening program that includes biennial mammography.
By December 20, 2019, there were 18,203 patients who had undergone 10 screenings over 20 years. The mean age at the tenth screening was 68.5 years (range, 66-71 years).
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