SR | Adding ultrasound to mammography increases breast cancer detection, but increases false-positives and biopsies

Summary: The systematic review examined the effectiveness and safety of combining mammography with breast ultrasonography versus mammography alone for breast cancer screening in women at average risk. The research included one randomized controlled trial, two prospective cohort studies, and five retrospective cohort studies, involving a total of 209,207 women.

High certainty evidence from one trial indicated that combining mammography with ultrasonography led to the detection of more breast cancer cases than mammography alone (5 vs. 3 per 1000 women). However, this combination also led to a higher number of false-positive results and biopsies. For every 1000 women screened with the combined approach, 37 more received a false-positive result, and 27 more women underwent a biopsy.

Secondary analysis of the trial data revealed that in women with dense breasts, the combined screening detected more cancer cases than mammography alone, while cohort studies for women with non-dense breasts showed no statistically significant difference between the two screening methods.

The included studies did not analyze whether the higher number of detected cancers with the combined screening method resulted in lower mortality rates compared to mammography alone. Further research, including randomized controlled trials or prospective cohort studies with longer observation periods, is needed to assess the impact of the two screening interventions on morbidity and mortality.

Article: Mammography in combination with breast ultrasonography versus mammography for breast cancer screening in women at average risk – Cochrane Database of Systematic Reviews

Summary: Mammography followed by ultrasonography compared to mammography alone for breast cancer screening in women at average risk of breast cancer – Cochrane Database of Systematic Reviews