Use of Two View Mammography Compared with One View in the Detection of Small Invasive Cancers: Further Results from the National Health Service Breast Screening Programme

Abstract

For prevalent (first) screens, programmes changing from one view mammography in 1994/95 to two views in 1995/96 reported a 45% (95% confidence interval (CI) 25% to 68%) increase in the detection of invasive cancers of < 15 mm. In comparison, programmes that were already using two views in 1994/95 showed no change in 1995/96. For incident (subsequent) screens the small number of programmes that have opted to use two views reported 25% (95% CI 1% to 55%) more invasive cancers of < 15mm than programmes using one view in 1995/96, and 42% (95% CI 11% to 81%) more in 1994/95. CONCLUSIONS--These results confirm the benefit of using two view mammography in the detection of small invasive cancers, and provide evidence that this effect is seen in subsequent screens as well as the first screen.