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Volume 6 Supplement 1

Symposium Mammographicum 2004

  • Poster presentation
  • Open Access

The incidence of interval breast cancers from Wirral Breast Screening Unit between 1 January 1994 and 30 June 2000

  • 1,
  • 1,
  • 1 and
  • 1
Breast Cancer Research20046 (Suppl 1) :P62

  • Published:


  • Breast Cancer
  • Cancer Research
  • Survival Time
  • Detection Rate
  • Negative Rate


To report the detection rate of interval breast cancers in the Wirral Breast Screening Unit between 1 January 1994 and 30 June 2000.


Women aged 50–64 years were invited for screening, and data prospectively collected for both screen-detected and interval cancer detection rates. Case notes for interval cancers were reviewed together with two-view mammography. True interval and false negative rates were determined for the interval cancers. Rates of recurrence and survival times for these cancers were also collected.


Between 1 January 1994 and 30 June 2000, 82,510 women were invited to attend for screening at the Wirral Breast Screening Unit. A total 63,159 (77%) women attended and 293 screen-detected cancers were observed. A total of 215 invasive interval cancers were detected for the same period, 28% of these occurred in the first 12 month interval, 37% in the next 13–24 months and 36% in the last 25–36 month interval.


The rate of interval cancers was similar over the 3-year period between screening rounds and the incidence of these cancers may not be reduced by shortening the mammographic screening period.

Authors’ Affiliations

Wirral Hospitals NHS Trust, Merseyside, UK


© BioMed Central 2004