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  • Poster presentation
  • Open Access

Incident cancer cases: what can we learn from the previous screening round?

  • 1,
  • 1 and
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Breast Cancer Research201012 (Suppl 3) :P34

  • Published:


  • Cancer Research
  • Retrospective Analysis
  • Cancer Case
  • Incident Cancer
  • Similar Amount


A retrospective analysis of all incident cancers with their previous screening round mammograms diagnosed between April 2006 and March 2008 at the North London Breast Screening unit was performed.


Two hundred and forty cancers were reviewed. In 187 cases (77.9%) the previous round mammograms were normal (group A), in 53 cases (22.1%) an abnormality was detected (group B). Of these, five (9.4%) were classified as normal/benign, 40 (75.5%) were uncertain and eight (15.1%) were suspicious. There was no significant difference in the size of the lesions between the two groups; there was, however, a significant increase in size in the lesions in group B on the subsequent mammograms (P <0.0001). Of the lesions in group B, 25 (47%) of the cases had microcalcifications only on the previous mammograms; this is higher than previously published data of 27% and 17% [1, 2] with all of these cases being subsequently diagnosed as either DCIS or IDC. Group A had less non-invasive (53, 29%) and grade 3 tumours (26, 20%) compared with group B (non-invasive = 18, 34%; grade 3 = 9, 29%) and more grade 1 tumours (51, 39% vs. 8, 26%) with a similar amount of grade 2 tumours between the groups (41% and 45%).


In 22% of incident cancer cases an abnormality is present on the previous screening round mammogram, and the most frequently overlooked lesions are microcalcifications.

Authors’ Affiliations

North London Breast Screening Unit, London, UK


  1. Maxwell AJ, et al: . Breast. 2001, 10: 392-398. 10.1054/brst.1999.0266.View ArticlePubMedGoogle Scholar
  2. O’Flynn EAM, et al: . Breast Cancer Res. 2009, 11 (Suppl 2): P8-10.1186/bcr2378.View ArticlePubMed CentralGoogle Scholar


© Scarth et al; licensee BioMed Central Ltd. 2010

This article is published under license to BioMed Central Ltd.