Introduction
The definition of an interval cancer is a cancer diagnosed between scheduled screening rounds. Interval cancer rates are an indication of the effectiveness of a Breast Screening Service in achieving early cancer detection, thus reducing overall mortality secondary to breast cancer, and represent a National Health Service Breast Screening Programme (NHSBSP) standard. The British Society of Breast Radiology (BSBR) Interval Classifications are as follows: 0 = unclassifiable, 1 = normal/benign, 2 = uncertain and 3 = suspicious. An audit was undertaken of interval cancers assigned a classification of 2 or 3 within our Breast Service over a 3-year period with the aim of determining and implementing improved clinical practice in a learning environment.