Table 4.

Data for females assessed in Southwest London Breast Screening Service between April 2013 and March 2016 (from National Breast Screening System* assessment report)

Final non-operative diagnosis	Number of lesions sampled	% of total biopsies
B1 (no calcification)	45	2.5%
B2 (benign and concordant)	1212	66.5%
B3 (indeterminate pathology)	152	8.3%
B4 (suspicious for malignancy)	5	0.3%
B5a/c (in situ/microinvasive cancer)	360	19.7%
B5b (invasive cancer)	50	2.7%
No biopsy	332

7443 females were recalled for assessment.

4338 biopsies were performed.

1824 (42%) of biopsies were performed for microcalcification.

69 (3.8%) of biopsies were repeated for non-concordance (B1).

12 (0.65%) biopsies were repeated after B4 diagnosis.

0 cancers were identified arising from an area previously assessed for calcification.