- Design
- Systematic review and meta-analysis of observational studies
- Population
- 844 B3 breast lesions diagnosed on vacuum-assisted biopsy, five studies
- Primary outcome
- Upgrade to malignancy on subsequent excision
- Effect
- Pooled 11.23% (95% CI 7.22–17.04%); prediction interval 4.56–25.06%
A systematic review pooled five full-text studies that followed B3 (uncertain malignant potential) breast lesions diagnosed on vacuum-assisted biopsy. Of 844 lesions, 98 were upgraded to malignancy on excision: a pooled 11.2% (95% CI 7.2–17.0%), with a prediction interval of 4.6–25.1%.
Studies of second-line vacuum-assisted excision reported upgrade rates from 5% to 21%, but these were not pooled because case mix and pathways differed. Certainty was rated very low, and several reports could not be retrieved in full.
For pathologists the message is about the report: a B3 category covers lesions with very different upgrade risks, and multidisciplinary teams need the specific lesion type — atypical ductal hyperplasia, papilloma with or without atypia, radial scar — and whether atypia is present to decide between excision, vacuum excision and surveillance.
- Name the specific B3 lesion and state whether atypia is present.
- Bring B3 results to the multidisciplinary meeting with imaging correlation.
- Expect an upgrade rate of roughly one in nine overall, varying widely by lesion type.
- Note the sampling method, since vacuum biopsy and vacuum excision carry different meaning.
Why it matters
Surveillance versus excision for B3 lesions turns on detail the pathology report must carry.
Don't overread it
Certainty was very low and only five studies were pooled.
The statistics, in plain English
The prediction interval of 4.6% to 25.1% is the range expected in a new centre, and is wider than the confidence interval because the studies disagreed (I² 61%).
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