Table 3 Overview of IDC cases (n = 31)

From: Breast cancer Intraoperative Margin Assessment using specimen PET-CT (BIMAP)

Positive margins

Histopathology (gold standard)

9/31 (29%)

Specimen PET-CT

when all physicians (7/7) would perform a cavity shave

8/9 (89%)

 Compared with no IMA technique

NNT of 4 (26%, ARR 8/31)

 Compared with SOC

NNT of 8 (13%, ARR 4/31)

Interventions (in case of positive margins)

Direct cavity shave (SOC)

3/9 (33%)

2 seen on PET-CT

Re-operation not possible (skin)

1/9 (11%)

all seen on PET-CT

Re-operation needed

5/9 (55%)

all seen on PET-CT

  1. The absolute risk reduction (ARR) and the number needed to treat (NNT) of the specimen PET-CT as IMA technique was calculated, once in comparison with no intervention, and once in comparison with SOC. The interventions that were done in case of positive margins, were described
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