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Table 1 Correspondence (number of cases) between the HER2 classification of individuals by IHC level and status, and FISH, obtained from the BRCA clinical data (individuals with non-concordance for HER2 classification by different testing (‘positive’ vs. ‘negative’) are highlighted in bold)

From: Ensemble outlier detection and gene selection in triple-negative breast cancer data

   HER2 (IHC)status
   ‘’ Equivocal Indeterminate Negative Positive Total
HER2 (IHC) level ‘’ 176 7 6 241 41 471
  0 (negative) 0 0 0 60 0 60
  1+ (negative) 0 4 1 255 11 271
  2+ (indeterminate) 0 166 4 1 27 198
  3+ (positive) 1 1 1 2 85 90
  Total 177 178 12 559 164 1090
HER2 (FISH) ‘’ 115 18 4 432 104 673
  equivocal 0 3 0 0 2 5
  indeterminate 0 0 0 3 1 4
  negative 53 138 6 121 12 330
  positive 9 19 2 3 45 78
  Total 177 178 12 559 164 1090