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Table 1 Joint Frequency Table for HER2 Staining Status

From: A gene-protein assay for human epidermal growth factor receptor 2 (HER2): brightfield tricolor visualization of HER2 protein, the HER2 gene, and chromosome 17 centromere (CEN17) in formalin-fixed, paraffin-embedded breast cancer tissue sections

   Comparator Y
   y + y
Comparator X x + a b
  x c d