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Table 4 HER2 interpretation: misclassifications in relation to the reference score

From: External Quality Assessment (EQA) program for the preanalytical and analytical immunohistochemical determination of HER2 in breast cancer: an experience on a regional scale

ID Group Total N° of misclassified slides(#) Reference score 0(#) Reference score 1 + (#) Reference score 2 + (#) Reference score 3 + (#)
PC1 3 1/10 0/2 1/3 [2+] 0/3 0/2
PC2 3 2/10 0/2 0/3 2/3 [1+;1+] 0/2
PC3 1 1/10 0/2 1/3 (*) 0/3 0/2
PC4 1 2/10 0/2 0/3 2/3 [1+;1+] 0/2
PC5 3 0/10 0/2 0/3 0/3 0/2
PC6 2 2/10 0/2 1/3 [2+] 1/3 [3+] 0/2
PC7 3 0/10 0/2 0/3 0/3 0/2
PC8 1 2/10 1/2 [1+] ^ 0/3 1/3 [1+] 0/2
PC9 2 1/10 0/2 1/3 [2+] 0/3 0/2
PC10 2 2/10 0/2 1/3 [2+] 1/3 [1+] 0/2
PC11 2 2/10 0/2 1/3 [2+] 1/3 [1+] 0/2
PC12 1 2/10 0/2 1/3 [2+] 1/3 [1+] 0/2
PC13 3 3/10 0/2 2/3 [2+;2+] 1/3 [1+] 0/2
PC14 1 1/10 0/2 0/3 1/3 [1+] 0/2
PC15 2 2/10 0/2 1/3 [2+] 1/3 [3+] 0/2
PC16 3 4/10 0/2 2/3 [0;0] 2/3 [1+;1+] 0/2
Total 27/160 1/32 12/48 14/48 0/32  
  1. (*) Slide not evaluated. (#)N° of misclassified slides/N° of received slides. ^Brackets report the score provided by PCs.