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Table 2 HER2 immunostaining: 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 Total N° of misclassified slides(#) Reference score 0(#) Reference score 1 + (#) Reference score 2 + (#) Reference score 3 + (#)
PC1 0/4 - (*) 0/1 0/1 0/2
PC2 1/4 0/1 0/1 0/1 1/1 [2+]
PC3 1/4 0/1 1/2 [0] ^ - (*) 0/1
PC4 2/4 0/1 1/1 [0] 1/1 [1+] 0/1
PC5 2/4 0/1 - (*) 1/1 [1+] 1/2 [2+]
PC6 1/4 0/1 0/1 1/1 [1+] 0/1
PC7 2/4 0/2 - (*) - (*) 2/2 [2+;2+]
PC8 0/4 - (*) 0/2 0/1 0/1
PC9 2/4 0/1 2/2 [0;0] - (*) 0/1
PC10 1/4 0/2 - (*) 1/1 [1+] 0/1
PC11 1/4 0/1 0/1 1/1 [1+] 0/1
PC12 0/4 0/1 0/2 - (*) 0/1
PC13 0/4 0/1 - (*) 0/1 0/2
PC14 0/4 - (*) 0/2 0/1 0/1
PC15 1/4 0/1 1/2 [0] - (*) 0/1
PC16 2/4 0/1 1/1 [2+] 1/1 [1+] 0/1
Total 16/64 0/15 6/18 6/11 4/20
  1. (*) Score not received. (#)N° of misclassified slides/N° of received slides. ^ Brackets report the score provided by PCs.