Table 2.

Concordance rates of pathological type, histological grade, ER, PR, HER2, and Ki67 status.

Main focus	Minor focus			Concordancerate (%)	Kappa	p-value
Pathological type	IDC	Non-IDC		78.0	0.473	<0.001
IDC	236	74
Non-IDC	11	66
Histological grade	I	II	III	88.4	0.772	<0.001
I	15	3	0
II	3	139	5
III	1	16	59
ER	Negative	Positive		94.3	0.841	<0.001
Negative	79	8
Positive	14	286
PR	Negative	Positive		90.7	0.798	<0.001
Negative	121	18
Positive	18	230
HER2	Negative	Positive		93.3	0.819	<0.001
Negative	279	11
Positive	15	82
Ki67	< 20%	≥ 20%		87.1	0.743	<0.001
< 20%	163	8
≥ 20%	42	174

ER, estrogen receptor; HER2, human epidermal growth factor receptor 2; PR, progesterone receptor.