Table 3.

Comparison of receptor status between core needle biopsy and surgery

Receptor status	Surgery									P-valuea)
Core needle biopsy		ER			PR			HER2
	+		-	+		-	+		-
All patients										0.14
+	27		0	20		8	17		4
-	4		24	3		24	3		31
P-valueb)		0.13			0.23			>0.99
Concordance rate (%)		93			80			87
Non-NAC groupc)										0.23
+	14		0	11		3	5		1
-	0		8	0		8	2		14
P-valueb)		>0.99			0.25			>0.99
Concordance rate (%)		100			86			86
NAC groupd)										0.30
+	13		0	9		5	12		3
-	4		16	3		16	1		17
P-valueb)		0.13			0.73			0.63
Concordance rate (%)		88			76			88

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

^a)P-values indicate a comparison among the three receptors.

^b)P-values indicate a comparison of the receptor status between core needle biopsy and surgery.

^c)Non-NAC group was the group of patients who went through surgery without prior NAC.

^d)NAC group was the group of patients who went through NAC prior to surgery.