Table 2. Relationship between HER2 expressions in matched-pair samples.

Pre CRT [n]	Post CRT [n]
	POS [12]	IND [8]	NEG [10]	pCR or NET [19]
POS [6]	2	0	0	4
IND [12]	3	2	2	5
NEG [31]	7	6	8	10

POS, positive, HER2 IHC 3+; IND, indeterminate, HER2 IHC 2+; NEG, negative, HER2 IHC 0, 1+ by IHC. HER2, human epidermal growth factor receptor 2; CRT, chemoradiotherapy; pCR, pathologic complete response; NET, not enough tumor to examine.