Table 1. FAP protein expression pattern according to the different pathological parameters in the center and the infiltrating front of the analyzed primary tumors.

		Tumor center				Tumor front
		Negative staining (%)	Positive staining (%)	Chi-square (p value)	Negative staining (%)	Positive staining (%)	Chi-square (p value)
Grade	1-2	42.3	57.7	0.104	36.1	63.9	0.018
	3	27.3	72.7		15.2	84.8
pT	pT1 - pT2	69.2	30.8	0.003*	30.8	69.2	0.64
	pT3	44	56		35.1	64.9
	pT4	25	75		28.6	71.4
N	N0	47.2	52.8	0.295	41.7	58.3	0.43
	N1	42.6	57.4		29.9	70.1
	N2	33.7	66.3		33.3	66.7
M	M0	41.4	58.6	0.644	35.1	64.9	0.432
	M1	38.3	61.7		30.1	69.9
Stage	I-II	54.2	45.8	0.330	45.8	54.2	0.343
	III	35.8	61.5		32.7	67.3
	IV	38.3	61.7		30.1	69.9

Statistical significance was determined by Chi-square test. Statistically significant values are highlighted in bold.