Table 1.

Relationship between PN, EGFR, and clinicopathological parameters in 83 ESCC patients

Characteristics	n	PN			EGFR
		High	Low	P-value	High	Low	P-value
Gender				0.130			0.112
Male	47	30	17		34	13
Female	36	17	19		20	16
Age (years)				0.411			0.649
<60	26	13	13		16	10
≥60	57	34	23		38	19
Tumor length (cm)				0.044			0.052
<5	68	35	33		41	27
≥5	15	12	3		13	2
Tumor location				0.334			0.285
Upper	8	3	5		4	4
Middle	44	25	19		28	16
Low	31	19	12		22	9
Invasion depth				0.007			0.022
pT1	8	1	7		2	6
pT2	26	13	13		16	10
pT3	49	33	16		36	13
Differentiation grade				0.003			0.322
Well	18	4	14		9	9
Moderate	51	33	18		36	15
Poor	14	10	4		9	5
Venous invasion				0.010			0.066
Yes	18	15	3		15	3
No	65	32	33		39	26
Lymphatic metastasis				0.000			0.000
Yes	47	35	12		39	8
No	36	12	24		15	21
Stage				0.000			0.000
I	16	3	13		4	12
II	31	14	17		21	10
III	36	30	6		30	6

Note: Bold P-values are statistically significant.

Abbreviations: PN, periostin; EGFR, epidermal growth factor receptor; ESCC, esophageal squamous cell carcinoma; pT, pathological T stage.