. 2019 Aug;8(4):1233–1241. doi: 10.21037/tcr.2019.06.51

Table 1. The difference of EP₂ and EGFR in different clinical features’ patients of 63 (pN+) ESCC.

Clinical characteristics	Case	EP₂				EGFR
Clinical characteristics	Case	+	−	χ²	P	+	−	χ²	P
Age (years)
≤60	29	25	4	4.746	0.029	27	2	2.396	0.122
>60	34	21	13			27	7
Gender
Male	52	36	16	2.166	0.141	44	8	0.294	0.588
Female	11	10	1			10	1
Stage
II	19	13	6	0.292	0.589	15	4	1.017	0.313
III	44	33	11			39	5
Length of tumor (cm)
<3	9	6	3	0.215	0.643	9	0	1.750	0.186
≥3	54	40	14			45	9
Location of tumor
Middle	37	29	8	1.309	0.253	33	4	0.884	0.347
Low	26	17	9			21	5
Differentiation
High or middle	53	36	17	4.393	0.036	45	8	0.178	0.673
Poor	10	10	0			9	1
Smoking
No	35	26	9	0.064	0.800	27	8	4.725	0.030
Yes	28	20	8			27	1
Drinking
No	36	26	10	0.027	0.870	30	6	0.389	0.533
Yes	27	20	10			24	3

EP_2, prostaglandin E receptor 2; EGFR, epidermal growth factor receptor; ESCC, esophageal squamous cell carcinoma.

Table 1. The difference of EP2 and EGFR in different clinical features’ patients of 63 (pN+) ESCC.