Table 5.

The expression of vimentin protein in different components of PESC

	Number	Expression rate of vimentin protein (%)	Positive in epithelial component (%)	Positive in spindle component (%)	Positive in both of epithelial and spindle components (%)	χ 2	P
Age
< 60 years	26	26 (100.0)	2 (7.7)	26 (100.0)	2 (7.7)	0.15	1.000
≥ 60 years	56	56 (100.0)	5 (8.9)	56 (100.0)	5 (8.9)
Gender
Male	57	57 (100.0)	5 (8.8)	57 (100.0)	5 (8.8)	0.15	1.000
Female	25	25 (100.0)	2 (8.0)	25 (100.0)	2 (8.0)
Family history
Positive	18	18 (100.0)	3 (16.7)	18 (100.0)	3 (16.7)	3.347	0.309
Negative	64	64 (100.0)	4 (6.3)	64 (100.0)	4 (6.3)
Smoking
Yes	41	41 (100.0)	4 (9.8)	41 (100.0)	4 (9.8)	0.379	1.000
No	41	41 (100.0)	3 (7.3)	41 (100.0)	3 (7.3)
Alcohol
Yes	36	36 (100.0)	5 (13.9)	36 (100.0)	5 (13.9)	3.782	0.282
No	46	46 (100.0)	2 (4.3)	46 (100.0)	2 (4.3)
Tumor location
Upper	3	3 (100.0)	0 (0.0)	3 (100.0)	0 (0.0)	1.57	0.832
Middle	54	54 (100.0)	4 (7.4)	54 (100.0)	4 (7.4)
Lower	25	25 (100.0)	3 (12.0)	25 (100.0)	3 (12.0)
Gross appearance
Polypoid	69	69 (100.0)	5 (7.2)	69 (100.0)	5 (7.2)	7.59	0.188
Ulcerative	8	8 (100.0)	0 (0.0)	8 (100.0)	0 (0.0)
Infiltrating	5	5 (100.0)	2 (40.0)	5 (100.0)	2 (40.0)
Lymph node metastasis
Yes	23	23 (100.0)	2 (8.7)	23 (100.0)	2 (8.7)	0.21	1.000
No	59	59 (100.0)	5 (8.5)	59 (100.0)	5 (8.5)
TNM stage
I	29	29 (100.0)	0 (0.0)	29 (100.0)	0 (0.0)	7.50	0.067
II	37	37 (100.0)	5 (13.5)	37 (100.0)	5 (13.5)
III	16	16 (100.0)	2 (12.5)	16 (100.0)	2 (12.5)
IV	0	0 (0.0)	0 (0.0)	0 (0.0)	0 (0.0)