Expression of Bmi-1 and PAI-1 in esophageal squamous cell carcinoma

Table 4 Correlation between plasminogen activator inhibitor-1 expression and clinicopathological data

Characteristic	Total cases	Positive cases	Positive rate (%)	χ2	P value
Differentiation degree
Moderate to high	46	39	84.8	4.351	0.061
Poor	34	22	64.7
Lymphatic metastasis
Yes	27	16	59.3	6.497	0.024
No	53	45	84.9
Sex
Male	57	44	77.2	0.097	0.777
Female	23	17	73.9
Age (yr)
< 60	34	29	85.3	2.671	0.119
≥ 60	46	32	69.6
Nationality
Han	40	30	75.0	0.069	1.000
Kazakh	40	31	77.5
Tumor size (cm)
≤ 3	33	25	75.8	0.008	1.000
> 3	47	36	76.6
Depth of infiltration
Muscular layer	26	14	53.8	10.676	0.022
Tunica externa	54	47	87.0
Pathological type
Ulcerative	37	27	73.0	0.580	0.901
Fungating	11	9	81.8
Medullary	26	20	76.9
Constrictive	6	5	76.0