Table 1 Correlation between CASC9 expression and ESCC clinical parameters

Clinical parameters	Low expression	High expression	P value^a
Clinical parameters	N = 57	N = 58	P value^a
Age (years)
<60	32	33	0.935
>60	25	25	0.935
Gender
Male	43	44	0.786
Female	14	14	0.786
Differentiation grade
Well/moderate	52	47	0.114
Poor	5	11	0.114
Primary tumor invasion depth
T1/T2	39	26	0.011*
T3/T4	18	32	0.011*
Lymph node metastasis
Negative	47	27	<0.01**
Positive	10	31	<0.01**
TNM stage
I/II	50	35	0.001**
III/IV	7	23	0.001**
Smoking
Yes	35	38	0.558
No	22	20	0.558
Drinking
Yes	34	37	0.648
No	23	21	0.648

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