Table 2. Clinicopathological features of 38 superficial ESCC cases.

Features		Non-metastasis	Metastasis
Gender	Female	7	7
	Male	12	12
Age	>=57	10	13
	<57	9	6
Family history	Yes	4	4
	No	15	15
Smoking	Yes	14	9
	No	5	10
Drinking	Yes	12	5
	No	7	14
Differentiation	Well	6	5
	Moderately	12	12
	Poorly	1	2
Location	Upper thoracic	1	3
	Middle thoracic	7	7
	Lower thoracic	11	9
Depth	mucosa	1	0
	Submucosa	18	19
Lymphovascular invasion	Yes	1	2
	No	18	17