Endoscopic Submucosal Dissection with/without Adjuvant Therapy for the Treatment of cT1N0M0 Esophageal Neoplasms Turned Out to be pT1b Cancers after the Endoscopic Resection : Table 2

Table 2: The results of the endoscopic submucosal dissection. Abbreviations: SM1: tumor invading the SM up to 200 μm; SM2: tumor invading the SM more than 200 μm.

	Total
	(n = 23)
Mean resected specimen length, cm	4.6 (1.5–9.5)
En block resection	23 (100%)
En block plus R0 resection	19 (82.6%)
Positive horizontal margins	0
Positive vertical margins	4 (17.4%)
The depth of tumor invasion
SM1	4 (17.4%)
SM2	19 (82.6%)
Mean depth of SM invasion, mm (range)	0.79 (0.1-1.6)
Histological grading
G1	0
G2	9 (39.1%)
G3	14 (60.9%)
Presence of lymphovascular invasion	4 (17.4%)