Table 3.

Histological outcomes after endoscopic submucosal dissection of 56 esophageal early squamous cell carcinomas.

Surface of the histological specimen, cm2 – mean ± SD	13.5 ± 10
Maximal diameter of lesion, mm – mean ± SD	41 ± 19
Depth of tumour infiltration – n (%)
High grade dysplasia or in situ carcinoma (m1)	21 (37.5%)
m2	13 (23%)
m3	4 (7%)
Superficial submucosa (<200 µm)	12 (21%)
Deep submucosa (>200 µm) or T2	6 (11%)
Grade of tumour differentiation – n (%)
Well-differentiated	45 (80%)
Moderately differentiated	6 (11%)
Poorly differentiated	5 (9%)
Lymphatic or vascular involvement – n (%)	8 (14%)
R0 resection rate – n (%)	48 (86%)
Positive lateral margins	5 (9%)
Positive vertical margins	4 (7%)
Positive vertical and lateral margins	1 (2%)
Curative resection rate	40 (71%)

R0 resection: histologically complete resection; SD: standard deviation.