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Table 1 The characteristics of the patients with pT1 ESCC

From: A nomogram to predict lymph node metastasis risk for early esophageal squamous cell carcinoma

Variables Derivation, n = 223 (%) Validation, n = 80 (%)
Sex, male/female 189/34 69/11
Age: median (range) 59 (42–77) 62 (42–75)
Location
 Upper 13 (5.8) 7 (8.8)
 Middle 112 (50.2) 49 (61.3)
 Lower 98 (44.0) 24 (30)
Tumor number
 Single 200 (89.7) 71 (88.8)
 Mutifocal 23 (10.3) 9 (11.3)
 Tumor size, cm: median (range) 2.0 cm (0.3–7.0 cm) 2.0 cm (0.6–8.0 cm)
 Harvested lymph nodes: median (range) 19 (0–85) 19 (3–76)
Surgery
 Sweet 5 (2.2) 0
 Ivor-Lewis 52 (23.3) 3 (3.75)
 Mckeown 21 (9.4) 2 (2.5)
 Minimally invasively esophagectomy 145 (65.0) 75 (93.7)
cT stage
 cT1a 65 (29.1) 37 (46.3)
 cT1b 20 (9.0) 21 (26.3)
 cT2 6 (2.7) 6 (7.5)
 cT3 7 (3.1) 3 (3.8)
 Unknown 125 (56.1) 13 (16.3)
Differentiation
 High-middle 188 (84.3) 65 (81.3)
 Low 35 (15.7) 15 (18.8)
Depth of invasion
 Mucosal epithelial 34 (15.2) 8 (10)
 Lamina propria mucosa 4 (1.3) 3 (3.8)
 Muscularis mucosae 44 (19.7) 20 (25)
 Submucosal 141 (63.7) 49 (61.3)
Lymphovascular invasion
 Not reported 207 (92.8) 77 (96.3)
 Reported 16 (7.2) 3 (3.75)
Lymph node metastasis
 N0 187 (83.9) 67 (83.9)
 N1 30 (13.5) 9 (13.5)
 N2 6 (2.7) 3 (2.7)
 N3 0 (0) 1 (1.25)