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Table 2 Primary tumor location, tumor invasion depth and areas of nodal metastasis

From: Lymph node metastatic patterns and its clinical significance for thoracic superficial esophageal squamous cell carcinoma

  Total Tumor location Tumor invasive depth
N = 228 (%) Upper (n = 34)(%) Mid (n = 125)(%) Lower (n = 69)(%) P value M3 (n = 35)(%) SM1 (n = 57)(%) SM2 (n = 61)(%) SM3 (n = 48)(%) P value
Cervical 23 (10.1) 8 (23.5) 14 (11.2) 1 (1.4) 0.002 2 (5.7) 3 (5.3) 6 (9.8) 12 (25.0) 0.002
Upper mediastinum 48 (21.1) 15 (44.1) 29 (23.2) 4 (5.8) <  0.001 1 (2.9) 12 (21.1) 16 (26.2) 19 (39.6) <  0.001
Mid-mediastinum 12 (5.3) 2 (5.9) 8 (6.4) 2 (2.9) NS 1 (2.9) 2 (3.5) 1 (1.6) 8 (16.7) 0.003
Lower mediastinum 21 (9.2) 2 (5.9) 12 (9.6) 7 (10.1) NS 2 (5.7) 5 (8.8) 4 (6.6) 10 (20.8) 0.02
Perigastric 47 (20.6) 2 (5.9) 26 (20.8) 19 (27.5) 0.038 3 (8.6) 10 (17.5) 14 (23.0) 20 (41.7) <  0.001