IL13 and esophageal squamous cell carcinoma: Systemic IL-13 concentration was significantly higher in ESCC patients with lymph node involvement (11.6 pg/mL (9.8–13.7) in N ≥ 1 vs. 6.57 pg/mL (3.9–11.1) in N0, p = 0.014) and tended to be higher in ESCC patients with distant metastases (11.8 pg/mL (9.4-15) in M1 vs. 8.03 pg/mL (5.7–11.2) in M0, p = 0.089).