We also detected TGFβ2 expression in 12 pairs of ESCC primary tumor tissues and matched non‐tumor tissues by Western blot, and the results revealed that TGFβ2 is overexpressed in the majority of ESCC tumors (9 cases/12 cases, 75.0%), compared with matched normal tissues (Figure S1C, Supporting Information). Here, TGFB2 is linked to esophageal squamous cell carcinoma.