In addition, the ESCC biomarkers identified in previous studies (several ESCC tissues or cell lines), including ACTA2, TAGLN20, HSPA9, PDIA4, PLEC, POSTN, PSAP, and THBS121 were also covered in the Fudan cohort (Supplementary Data 3b). Here, HSPA9 is linked to esophageal squamous cell carcinoma.