MKI67 and esophageal squamous cell carcinoma: The results of immunohistochemical staining and TUNEL immunofluorescence staining demonstrated the molecular impact of ZSH‐2208 on ESCC‐TRCs growth in vivo, indicating that 0.28 mg/kg of ZSH‐2208 significantly reduced Ki67 expression and increased the proportion of fluorescence‐positive cells in the TUNEL assay (Figures 3C,D and S4C,D).