CASC9 and esophageal squamous cell carcinoma: In ESCC, CASC9, ECM, and OIP5‐AS1 are demonstrated to enhance ESCC cell metastasis and could be biomarkers for ESCC prognosis and treatment.4, 5, 6 Furthermore, Chang et al. 7 verified that TUSC7 restrained cell proliferation and chemotherapy resistance and colony formation in ESCC.