Cancer stem cells (CSCs) represent a subpopulation of tumor cells that exhibit capacities for tumor initiation and progression. Identifying CSCs and their related pathways is necessary for the development of new therapeutic targets against tumors. However, the molecular mechanism of CSCs in esophageal squamous cell carcinoma (ESCC) remains elusive. This study demonstrated that OV6 expression was closely associated with ESCC patients' clinical outcome and prognosis. OV6