MPP7 and esophageal cancer: Based on the fact that MPP7 is an important protein regulating epithelial cell polarity and that epithelial polarity is closely related to the occurrence and development of tumor [10], we studied the immunohistochemical microarrays of 103 patients with esophageal cancer to obtain survival and prognosis data, and the results suggested that MPP7 was highly expressed in tumor tissues.