Objective To investigate the role of PI3 KCA and PI3 KCB protein in the occurrence and development of esophageal squamous cell carcinoma. Methods Totally 126 cases of esophageal squamous cell carcinoma tissues,32 cases of high-grade intraepithelial neoplasia( HGIN) tissues,34 cases of low-grade intraepithelial neoplasia( LGIN) tissues,and 30 cases of normal esophageal mucosa were collected. The positive expression rate of PI3 KCA and PI3 KCB were detected by immunohistochemistry. The correlations between PI...