Choy B, Bandla S, Xia Y, Tan D, Pennathur A, Luketich JD, Godfrey TE, Peters JH, Sun J, Zhou Z. Clinicopathologic characteristics of high expression of Bmi-1 in esophageal adenocarcinoma and squamous cell carcinoma. BMC Gastroenterol. 2012; 12:146. PMID: 23078618.