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Immunohistochemical score of Bmi-1 in esophageal squamous cell carcinoma (ESCC). A. No Bmi-1 expression in ESCC (score 0); B. Bmi-1 weakly positive cells distributed evenly in ESCC (score 1+); C. Bmi-1 moderately positive cells distributed evenly in ESCC (score 2+); D. Bmi-1 strongly positive cells in ESCC (score 3+).
