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Survival analysis of B7-H1 expression in nuclei of cancer cells in human esophageal cancer tissues. A. Positive B7-H1 expression in nuclei of cancer cells in esophageal cancer tissue, scale bar = 100 μm. B. The log-rank survival analysis showed that there was no statistically significant difference in prognosis between the patients with positive nuclear B7-H1 staining and the patients with negative nuclear B7-H1 staining, P = 0.6755.
