Figure 1

Immunohistochemical expression of X-linked-chromosome inhibitor of apoptosis (XIAP) protein and nuclear factor-κB (NF-κB) in esophageal squamous cell carcinoma (ESCC). (A) typical immunohistological features with high levels of XIAP expression in ESCC. The XIAP staining shown cytoplasmic localization; (B) typical immunohistological features with lower levels of XIAP expression in ESCC; (C) typical immunohistological features with high levels of NF-κB in ESCC. The NF-κB staining was present in the nucleus and cytoplasm of tumor cells; (D) negative staining in ESCC. Magnifications × 200.