Eph tyrosine kinase receptors and their ephrin ligands are involved in normal development and tumorigenesis. Eph receptors are frequently over expressed in a wide variety of human malignant tumors, being associated with tumor growth, invasion, angiogenesis, and metastasis. This study aimed to evaluate the clinical significance of EphB4 and its ligand of ephrinB2 protein expressions in human lung adenocarcinomas. EphB4 and ephrinB2 protein expressions were assessed immunohistochemically on paraffin embedded tissues obtained from 93 patients with lung adenocarcinoma. Fifty-one out of 93 (54.8%) specimens were negative for EphB4 expression, and 42 out of 93 (45.2%) were positive for EphB4 expression. EphrinB2 expression was consistently negative in all tissues. EphB4 expression was significantly associated with tumor differentiation ( = 0.001), lymph node metastasis ( = 0.021), and Ki67 ( = 0.012). No significant relationship was found between EphB4 expression and gender, age, or ALK mutation. Our data show that EphB4 is differentially expressed in lung adenocarcinoma tissues. A high level of EphB4 protein expression was associated with lymph node metastasis in lung adenocarcinoma.
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