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Objective: To evaluate the relation of EB virus latent membrane protein-1 (LMP-1) and the phenotype of epithelial-mesenchymal transition (EMT) and cervical lymph node metastasis in nasopharyngeal carcinoma., Method: Based on histopathology and MRI imaging, nasopharyngeal biopsy tissues from 88 patients with nasopharyngeal carcinoma were divided into 3 groups: pathologic metastasis (18), MRI metastasis(40) and without metastasis (30). The expressions of LMP-1, STAT3, Twist, E-Cadherin and Vimentin were examined immunohistochemically in biopsy tissues., Result: LMP-1 expression was found in 35 of 88 biopsy tissues with a positive rate of 38.7%. The positive rates of LMP-1 in groups of pathologic metastasis, MRI metastasis and without metastasis were 38.9% (7/18), 47.5% (19/40) and 30.0% (9/30), respectively, and significant difference were not found among three groups. The expression of LMP-1 was positively correlated to both expressions of Twist and Vimentin (r = 0.276 and 0.282, are P < 0.01), but not to both expressions of STAT3 and E-Cadherin. The positive expressions or abnormal expression of STAT3, Twist, Vimentin and E-Cadherin were found in 57 of 88 (64.8%), 48 of 88 (54.5%), 22 of 88 (20.0%)and 53 of 88 (60.2%), respectively. Significant differences in the expression of STAT3, Twist, Vimentin and E-Cadherin were all found among groups of pathologic metastasis, MRI metastasis and without metastasis, respectively (are P < 0.05). The expression of STAT3 was positively correlated to both expressions of Twist and Vimentin (r = 0.712 and 0.316, P < 0.01)., Conclusion: EMT plays important role in cervical lymph node metastasis in nasopharyngeal carcinoma. LMP-1 may be only as one of upstream factors associated with the EMT, but not the decisive factor for cervical lymph node metastasis.

Objective: To study the expression and its significance of STAT3, STAT5, Survivin and Ki67 in the Epstein-Barr virus associated nasal NK/T cell lymphoma., Method: The expression of STAT3, STAT5, Survivin and Ki67 were detected with immunohistochemistry in 25 cases of nasal NK/T cell lymphoma, and their relationship was analyzed. Nasal cavity tissues from 20 cases of chronic sinusitis were as the control group., Result: The positive rates of STAT3 in the lymphoma and in control group were 56% and 10%, respectively (P <0.01). The positive rates of STAT5 in the lymphoma and in control group were 68% and 15%, respectively (P <0.01). The positive rates of Survivin and Ki67 of nasal NK/T cell-lymphoma were 68% and 72%, respectively; but it in the control group was 0% and 20%, respectively, P <0.01. The expression of STAT3 was positively related to that of Survivin and Ki67(r =0. 428, P <0. 05 and r =0. 704, P <0. 01); The expression of STAT5 was not related to that of Survivin and Ki67., Conclusion: The pathway of STAT may play a role in the development of nasal NK/T cell lymphoma. STAT maybe take part in the formation of nasal NK/T cell lymphoma through induction of Survivin and Ki67.