ABSTRACT
Objective To detect Snail and Raf kinase inhibitor protein (RKIP) expressions in NSCLC (Non-Small Cell Lung Cancer) and their relationship with the pathological characteristics of tumor. Methods Immunohistochemistry was used to detect Snail and RKIP expression in 124 NSCLC samples and 67 paraneoplastic normal lung tissue samples. Snail and RKIP positive expression rates were compared upon clinicopathologic characteristics. Correlation of Snail expres-sion with RKIP expression was also analyzed. Results Positive expression rate of Snail was 79.03%in lung cancer, which is higher than that in normal lung tissue 19.40%(χ2=63.538, P＜0.01);positive expression rate of RKIP was 36.29%in lung cancer which is lower than that in normal lung tissue 77.61%(χ2=29.716,P＜0.01), Snail and RKIP expressions are corre-lated with tumor differentiation, TNM stage, lymph node metastasis and postoperative survival time ( P＜0.05, respectively) . Snail protein expression is negatively correlated with RKIP expression in NSCLC (P＜0.05). Conclusion High Snail ex-pression and the low RKIP expression might be important biological markers for invasion and metastasis of NSCLC, which might be used as important prognostic indicators in NSCLC.
ABSTRACT
RKIP (Raf kinase inhibitor protein) is a member of PEBP (phosphatidylethanolamine-binding protein) family, which plays a pivotal modulatory role in MAPK (mitogen-activated protein kinase), CPCR (G-protein-coupled receptor) and NF-KB (nuclear factor-kappa B) signaling transduction pathways. In recent years, many studies reported that RKIP expression is weakened or lost in a series of malignant tumors such as prostate cancer, breast cancer and melanoma. RKIP may also play an important role in inhibition of tumor metastasis via inhibition of cell invasion and tumor angiogenesis. Recently, many experiments revealed that RKIP which is a metastasis-suppressor gene participates in the suppression of metastasis in a variety of digestive system malignant tumors and it will become a new target for prevention and control of digestive system cancer. In this article, the advances of research on RKIP in common digestive system malignant tumors were reviewed. Copyright © 2013 by TUMOR.