ABSTRACT
Objective To investigate the role of COOH-terminus tensin like molecule (CTEN) in epithelial-mesenchymal transformation of gastric cancer and its prognostic factors.Methods The expressions of CTEN,E-cadherin and Vimentin in 220 patients with gastric cancer were detected by immunohistochemical staining.Results The positive expression rate of CTEN was 61.8％ (136/220) in gastric cancer specimens,higher than 15％ (3/20) in adjacent tissues (x2 =16.488,P ＜0.01);the positive expression rate of E-cadherin in gastric cancer specimens was 25.5％ (56/220),lower than 85％ (17/20) in adjacent tissues (x2 =30.713,P ＜0.01);and the positive expression rate of Vimentin in gastric cancer specimens was 35.0％ (77/220),higher than 10％ (2/20) in adjacent tissues.There was no significant difference in the expression of CTEN between different genders,ages,size of tumors and histopathological types (P ＞ 0.05).In different infiltration depth,the CTEN expression difference were statistically significant (x2 =54.058,P ＜0.01),CTEN expression rate in lymph node metastasis group was obviously higher than without lymph node metastasis group (x2 =15.989,P ＜0.01),and CTEN expression rate in distant metastasis group was obviously higher than without distant metastasis group (x2 =4.143,P ＜0.01).CTEN and E-cadherin expression in gastric cancer tissue showed a negative correlation (r =0.357,P ＜ 0.01),while CTEN and Vimentin expression were positively correlated (r =0.498,P ＜0.01).220 cases of patients with gastric cancer received follow-up.Median survival time of CTEN negative express group was 48.2 months (95％ confidence interal,44.0-52.5 months),69.0％ for the 5-year cumulative survival rate.The survival analysis showed median survival time of CTEN positive expression group was 41.8 months (95％ confidence interal,38.3-45.3 months),48.5 ％ for the 5-year cumulative survival rate,which were lower than that in negative group (x2 =4.884,P ＜ 0.05).Multifactor analysis showed CTEN expression,lymph node metastasis and distant metastasis were independent risk factors for the prognosis of gastric cancer patients (P ＜ 0.05).Conclusions CTEN was positively correlated with gastric cancer invasion and metastasis,and played an important role in gastric cancer epithelial mesenchymal transformation.CTEN is independent risk factor for prognosis of gastric cancer,detection of CTEN gene mutation has important significance to evaluate the treatment and prognosis of gastric cancer.