ABSTRACT
Objective To investigate the expressions of TESTIN gene and Caspase-3 protein and thier relations with the clinicopathological features and prognosis of esophageal squamous cell carcinomas(ESCC). Methods The expressions of TESTIN and Caspase-3 in 50 ESCC tissues and paracancerous tissues (＞5 cm apart form the ESCC tissue) were detected by immunohistochemistry.The expression of TESTIN in 65 matched-pairs of ESCC tissues was detected by Western blotting and RT-PCR. The association of TESTIN and Caspase-3 with clinicopathological features and prognosis of ESCC were analyzed. Results The immunohistochemistry examination showed that the positive rates of TESTIN protein [30. 0% (15/50)] and Caspase-3 protein [24.0% ( 12/50)] were significantly lower in ESCC tissues than those in paracancerous tissues [(84. 0% (42/50) and 94. 0% (47/50),respectively, P＜0.01)]. The mRNA level of TESTIN was down-regulated in ESCC tissues (P＜0.05). Whereas the protein level of TESTIN was down-regulated in 45 (69.2%) of 65 ESCC tissues in comparison with paracancerous tissues. TESTIN expression was positively correlated with the differentiation of ESCC, but not associated with gender, age, tumor size, TNM stage and lymph node metastasis. There was a positive correlation between TESTIN and Caspase-3 in protein expressions (P＜0. 05). Patients with negative expression of TESTIN had lower survival rate compared to those with positive expression (P＜0. 05). Conclusions The positive relation between low-expression of TESTIN and Caspase-3 implicates that both are involved in the development of esophageal squamous cell carcinogenesis, and TESTIN might be a novel ESCC marker with prognostic significance.