Objective To examine the expression of KLF5 in 4NQO-induced mouse tongue carcinogenesis. Methods Forty-two C57BL /6J mice were divided into two groups,control group( without any treatment) and 4NQO group,in which the mice were given 4NQO( 50μg /ml) in drinking water for 16 weeks. At the end of 24thweek,the mice were sacrificed and their tongues were harvested for HE staining and immunohistochemistry. Results HE staining showed that normal stratified squamous epithelium were observed in the tongues of the co...