Objective To investigate the expression of hypoxia-inducible factor-1α(HIF-1α) and p53 protein in the development and malignant progression of astrocytomas.Methods The expressions of HIF-1α,p53 were studied by SP immunohistochemistry in 59 cases of astrocytomas.Results (1)The expression rate of HIF-1α protein and p53 protein was 47.5%(28/59) in 59 cases of astrocytomas.(2)The expression rates of HIF-1α protein were 31.8%(7/22),50.0%(10/20) and 64.7%(11/17) in grade Ⅰ,grade Ⅱ and grade Ⅲ, respectively(P<0.05...