association of elevated grp78 expression with increased astrocytoma malignancy via akt and erk pathways unlike other members of hsp70 family grp78 manifests multifaceted subcellular distribution and forms complex with different signals resulting in its close correlation with various tumors however its expression profile and function in glioma remain less well defined in this study normal brain tissue and astrocytic tumor specimens were evaluated for grp78 expression which was shown to be upregulated in astrocytoma compared with normal tissue increased markedly as astrocytoma pathologic grade escalates and can still be enhanced for disease recurrence by employing cox regression analyses high grp78 expression was correlated with a poorer outcome for recurrent glioblastoma patients in addition immunofluorescence microscopy detected cell surface positioning of grp78 on human glioma cells after transfection with sirna or antibody ligation of surface grp78 phosphorylation of akt and erk was attenuated these findings indicate that grp78 plays an important role in astrocytoma malignancy whereas its cell surface localization may be attractive for clinical utilization