In the present study, the expression of BAI1 was evaluated in normal human brain tissues and astrocytoma specimens of various grades, and then the correlation between BAI1 expression and microvessel density (MVD) labeled with CD105 (endoglin) was analyzed to investigate whether BAI1 may be used as a marker for angiogenesis in astrocytomas. Here, ENG is linked to astrocytoma (excluding glioblastoma).