As shown in Figure 4D, GBM, recurrent GBM, anaplastic astrocytoma, recurrent anaplastic astrocytoma, and recurrent astrocytoma had lower STEAP2 expression, while oligodendroglioma, astrocytoma, recurrent oligodendroglioma, anaplastic oligodendroglioma, and recurrent anaplastic oligodendroglioma had higher STEAP2 expression. This evidence concerns the gene STEAP2 and astrocytoma (excluding glioblastoma).