ERBB2 and anaplastic astrocytoma: In Reszeć’s study [9] on sixty-five patients with astrocytic tumors, including 17 diffuse astrocytomas, 23 anaplastic astrocytomas, and 25 GBMs, HER2 expression was observed in 88.3%, 88%, and 82.6% of diffuse astrocytoma, anaplastic astrocytoma, and GBM, respectively.