Most middle-aged, anaplastic astrocytoma showed the peak incidence at 50 years of age, while the glioblastoma multiforme tumor incidence peaks about 10 years later.

• 中年人最多，间变性星形胶质细胞瘤发病在50岁呈高峰，而多形性胶质母细胞瘤发病高峰晚10年左右。