TASL and oligoastrocytoma: TASL expression levels in tumor tissues of patients over 45 years of age were higher than those of patients 45 years of age and younger (P < 0.01, Fig. 8D); TASL expression levels in tumor tissues of patients with glioblastoma multiform were higher than those of patients with oligodendrogliomas, oligoastrocytomas, and astrocytomas (P < 0.001, Fig. 8E).