PTEN and oligodendroglioma: Further, querying for histological subtypes of LGG, it was seen that PTEN overexpression was associated with better survival in all histological subtypes: oligodendroglioma, astrocytoma, and oligoastrocytoma (Fig. 2e, g, Kaplan–Meier analysis, p-value = 0.03, 0.024 and 0.014 respectively, samples stratified by > median or < median of PTEN expression).