PTEN and meningioma: Moreover, a mutual co-occurrence of ARID1A mutations was detected in a subset of meningiomas that harbored aberrations of CDKN2A/B (n = 18), KDM6A (n = 16), PTEN (n = 13), FBXW7 (n = 3) and SUFU (n = 7), as shown in Fig. 3.