PDGFB and meningioma: In PGDStv-a;RCAS-PDGF-B;AdCre;Nf2flox2/flox2; Cdkn2ab−/− mice, the frequency of meningiomas (15 of 19 mice; 79%) was not statistically different compared to control AdCre;Nf2flox2/flox2; Cdkn2ab−/− mice (38 of 53 mice; 72%).