In another study of 255 meningiomas, including 63 WHO grade 1, 173 grade 2, and 19 grade 3 meningiomas, the authors found ARID1A, SMARCA4, and SMARCB1 mutations in 17.3, 3.5, and 5.1% of samples, respectively [177]. The gene discussed is ARID1A; the disease is meningioma.