CDKN2B and meningioma: Some genetic alterations discovered in higher grade meningioma are deletions on 1p, 6q, 10q, 14q, 9p (CDKNA, p14ARF, CDKN2B) and 18q chromosomes and gains on 1q, 9q, 12q, 15q, 17q, and 20q [77,78,79,80,82].