A consistent region of deletion on 1p36 in meningiomas: identification and relation to malignant progression

We analyzed the genetic aberrations on chromosome arms I p, 10q, and 14q, which are thought to be loci that include putative tumor suppressor genes in meningiomas. We initially conducted molecular genetic testing on a total of 72 tumors including 15 atypical and 8 anaplastic jueningiomas using double-target fluorescence in situ hybridization. An incidence of deletion of I p was observed in 16.3% of histologically benign, 86.7% of atypical, and 87.5% of anaplastic meningiomas. Microsatellite analysis for loss of heterozygosity on I p, 10q, and 14q was performed in 15 tumors (6 benign, 6 atypical, and 3 anaplastic meningiomas). We detected a limited deleted region on I p36 in two tumors and Suggest a new consistent region of deletion at 1p36.21similar top23 distal to D1S507 and proximal to D1S214, which spans 8.21 megabases. In addition, loss of 10q was detected in two of three secondary atypical meningiomas, and loss of 14q in two of three primary anaplastic meningiomas. We suggest that one of the putative suppressor genes is located at 1p36.21similar top23, and that 10q loss may contribute to the malignant progression from benign to atypical meningiomas. (C) 2003 Elsevier Science Inc. All rights reserved.