IDENTIFICATION OF A CONSISTENT REGION OF ALLELIC LOSS ON 1P32 IN MENINGIOMAS - CORRELATION WITH INCREASED MORBIDITY

Meningioma is a common tumor of the central nervous system. Deletions of the short arm of chromosome 1 (1p) are the second most commonly obs erved chromosomal abnormality in these tumors. Here, me analyzed tumor and normal DNAs from 157 meningioma patients using PCR-based polymorp hic loci. Loss of heterozygosity (LOH) for at least one informative ma rker on 1p was observed in 54 cases (34%), whereas LOH on 1q occurred in only 9 cases (8%). sigh-resolution deletion mapping defined a conse nsus region of deletion flanked distally by D1S2713 and proximally by D1S2134, which spans 1.5 cM within 1p32. LOH in this region has also b een observed in several other malignancies, suggesting the presence of a tumor suppressor gene or genes that are important for several types of cancer, Statistical analysis revealed that 1p LOH was associated w ith chromosome 22 deletions and with abnormalities of the NF2 gene in meningioma, In addition, unlike other clinical and molecular character istics, only 1p LOH was shown to be significantly associated with recu rrence-free survival.