Meningioma, Radiation-Induced
Following radiotherapy, secondary cancer may occur after a long latent period. Zattara-Cannoni et al. (2001) reported cytogenetic studies of 6 cases of radiation-induced meningiomas. Two of the cases occurred after radiation for tinea capitis, after an interval of 17 and 54 years, respectively; in the first of these cases, local recurrence occurred after an additional period of 29 years. Using spectral karyotyping (SKY) and comparative genomic hybridization (CGH), Zattara-Cannoni et al. (2001) found that all 6 cases had the same chromosome abnormality, t(1;22)(p11;q12). They suggested that a gene on chromosome 1p11 is involved in radiation-induced meningiomas. A locus in the 22q12.3-qter region is a well-established site of mutation causing meningioma (see 156100).