放射線治療が悪性転化を惹起するか

Malignant Transformation of Benign Meningiomas with or without Radiotherapy

Point

・良性髄膜腫の悪性化は2.98/1,000 patient-yearsで起こり，頭蓋底腫瘍では頻度が低い．

・定位放射線治療後の悪性化はそれより低いが，母集団構成が異なっており比較できない．

・放射線治療に伴う二次癌や腫瘍悪性化率は，遺伝性腫瘍疾患では個別に考慮する必要がある．

　Most meningiomas are benign, slow growing tumors, which rarely progress to a higher grade. The incidence rate of malignant progression is estimated to be 2.98/1000 patient-year. However, non-skull base location is a significant risk factor for progression. The median time to malignant progression is 4.3 years; however, the cumulative rate of progression approaches a plateau after 10 years. Although radiosurgery does not appear to increase the incidence rate（0.5/1000 patient-year）, exact comparisons have been difficult because of differences in study populations. The median time to progression is 7.0 years from initial diagnosis and 5.0 years from radiosurgery. The cumulative rate appears to increase even after 10 years. The risk of malignant transformation after radiotherapy may increase in patients with tumor-prone syndromes, with some controversies regarding patients with neurofibromatosis type 2. Although short term follow-up in patients with meningioma suggests that radiosurgery is safe, there is uncertainty regarding its use in pediatric patients, and those with tumor-prone syndromes.