Morbidity and Mortality Associated With Meningioma After Cranial Radiotherapy: A Report From the Childhood Cancer Survivor Study

Abstract

Purpose Little is known about neurologic morbidity attributable to cranial radiotherapy (CRT) –associated meningiomas. Materials and Methods From 4,221 survivors exposed to CRT in the Childhood Cancer Survivor Study, a diagnosis of meningioma and onset of neurologic sequelae were ascertained. Cox proportional hazards regression was used to estimate hazard ratios (HR) and 95% CIs to evaluate the factors associated with neurologic sequelae after subsequent meningioma. Results One hundred ninety-nine meningiomas were identified among 169 participants. The median interval from primary cancer to meningioma diagnosis was 22 years (5 to 37 years). The cumulative incidence of a subsequent meningioma by age 40 years was 5.6% (95% CI, 4.7% to 6.7%). CRT doses of 20 to 29.9 Gy (HR, 1.6; 95% CI,1.0 to 2.6) and doses ≥ 30 Gy (HR, 2.6; 95% CI, 1.6 to 4.2) were associated with an increased risk of meningioma compared with CRT doses of 1.5 to 19.9 Gy ( P < .001). Within 6 months before or subsequent to a meningioma diagnosis, 20% (30 of 149) reported at least one new neurologic sequela, including seizures (8.3%), auditory-vestibular-visual deficits (6%), focal neurologic dysfunction (7.1%), and severe headaches (5.3%). Survivors reporting a meningioma had increased risks of neurologic sequelae > 5 years after primary cancer diagnosis, including seizures (HR, 10.0; 95% CI, 7.0 to 15.3); auditory-vestibular-visual sensory deficits (HR, 2.3; 95% CI, 1.3 to 4.0); focal neurologic dysfunction (HR, 4.9; 95% CI, 3.2 to 7.5); and severe headaches (HR, 3.2; 95% CI, 1.9 to 5.4). With a median follow-up of 72 months after meningioma diagnosis (range, 3.8 to 395 months), 22 participants (13%) were deceased, including six deaths attributed to a meningioma. Conclusion Childhood cancer survivors exposed to CRT and subsequently diagnosed with a meningioma experience significant neurologic morbidity.