borderline significancep = 0.059
Cumulative multivariate analyses of SM together with MM adjusted for age, sex, tumor location, the extent of resection, and the WHO grade of the tumors further showed high-grade histology (HR 6.06, 95% CI 3.20–11.47; p < 0.001), synchronous or metachronous meningioma growth (HR 4.50, 95% CI 2.26–8.96; p < 0.001) and, with borderline significance, STR (HR 2.38, 95% CI 0.97–5.83; p = 0.059) as independent predictors for progression.