Long-Term Analysis of NRG Oncology RTOG 0539: A Phase II Trial of Observation for Low-Risk Meningioma and Radiotherapy for Intermediate- and High-Risk Meningioma. - Kotecha R; Polley MY; Vogelbaum MA; Perry A; Ashby L; Modi JM; Alleman AM; Tsien CI; Barani IJ; Li J; Braunstein S; Whitton AC; et al. (Journal of clinical oncology : official journal of the American Society of Clinical Oncology, 2026)