Observation or Radiation Therapy in Treating Patients With Newly Diagnosed Grade II Meningioma That Has Been Completely Removed by Surgery
PRIMARY OBJECTIVES: I. To determine, in terms of progression-free survival (PFS), the extent of clinical benefit of the addition of adjuvant radiotherapy (RT) to gross total resection (GTR) for patients with newly diagnosed World Health Organization (WHO) grade II meningioma. SECONDARY OBJECTIVES: I. Overall survival (OS). II. Disease-specific survival (DSS)....