Validity of Prognostic Grading Indices for Brain Metastasis Patients Undergoing Repeat Radiosurgery

We tested the validity of 5 prognostic indices, Recursive Partitioning Analysis (RPA), Score Index for Radiosurgery (SIR), Basic Score for Brain Metastases (BSBM), Graded Prognostic Assessment (GPA), and Modified-RPA, for patients who underwent repeat stereotactic radiosurgery (re-SRS).For this study, we used our database, which included 804 patients who underwent gamma knife re-SRS during the period 1998-2013.There were statistically...