Comparison between high-dose and low-dose intravenous methylprednisolone therapy in patients with brain necrosis after radiotherapy for nasopharyngeal carcinoma.

BACKGROUND: Radiotherapy is the standard radical treatment for nasopharyngeal carcinoma (NPC) and may cause radiation-induced brain necrosis (RN). Intravenous steroids have been considered as an effective treatment for RN. However, evidence concerning the efficacy of different doses of intravenous steroid therapy remains insufficient to establish the optimal regimen for NPC patients with RN. METHODS: We retrospectively reviewed charts of 169 patients who were diagnosed with RN after radiotherapy for NPC, treated with low-dose or high-dose intravenous methylprednisolone (IVMP) and followed up for 12 months. We collected the clinical data, including the Late Effects of Normal Tissue (LENT)/Subjective, Objective, Management, Analytic (SOMA) scales score and Montreal Cognitive Assessment (MoCA) score. Magnetic resonance imaging (MRI) was performed pre- and post-treatment to define the radiographic response. RESULTS: There were no significant differences in the treatment response based on MRI, or changes in clinical symptoms and cognitive function between low and high-dose groups. Thirty of 93 low-dose patients (32.3%) and 21 of 76 high-dose patients (27.6%) presented effective response in MRI, with no significant differences between groups (P = 0.515). Neither group showed a significant difference in the effective rate based on the MoCA total score and LENT/SOMA score. The most commonly reported grade 3 adverse events in the high-dose group (n = 76) were infections and infestations (3 [3.9%] vs. none for low-dose group). CONCLUSIONS: We found low-dose IVMP was not inferior to high-dose IVMP for NPC patients with RN. In addition, treatment-related infections and infestations were likewise more common with high-dose steroid than low-dose steroid.