Whole brain radiotherapy with concurrent temozolomide in multifocal and/or multicentric newly diagnosed glioblastoma

The standard medical care of glioblastoma (GBM) patients with good performance status is based on focal brain radiotherapy (40–60 Gy) with concurrent temozolomide (TMZ) followed by adjuvant TMZ. Newly diagnosed multifocal and/or multicentric GBM (M/M GBM) cases are usually treated with TMZ alone: whole brain chemoradiotherapy (CRT) is avoided for safety reasons. To our knowledge, no study has investigated the safety and efficacy of whole-brain radiotherapy (WBRT) with concurrent TMZ in M/M GBM patients. This retrospective study sought to assess the role of WBRT associated with concurrent TMZ followed by TMZ alone in this population. Eleven patients with pathologically proven M/M GBM (≥3 lobes) were treated with WBRT between April 2009 and September 2017. The median age was 50 years [34–74]. The median dose of radiotherapy was 45 Gy at 1.8 Gy per fraction over 37 days [29–41], with concurrent daily TMZ at the dose of 75 mg/m2. This treatment was followed by adjuvant monthly TMZ (150 mg/m2-D1-D5). All pathology slides and radiology images were reviewed. The median overall and progression-free survival times for all patients were 10 months [4–25] and 5 months [3–21], respectively. There was no grade 3–4 toxicity due to radiotherapy. One patient stopped the TMZ during the radiochemotherapy period and 9 patients received adjuvant TMZ with a median number of 5 cycles [2–8]. Our study supports the safety and the efficacy of WBRT with TMZ in newly diagnosed M/M GBM. Larger prospective studies are needed to support our results.