We will conduct a phase II single arm trial of Palonosetron (PALO) for the prevention of RINV in primary malignant glioma patients receiving radiation therapy (RT) and concomitant temozolomide (TMZ). All eligible patients should receive a planned total dose of 54-60 GY of radiation and 75 mg/m2 of daily temozolomide for a total of six weeks of treatment. For each week of radiation patients will receive a single 0.25 mg intravenous dose of palonosetron approximately 30 minutes before each week of radiation fraction. This schedule will be repeated for each week of radiation for a total of 6 weeks. After the start of radiation the type of rescue medication will be up to the investigator's discretion (however given the results of recent published phase II study by Navari et. al. we recommend using olanzapine for rescue medication). All patients will be given written informed consent.