The purpose of this research study is to find out whether adding an experimental vaccine called rindopepimut (also known as CDX-110) to the commonly used drug bevacizumab can improve progression free survival (slowing the growth of tumors) of patients with relapsed EGFRvIII positive glioblastoma.
This Phase II study will enroll patients into two groups. Group 1 are patients who have never been treated with bevacizumab. These patients will be randomly assigned to receive either rindopepimut/GM-CSF or KLH, each along with bevacizumab. Treatment assignment for Group 1 will be blinded. Group 2 patients are those who are refractory to bevacizumab (experienced recurrence or progression of glioblastoma while on bevacizumab). These patients will all receive rindopepimut/GM-CSF along with bevacizumab. Patients will be treated until disease progression or intolerance and all patients will be followed for survival. Patients may be treated with other therapies that are not part of the study after discontinuing treatment with the study vaccine.