Here we will present results of a phase I/II open label, non-randomized study that investigated the safety and single agent activity of L19TNF for patients with isocitrate dehydrogenase (IDH) wildtype World Health Organization (WHO) grade 3 or 4 glioma at first relapse....These studies showed a treatment-associated emerging tumor necrosis and changes in the complex immune infiltrate in the tumor tissue upon L19TNF, suggesting a local anti-tumor immune response.