Groups received either GNC-039 (n=5), GNC-039 with engrafted PBMC (n=5), Temozolomide(n=5), or Vehicle (n=5). However, beyond this timepoint, the level of GNC-039 in the brain region was significantly increased due to the engrafted PBMC.Collectively this data indicates the functionality of GNC-039 as a multi-specific T cell engager with the potential to target EGFRvIII+ cancer cell cytolysis in primary brain disease. The clinical phase I-b study of GNC-039 is under way and the available data exhibit strong signals of efficacy with acceptable tolerability.