KLRK1 and glioblastoma: To determine the cytotoxic capacity of NKG2D-BBz CAR-T cells against glioblastoma cells, we incubated T cells with T98G, U-251MG, and U-87MG glioblastoma cell lines at different E:T ratios of 8:1, 4:1, 2:1, 1:1, and 0.5:1.