In the PRAME positive HLA-A*02:01 positive cell lines, IMC-F106C redirected donor effector cells to release IFNγ and GrB and kill tumor cells in a dose-dependent manner, with activity demonstrated as low as < 1 pM. By contrast, cell lines negative for PRAME or HLA-A*02:01 expression failed to induce responses < 1 nM of IMC-F106C.