Dose escalation continues with MT-6402 (QW in 4-week cycles) in pts with relapsed/refractory PD-L1+ solid tumors...MT-6402 utilizes three PD-L1-targeted and unique MOAs: direct cell-kill, reduced immunosuppression, and increased immunorecognition…A PR in 1 pt with CPI-refractory NPC (CPS 2%, CMV-) and regression of osseous metastases in a pt...(TPS 80%, HLA-A*02/CMV+) following disease progression on CPI occurred...These results show MT-6402 monotherapy activity though unique MOAs and provide rationale for MT-6402 dose expansion.