Similarly, we optimized gene-circuits to confer resistance to the immunosuppressive effects of TGFb; anti-CEA CAR-NK cells armed with TGFb-blocking constructs sustained target-cell killing in the continuous presence of TGFb. Conclusions SENTI-401 incorporates NOT-Gating and Multi-Arming gene-circuits into CAR-NK cells in order to improve the therapeutic window and efficacy of CEA-targeting cell-therapies for the treatment of solid tumors.