Programmable cell therapies wire multiple antigen-sensing receptors into a synthetic logic circuit inside the cell, so the engineered T cell only attacks when the exact combination of antigen signals matching a tumor cell is present.
fire = AND(antigenA, antigenB) AND NOT(healthyTissueMarker)
- Antigen-sensing nodes — synthetic receptor modules, each recognizing one tumor-associated or healthy-tissue antigen.
- Circuit connectivity — how the sensing nodes are logically wired together (AND/OR/NOT gates) before triggering the killing response.
- Antigen signal strength — how strongly each receptor node is engaged by antigen present on a nearby cell.
- Logic-gate strictness — how strictly the circuit requires the full combinatorial antigen pattern before activating, reducing off-target killing.
Combinatorial-antigen CAR-T circuits (AND-gated or NOT-gated 'synNotch' designs) are specifically engineered to solve the on-target/off-tumor toxicity problem, only killing cells that match a tumor-specific antigen combination absent from healthy tissue.