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Chimeric antigen receptors (CARs) combine an antibody-based binding domain (and single chain fragment variable region, scFv) with T cell receptor signaling domains (CD3 zeta with a costimulatory domain, typically CD28 or 41BB). When T cells express CARs, they are activated in a major histocompatibility complex- (MHC) independent manner to kill tumor cells expressing the target to which the scFv binds.  CAR T cells targeting the B cell antigen CD19 have resulted in remissions in 60-80% of patients with pre-B cell precursor acute lymphoblastic leukemia (BCP-ALL).

In the United States alone, one of four cancer deaths occur from lung cancer and there are over 8 million individuals considered to be at high-risk due to cigarette smoking and other behaviors. It's well known that early detection of cancer significantly improves survival of this disease, however a lack of lung cancer screenings and analysis precludes fast results at a low cost.