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Life sciences · Journal article
Theoretical and Natural Science · October 20, 2026
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Chimeric antigen receptor (CAR)‑T cell therapy has shown significant results in treating blood cancers, but it is not widely used for other reasons: high production costs, long-term manufacturing cycles, severe toxicity, and relatively poor efficacy against solid tumors. The two main directions of improvement have developed in parallel: "armoring" strategies that equip CAR-T cells with additional functional modules to counteract the immunosuppressive tumor microenvironment (TME), and non-viral engineering platforms that eliminate viral vectors to enhance safety and shorten production. Each approach has shown good clinical results but faced different translational barriers. This paper critically examines the current evidence for both strategies, identifies the remaining problems, and puts forward that non-viral platforms may serve as the enabling framework for the safe and effective clinical application of armored CAR-T products. The following are the main problems discussed in this paper: efficacy in solid tumors, compounded toxicity risks and regulatory standardization; corresponding countermeasures are proposed to provide a path for their eventual application in daily clinical practice.