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Life sciences · Journal article
Pharmaceutical Science Advances · July 8, 2026
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Adoptive immune cell therapies, exemplified by chimeric antigen receptor T cells, have transformed the treatment of hematological malignancies. However, their broader clinical application is limited by complex ex vivo manufacturing, high cost, and safety concerns. In vivo immune cell engineering has emerged as an alternative strategy that delivers genetic instructions directly to immune cells, thereby generating or modulating therapeutic immune cells within the body and reducing the reliance on individualized in vitro operations. These advances underscore the need for a systematic evaluation of this emerging field. Therefore, this review systematically summarizes the mechanistic principles and delivery strategies underlying in vivo immune cell engineering, with an emphasis on in vivo CAR-T cell generation and the engineering of other immune cells. We then discuss major viral and non-viral delivery platforms and clarify how these platforms influence cargo delivery, cell specificity, and functional immune-cell programming. We further discuss recent preclinical and emerging clinical advances across cancer, autoimmune diseases, and degenerative diseases, while examining key translational challenges, including delivery specificity, off-target effects, controllability, persistence, and manufacturing standardization. Overall, although the field of in vivo immune cell engineering is advancing rapidly, its clinical success will depend on coordinated improvements in delivery precision, therapeutic efficacy, safety, and controllable immune-cell programming.