%0 Journal Article %T Systemically targeted cancer immunotherapy and gene delivery using transmorphic particles. %A Asavarut P %A Waramit S %A Suwan K %A Marais GJK %A Chongchai A %A Benjathummarak S %A Al-Bahrani M %A Vila-Gomez P %A Williams M %A Kongtawelert P %A Yata T %A Hajitou A %J EMBO Mol Med %V 14 %N 8 %D 08 2022 8 %M 35758207 %F 14.26 %R 10.15252/emmm.202115418 %X Immunotherapy is a powerful tool for cancer treatment, but the pleiotropic nature of cytokines and immunological agents strongly limits clinical translation and safety. To address this unmet need, we designed and characterised a systemically targeted cytokine gene delivery system through transmorphic encapsidation of human recombinant adeno-associated virus DNA using coat proteins from a tumour-targeted bacteriophage (phage). We show that Transmorphic Phage/AAV (TPA) particles provide superior delivery of transgenes over current phage-derived vectors through greater diffusion across the extracellular space and improved intracellular trafficking. We used TPA to target the delivery of cytokine-encoding transgenes for interleukin-12 (IL12), and novel isoforms of IL15 and tumour necrosis factor alpha (TNF α ) for tumour immunotherapy. Our results demonstrate selective and efficient gene delivery and immunotherapy against solid tumours in vivo, without harming healthy organs. Our transmorphic particle system provides a promising modality for safe and effective gene delivery, and cancer immunotherapies through cross-species complementation of two commonly used viruses.