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Abstract
Pseudomonas aeruginosa exotoxin A-based immunotoxins (PE-ITs) are fusion proteins that harness targeting and toxin moieties. Structural optimizations in PE and targeting moieties were implemented to lower their immunogenicity and alleviate undesirable side effects. PE moiety was engineered to lack its cell-binding domain and T cell epitope regions, whereas single chain (scFv) and disulfide Fv portions (dsFv), nanobodies, and monobodies were utilized as targeting moieties. This review discusses applications of PE-ITs on different types of cancer, structural optimizations to reduce PE-ITs drawbacks, and recent modifications applied for efficient therapeutic delivery. Finally, we draw attention to the possibility of combining radiotherapy, radionuclides, and RGDs with PE-IT to improve overall response rates of IT-based treatments and reduce cancer cell resistance.
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