Advanced therapy medicinal products (ATMPs) are engineered to replace defective, disease-causing genes to compensate directly for a genetic defect or to encode a therapeutic protein construct (e.g., chimeric antigen receptor, CAR) for disease treatment. In most instances, a viral vector delivers the engineered genetic payload, targeting cells in situ or ex vivo through cellular modification, expansion, and infusion into a patient. Clinical successes of ATMPs bolstered by regulatory approval of products such as Luxturna (voretigene neparvovec-rzyl, Spark Therapeutics), Kymriah (tisagenlecleucel,…