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Addressing Immunotoxicities to AAV Gene Therapy for DMD and Other Disorders

Adeno associated virus (AAV) gene therapies provide transformative and often lifesaving treatments for otherwise intractable disorders. As such, they are becoming a new treatment paradigm with FDA approvals increasing and scores of new AAV-based therapies rapidly being developed. For decades, AAV viral vectors have been known to elicit efficacy limiting innate immune responses. Nevertheless, their clinical safety record remained impressive at relatively low doses. More recently however, doses have risen dramatically to achieve therapeutic benefit after systemic administration. Most prevalently alongside high-dose systemic administration, serious and sometimes fatal immunotoxicities have emerged as models to predict and adjust for them have failed. With the recent FDA approval of Elevidys to treat Duchenne muscular dystrophy, and its likely to be expanded label, the largest patient population ever will soon receive AAV. To predict and address AAV immunotoxicities, we have innovated a highly sensitive novel assay measuring innate immune signals associated with key unsafe responses to AAV genomes. Here, we propose to 1) establish the power of our assay to predict immunotoxicities in patients administered AAV at Stanford, 2) to build out our assay’s optionality for multifaceted interrogation of licensed products, and 3) to use our assay to immunologically de-risk candidate AAV split intein dystrophin sequences that may surpass the therapeutic benefit of Elevidys.
Digital Object Identifier (DOI)
Grantee: Bradley Hamilton, PhD
Grant type: Development Grant
Award total: $210,000.00
Institution: Stanford University School of Medicine
Country: USA