it has become increasingly clear that the first generation of AAV vectors is less than optimal since in most, if not all, cases, exceedingly high doses are needed to achieve clinical efficacy
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first-generation AAV vectors
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First-generation AAV vectors are less than optimal because exceedingly high doses are needed to achieve clinical efficacy in most if not all cases.
At least 21 patients have died in the context described for first-generation AAV vector use.
Use of first-generation AAV vectors at high doses has been associated with serious adverse events in some patients.