Gene Therapies: US FDA Clarity Needed On ‘Sameness’ Determinations For Products From Same Vector Class
Agency also should better define, and provide examples of, the types of minor differences and additional features that would affect orphan drug designation and exclusivity determinations, industry sponsors say in comments on January draft guidance.
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For two gene therapies with the same transgenes and/or vectors but different promoters, the US FDA’s ‘sameness’ determination under the orphan drug regulations will consider whether that difference has any impact on product activity, the agency's Wilson Bryan says.
US FDA draft guidance says that ‘minor differences’ in transgenes and/or vectors won’t be enough for orphan exclusivity, but agency will consider ‘additional features of the final product’ in making the determination.
Agency re-evaluating criteria for certain human cells, tissues and cellular and tissue-based products (HCT/Ps) that are not ideally regulated as BLAs; industry suggests a 2014 guidance which created an alternative pathway for cord blood products could serve as potential template.