Radiolabeled Mass Balance Study Comments

Pharmaron says it welcomes an FDA draft guidance on clinical pharmacology considerations for human radiolabeled mass balance studies because it clarifies several topics related to the design, execution, and sample analysis for a human mass balance study that were not previously outlined in this way. The comment also has specific questions and items needing clarification.

The Bayer comment letter says it would be beneficial to have examples for certain cases including the selection of subjects when polymorphism is known, or time-dependent pharmacokinetics.

Merck’s comment lists specific areas of the draft for which the company requests verification.

Vertex submitted three questions tied to specific lines in the draft.

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