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There may be reasons to deviate from the TTC value based on the profile of genotoxicity results. Positive result from in vitro studies only may allow to exempt an impurity from limitation at TTC level if lack of in vivo relevance of the findings is convincingly demonstrated based on a weight-of evidence approach (see ICH S2 guidelines). This approach will usually need negative results with the impurity from some additional in vitro and/or appropriate in vivo testing. |
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