Why certain high-concern leachables require compound-specific safety evaluation rather than generic thresholds, and how screening supports expert toxicological review.
Not every leachable can be evaluated using a generic safety threshold. Some compounds belong to higher-concern categories for which compound-specific safety evaluation is more appropriate.
Why high-concern compounds need a different approach
A generic threshold is intended for substances that fall within the assumptions underlying that threshold. A compound with a known high-concern structural or toxicological profile can fall outside those assumptions and require a specific limit or dedicated assessment.
Screening is not the final classification
Structure-based or database-based screening can flag compounds for additional review. Such alerts should be treated as a triage mechanism. Final classification requires expert review of identity, existing toxicological data, exposure, mechanism and applicable regulatory criteria.
Connection with ICH M7
DNA-reactive mutagenic concerns require specific treatment under the ICH M7 framework. This can affect which safety limit is appropriate for a leachable and whether a generic E&L threshold can be applied.
Compound-specific limits
Where a reliable health-based exposure limit or other compound-specific safety limit exists, that information can take precedence over a generic threshold, depending on the classification and exposure context.
Frequently asked questions
What is a cohort of concern in E&L assessment?
It refers to substances or structural categories that warrant heightened safety attention and may not be adequately addressed by a generic threshold.
Is a structural alert enough to classify a compound?
No. Screening alerts require expert review and integration with other evidence.
Why might a generic SCT not apply?
Because some high-concern compounds require a compound-specific safety limit.
How does ICH M7 relate to leachables?
If a leachable presents a DNA-reactive mutagenic concern, the ICH M7 framework becomes relevant to safety assessment.
Can an existing PDE be used for a leachable?
Potentially, if the value is authoritative, applicable to the route and exposure scenario, and scientifically appropriate for the compound.
