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The classification of skin irritants by human patch test
D A Basketter1, M Chamberlain, H A Griffiths
1Unilever Environmental Safety Laboratory, Sharnbrook, Bedford, UK.
Summary
The human 4-hour patch test effectively identifies skin irritants ethically, without animal testing. This method provides reliable data for regulatory classification of skin irritancy.
Area of Science:
- Dermatology
- Toxicology
- In vitro testing
Background:
- Animal testing for skin irritation is ethically concerning.
- The human 4-hour patch test was developed as an alternative.
- The protocol aims to elicit only mild irritant reactions.
Purpose of the Study:
- To evaluate the human 4-hour patch test for identifying skin irritants.
- To discuss its performance based on recent investigations.
- To provide recommendations for its conduct and interpretation.
Main Methods:
- Utilized the human 4-hour patch test protocol.
- Reviewed intra- and inter-laboratory investigation data.
- Assessed performance for regulatory classification.
Main Results:
- The test demonstrates potential for identifying skin irritants.
- It provides 'gold standard' data for regulatory classification.
- Recommendations for test conduct and interpretation are proposed.
Conclusions:
- The human 4-hour patch test is a valuable, ethical tool for assessing skin irritation.
- It offers reliable data for European regulatory classification.
- Formal validation of this assay is deemed unnecessary.