Abstract
The Episkin® model took part in the prevalidation study on in vitro tests for acute skin irritation of chemicals, which was carried out during 1999 and 2000. This prevalidation study was co-ordinated and supported by the European Centre for the Validation of Alternative Methods (ECVAM). During Phase 1 and Phase 2 of this study, reproducibility and transferability of the method were verified. Unfortunately, the performance of the method in terms of predictive ability was considered insufficient, due to a low specificity. In order to improve the performance of the Episkin® method, the existing protocol was refined. This refinement consisted in reducing the exposure time of epidermis with chemicals. Sensitivity, specificity and accuracy of the new method were 70, 80 and 75%, respectively, thus meeting the acceptance criteria as defined by the Management Team. The Episkin® method is now ready to enter a validation study of in vitro tests for acute skin irritation.
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