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Annals of Occupational Hygiene Advance Access published online on November 28, 2006
Annals of Occupational Hygiene, doi:10.1093/annhyg/mel076
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© The Author 2006. Published by Oxford University Press on behalf of the British Occupational Hygiene Society
Received July 3, 2006
Accepted October 18, 2006

Article

Aniline--A ‘Historical’ Contact Allergen? Current Data from the IVDK and Review of the Literature

Wolfgang Uter 1 *, Gisela Stropp 2, Axel Schnuch 3, and Holger Lessmann 3

1 Department of Medical Informatics, Biometry and Epidemiology, Friedrich-Alexander University Erlangen-Nürnberg, Erlangen, Germany
2 Bayer HealthCare AG, Toxicology, Wuppertal, Germany
3 Information Network of Departments of Dermatology (IVDK) at the Georg August University, Göttingen, Germany

* To whom correspondence should be addressed.
Wolfgang Uter, E-mail: wolfgang.uter{at}rzmail.uni-erlangen.de


  Abstract

Objectives: To assess whether aniline should be regarded as potential cause of contact allergy (CA). Methods: Retrospective analysis of clinical data collected in a CA surveillance network (IVDK, www.ivdk.org) between 01/1992 and 06/2004 and review of pertinent literature. Results: In the above period, 25 of the 1119 patients patch tested with aniline had positive (allergic) reactions; in 24 of these 25 patients, CA to p-phenylenediamine, p-aminoazobenzene or (in one case) another para-amino compound was additionally diagnosed. Exposure to aniline could not be ascertained in any of the cases, based on the available data. Discussion: Previous clinical results, which have been summarized and tabulated, are partly difficult to evaluate, as they may lack detail, or test concentrations are higher than those currently recommended, possibly yielding false-positive reactions. In none of the studies had previous exposures to aniline been unequivocally identified. Conclusion: Based on clinical data it is unlikely that aniline is an independent sensitizer of current importance. However, it may elicit allergic reactions in subjects pre-sensitized to para-substituted amino compounds. In summary, supported by recent experimental evidence employing the local lymph node assay as a validated animal test system, it appears probable that aniline is a weak allergen.


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