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Appendix D - Dossier (PDF) - Tera

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date: 20–JUL–2005<br />

5. Toxicity Substance ID: 71–43–2<br />

______________________________________________________________________________<br />

Type: other: DNA adducts<br />

System of testing: In vitro in DNA and cell Culture and in vivo<br />

Concentration: varied<br />

Metabolic activation: without<br />

Method: other: nonguideline<br />

Year: 1994<br />

GLP: no data<br />

Test substance: other TS: as prescribed by 1.1–1.4 and metabolites<br />

Remark: The metabolites of benzene; hydroquinone, benzoquinone and<br />

trans,trans–muconaldehyde produce several adducts when<br />

reacted with DNA as detected by the 32P–postlabelling assay.<br />

Treatment of rats with benzene resulted in a dose related<br />

increase of a single DNA adduct in several organs including<br />

the liver. However, in another study in which rats were<br />

treated with 200–500 mg/kg for up to 10 weeks, DNA adducts<br />

were not consistently detected in several organs.<br />

Preliminary results from a recent study suggest that phenol<br />

or hydroquinone at a dose level of 50–100 mg/kg can cause<br />

DNA adducts in the bone marrow of rats detectable by the<br />

32P–postlabelling method.<br />

Source: Deutsche Shell Chemie GmbH Eschborn<br />

06–JAN–1997 (1282)<br />

Type: Sister chromatid exchange assay<br />

System of testing: Chinese hamster ovary cells with and without rat liver<br />

metabolic activation<br />

Concentration: 750 ug/ml<br />

Metabolic activation: with and without<br />

Result: positive<br />

Method: OECD Guide–line 479<br />

Year: 1986<br />

GLP: yes<br />

Test substance: as prescribed by 1.1 – 1.4<br />

Remark: Four widely used in vitro assays for genetic toxicity were<br />

evaluated fro their ability to predict the carcinogenicity<br />

of selected chemicals in rodents. These assays were<br />

mutagenesis in Salmonella and mouse lymphoma cells and<br />

chromosome aberrations and sister chromatid exchanges in<br />

Chinese hamster ovary cells. Test results from the four in<br />

vitro assays did not show significant differences in<br />

individual concordance with the rodent carcinogenicity<br />

results; the concordance of each assay was approximately 60<br />

percent. There was no evidence of complementarity among<br />

thefour assays, and no battery of tests constructed from<br />

these assays improved substantially on the overall<br />

performance of the Salmonella assay. The in vitro assays<br />

which representeda range of three cell types and four end<br />

points did show substantial agreement among themselves,<br />

indicating that chemicals positive in one in vitro assay<br />

tended to be positive in the other in vitro assays.<br />

However, benzene waspositive only in the SCE assay without<br />

metabolic activation.<br />

Source: Deutsche Shell Chemie GmbH Eschborn<br />

<strong>Appendix</strong> D: Benzene SIDS <strong>Dossier</strong><br />

– 435/957 –

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