National Toxicology Program

National Toxicology Program
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Abstract for TR-114 - 2,3,5,6-Tetrachloro-4-nitroanisole (CASRN 2438-88-2)

Bioassay of 2,3,5,6-Tetrachloro-4-nitroanisole for Possible Carcinogenicity (CAS No. 2438-88-2)

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Chemical Formula:  C7H3Cl4NO3

2,3,5,6-Tetrachloro-4-nitroanisole, an agricultural fungicide and acaricide, was selected for bioassay by the National Cancer Institute because of its structural similarity to pentachloronitrobenzene, a pesticide classified as tumorigenic by the Secretary's Commission on Pesticides and their Relationship to Environmental Health.

A bioassay for possible carcinogenicity of 2,4,5,6-tetrachloro-4-nitroanisole was conducted using Fischer 344 rats and B6C3F1 mice. 2,3,5,6-Tetrachloro-4-nitroanisole was administered in the feed, at either of two concentrations, to groups of male and female animals of each species. The high and low dietary concentrations used in the chronic bioassay were 0.012 and 0.006 percent, respectively, for both species. After a 104-week period of chemical administration, observation of rats continued for up to 3 weeks and observation of mice continued for up to 1 week. For rats 50 animals of each sex were placed on test as controls, while for mice 55 animals of each sex were placed on test as controls.

There were no significant positive associations between the dietary concentration of 2,3,5,6-tetrachloro-4-nitroanisole administered and mortality in rats or mice of either sex. Adequate numbers of animals in all groups survived sufficiently long to be at risk from late-developing tumors.

No neoplasms, except for interstitial-cell testicular tumors in males, occurred at statistically significant incidences

 

Levels of Evidence of Carcinogenicity:
Sex Species Results
Male Rats: Negative
Female Rats: Negative
Male Mice: Negative
Female Mice: Negative

Synonyms: 1-methoxy-4-nitro-2,3,5,6-tetrachlorobenzene; tetrachloronitroanisole; ENT 33225; TCNA


Report Date: 1978

Target Organs from 2-year Studies


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