Environment and Breast Cancer: Science Review


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nitromethane
CAS RN 75-52-5



Cancer studies: Mammary gland tumors
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Originating list
The list(s) or database(s) in which the chemical was identified as showing an increase in mammary gland tumors. CPDB: Carcinogenic Potency Database, IARC: International Agency for Research on Chemicals Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man summaries, NTP TR: National Toxicology Program (NTP) Technical Reports, NTP 11ROC: NTP 11th Report on Carcinogens, CCRIS: Chemical Carcinogenesis Research Information Service.
Carcinogenicity Potency Database, IARC Monographs, National Toxicology Program studies, Chemical Carcinogenesis Research Information System
Mammary gland tumor summary
A summary of findings related to mammary gland tumors, most often excerpted from IARC Monographs or the NTP 11th ROC, and, in some cases, supplemented by our evaluation of individual studies and reviews, is available for the priority chemicals and 67 others.
NTP 11th ROC: In rats, nitromethane caused mammary gland tumors in female F344/N rats but did not cause any increased tumors in Long-Evans rats (exposed to lower levels).
Citations to review sources and individual studies reporting mammary gland tumors are listed below.
Citation
Source Type
Notes
International Agency for Research on Cancer, Monographs on the evaluation of carcinogenic risk of chemicals to man.VOL.: 77 (2000) (p. 487) Nitromethane.
Review
In one experiment in rats, nitromethane increased the incidence of benign and malignant mammary gland tumors in females: NTP TR461, 1997.
Carcinogenic Potency Database 2005. Gold LS ST, Manley NB, Garfinkel GB, Ames BN. Summary Table by Chemical of Carcinogenicity Results in CPDB on 1485 Chemicals. 2005
Review
One of 2 studies reported mammary tumors: NTP TR461. Griffin 1996 did not report mammary tumors.
National Toxicology Program 11th Report on Carcinogens. Nitromethane
Review
When administered by inhalation, caused mammary-gland tumors in female F344/N rats but did not cause increased tumors in Long-Evans rats (exposed to lower levels) (NTP 1997).
Griffin TB, Coulston F, Stein AA. Chronic inhalation exposure of rats to nitromethane. Ecotoxicol Environ Saf 1996;34(2):109-17.
Primary Literature
A study listed in the CPDB 2005 that did not report mammary tumors.
National Toxicology Program Technical Report 461, 1997
Primary Literature

experimental details
Increases in benign and malignant mammary tumors in female rats. 0, 94, 188, 375 ppm for 6 hrs/d, 5 d/wk for 103 wks for rats. 0, 188, 375, 750 ppm for 6 hrs/d, 5 d/wk for 103 wks for mice. Female rats: 19/50, 21/50, 33/50, 36/50 fibroadenoma Female rats: 2/50, 0/50, 0/50, 2/50 adenoma Female rats: 2/50, 7/50, 1/50, 11/50 carcinoma