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Carcinogenesis Advance Access originally published online on October 7, 2004
Carcinogenesis 2005 26(5):875-882; doi:10.1093/carcin/bgh299
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Carcinogenesis vol.26 no.5 © Oxford University Press 2004; all rights reserved.

COMMENTARY

Pas1 haplotype-dependent genetic predisposition to lung tumorigenesis in rodents: a meta-analysis

Received July 30, 2004; revised and accepted September 27, 2004

Giacomo Manenti and Tommaso A. Dragani *

Department of Experimental Oncology and laboratories, Istituto Nazionale Tumori, Milan, Italy

* To whom correspondence should be addressed at: Istituto Nazionale Tumori, Via G. Venezian 1, 20133 Milan, Italy. Tel.: +39 0223 902642; Fax: +39 0223 903237; Email: dragani{at}istitutotumori.mi.it

Rodent species and strains show wide variations in susceptibility to lung tumorigenesis. In mice, hierarchical clustering of 29 inbred laboratory strains by pulmonary adenoma susceptibility 1 (Pas1) locus polymorphisms separated the strains into either an A/J- or a C57BL/6J-type Pas1 haplotype. A pooled analysis (including >8500 mice) of studies on spontaneous and chemically induced lung tumorigenesis in these strains revealed a significantly higher risk of spontaneous lung tumors [odds ratio (OR) 12.17; 95% confidence interval (CI) 9.00–16.45] as well as of chemically induced lung tumors (OR 15.14; 95% CI 12.51–18.31) in the A/J-type haplotype. Strain differences were observed with six different carcinogens, suggesting that Pas1 locus activity is carcinogen-independent. Thus, the present meta-analysis indicates a link between the genetic control of spontaneous and chemically induced lung tumor susceptibility in mice. The Pas1 susceptibility allele is frequent in the population of inbred mouse strains, whereas a counterpart appears to be absent or rare in rat and hamster strains. These findings might help in the interpretation of results of rodent carcinogenicity bioassays and assessing the risk of lung carcinogenesis from chemicals.


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