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Decreased Bladder Cancer Growth in Parous Mice

Objectives To investigate the association between parity and exophytic bladder cancer growth in the UPII-SV40T transgenic mouse model of bladder cancer. Methods The UPII-SV40T transgenic mice express the simian virus 40 large T antigen specifically in the urothelium (driven by uroplakin II promoter)...

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Published in:Urology (Ridgewood, N.J.) N.J.), 2008-09, Vol.72 (3), p.470-473
Main Authors: Johnson, Aimee M, O'Connell, Mary J, Messing, Edward M, Reeder, Jay E
Format: Article
Language:English
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Summary:Objectives To investigate the association between parity and exophytic bladder cancer growth in the UPII-SV40T transgenic mouse model of bladder cancer. Methods The UPII-SV40T transgenic mice express the simian virus 40 large T antigen specifically in the urothelium (driven by uroplakin II promoter) and reliably develop bladder cancer. UPII-SV40T transgenic female mice were either never bred (nulliparous; n = 6) or placed in breeding pairs and allowed full-term pregnancies and lactation. Multiparous animals (n = 5) had between 2 and 4 litters. UPII-SV40T transgenic male mice were sham-operated (intact; n = 9) or castrated (n = 8) at 24 weeks of age. Noninvasive, contrast-enhanced, flat panel detector-based, cone beam computed tomographic imaging of animals at 32 weeks of age permitted quantification of bladder cancer volumes. Results Multiparous animals had significantly smaller bladder cancers than their nulliparous female ( P < .001) and intact male ( P = .007) counterparts but not different from castrated males. Bladder cancer volume in nulliparous females was significantly larger than castrated males ( P < .001) but not different from intact males. Conclusions These results suggest that pregnancy, parity, lactation, or a combination of these may play a protective role in bladder cancer by inhibiting tumor growth. This could be an important model system for studying the effects of pregnancy/lactation hormones on bladder cancer, which could lead to identification of additional risk factors of bladder cancer.
ISSN:0090-4295
1527-9995
DOI:10.1016/j.urology.2008.04.028