Abstract
Purpose
Chronic arsenic exposure at levels found in US drinking water has been associated with bladder cancer. While arsenic is a known carcinogen, recent studies suggest that it is useful as a therapeutic agent for leukemia. This study examined the relationship between arsenic exposure and bladder cancer mortality.
Methods
We studied 832 cases of bladder cancer diagnosed in New Hampshire from a population-based case–control study. Individual exposure to arsenic was determined in home drinking water using ICP-MS and in toenail samples by instrumental neutron activation analysis.
Results
Among the high arsenic exposure group, found using toenail arsenic level or arsenic consumption, cases experienced a de-escalated survival hazard ratio (HR) [high (≥75 percent) versus low (<25th percentile) toenail arsenic overall survival HR 0.5 (95% CI 0.4–0.8)], controlled for tumor stage, grade, gender, age and treatment regimen. This association was found largely among invasive tumors, in smokers and was not modified by TP53 status. Bladder cancer cause-specific survival showed a similar trend, but did not reach statistical significance [HR 0.5 (95% CI 0.3–1.1)].
Conclusions
Arsenic exposure may be related to the survival of patients with bladder cancer.
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Acknowledgments
Funding for the study was provided by the National Institutes of Health (NIH): K07 CA102327, R03 CA121382, R03 CA99500, R01 CA57494 (NCI) and P20 RR018787 [National Center for Research Resources (NCRR) IDeA program], P42 ES07373 [National Institute for Environmental Health Sciences (NIEHS) and the Dartmouth Superfund Basic Research Program]. Its contents are solely the responsibility of the authors and do not necessarily represent the official views of the NIH.
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Kwong, R.C., Karagas, M.R., Kelsey, K.T. et al. Arsenic exposure predicts bladder cancer survival in a US population. World J Urol 28, 487–492 (2010). https://doi.org/10.1007/s00345-009-0477-y
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DOI: https://doi.org/10.1007/s00345-009-0477-y