Urinary Arsenic Profile Affects the Risk of Urothelial Carcinoma even at Low Arsenic Exposure

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TMUIR > College of Medicine > Department of Medicine > Department of Public Health > Periodical Article > Item 987654321/659

Please use this identifier to cite or link to this item: http://libir.tmu.edu.tw/handle/987654321/659

Title:	Urinary Arsenic Profile Affects the Risk of Urothelial Carcinoma even at Low Arsenic Exposure
Authors:	薛玉梅 Pu YS;Yang SM;Huang YK;Chung CJ.;Huang Steven K;Chiu Allen WH;Yang MH;Chen CJ;Hsueh YM
Contributors:	公共衛生學科
Date:	2007
Issue Date:	2009-08-13 13:04:08 (UTC+8)
Abstract:	Arsenic exposure is associated with an increased risk of urothelial carcinoma (UC). To explore the association between individual risk and urinary arsenic profile in subjects without evident exposure, 177 UC cases and 313 age-matched controls were recruited between September 2002 and May 2004 for a case-control study. Urinary arsenic species including the following three categories, inorganic arsenic (As(III)+As(V)), monomethylarsonic acid (MMA(V)) and dimethylarsinic acid (DMA(V)), were determined with high-performance liquid chromatography-linked hydride generator and atomic absorption spectrometry. Arsenic methylation profile was assessed by percentages of various arsenic species in the sum of the three categories measured. The primary methylation index (PMI) was defined as the ratio between MMA(V) and inorganic arsenic. Secondary methylation index (SMI) was determined as the ratio between DMA(V) and MMA(V). Smoking is associated with a significant risk of UC in a dose-dependent manner. After multivariate adjustment, UC cases had a significantly higher sum of all the urinary species measured, higher percent MMA(V), lower percent DMA(V), higher PMI and lower SMI values compared with controls. Smoking interacts with the urinary arsenic profile in modifying the UC risk. Differential carcinogenic effects of the urinary arsenic profile, however, were seen more prominently in non-smokers than in smokers, suggesting that smoking is not the only major environmental source of arsenic contamination since the UC risk differs in non-smokers. Subjects who have an unfavorable urinary arsenic profile have an increased UC risk even at low exposure levels.
Relation:	Toxicol Appl Pharmacol.(218):99-106.
Data Type:	article
Appears in Collections:	[Department of Public Health] Periodical Article

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