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Lung Cancer and Arsenic Concentrations in Drinking Water in Chile

Ferreccio, Catterina1 2; González, Claudia2; Milosavjlevic, Vivian2; Marshall, Guillermo1; Sancha, Ana Maria3; Smith, Allan H.4

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From the 1Facultad de Matemáticas and 3Facultad de Ciencias Físicas y Matemáticas, Pontificia Universidad Católica de Chile, Santiago, Chile; 2Grupo Para el Desarrollo de la Investigación en Salud (GREDIS, Santiago, Chile); and 4School of Public Health, University of California, Berkeley, CA.

Submitted June 21, 1999; final version accepted April 18, 2000.

Address correspondence to: Catterina Ferreccio, 1711 Massachusetts Avenue NW Apartment 628, Washington DC 20036.

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Cities in northern Chile had arsenic concentrations of 860 μg/liter in drinking water in the period 1958–1970. Concentrations have since been reduced to 40 μg/liter. We investigated the relation between lung cancer and arsenic in drinking water in northern Chile in a case-control study involving patients diagnosed with lung cancer between 1994 and 1996 and frequency-matched hospital controls. The study identified 152 lung cancer cases and 419 controls. Participants were interviewed regarding drinking water sources, cigarette smoking, and other variables. Logistic regression analysis revealed a clear trend in lung cancer odds ratios and 95% confidence intervals (CIs) with increasing concentration of arsenic in drinking water, as follows: 1, 1.6 (95% CI = 0.5–5.3), 3.9 (95% CI = 1.2–12.3), 5.2 (95% CI = 2.3–11.7), and 8.9 (95% CI = 4.0–19.6), for arsenic concentrations ranging from less than 10 μg/liter to a 65-year average concentration of 200–400 μg/liter. There was evidence of synergy between cigarette smoking and ingestion of arsenic in drinking water; the odds ratio for lung cancer was 32.0 (95% CI = 7.2–198.0) among smokers exposed to more than 200 μg/liter of arsenic in drinking water (lifetime average) compared with nonsmokers exposed to less than 50 μg/liter. This study provides strong evidence that ingestion of inorganic arsenic is associated with human lung cancer.

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Humans are exposed to organic and inorganic arsenic through environmental and occupational sources. Lung cancer is known to be caused by occupational exposure to arsenic via inhalation. 1 The main occupational exposures occur in workers who are engaged in smelting and refining copper, gold, and lead ores; in producing agricultural pesticides; in using arsenic as pigments and dyes; and in manufacturing glass, semiconductors, and various pharmaceutical substances from which there may be high exposure to airborne arsenic. 1 The most extensive human exposure to inorganic arsenic, however, results from naturally occurring inorganic arsenic in drinking water, long known to be a cause of skin cancer. Surprising evidence, originating from studies in Taiwan, indicated that the ingestion of inorganic arsenic also increases mortality from cancer originating in various internal sites, including lung. 2–9 Further evidence of a link between the ingestion of inorganic arsenic and increased lung cancer risks was found in a small cohort study in Japan involving residents using well water contaminated with inorganic arsenic 10 and in large population studies in Cordoba, Argentina, 11 and northern Chile. 12,13 The purpose of the present study was to investigate inorganic arsenic and lung cancer in northern Chile in a case-control study, with individual assessment of exposure based on arsenic concentrations in water sources piped to households. It is the first large, population-based lung cancer case-control study concerning arsenic in drinking water. A preliminary research report of work in progress on this study was presented at a scientific meeting in Brazil 14 and included some of the results we present more fully in this paper.

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Subjects and Methods

The study area included regions I, II, and III in northern Chile. Details on the study area and methods are described more fully elsewhere. 14 Briefly, the population in region II experienced high exposure to inorganic arsenic in past years from natural contamination of drinking water originating in the Andes mountains, whereas water sources in regions I and III contained relatively little arsenic (Table 1).

Table 1
Table 1
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Identification of Lung Cancer Cases

Nurses were recruited for the study and trained in interviewing techniques in each major city of northern Chile: Arica and Iquique in region I; Antofagasta in region II, and Copiapó in region III. They identified lung cancer and bladder cancer cases in the public hospitals, where the large majority (80–90%) of cancer patients are admitted. In this paper we report the results for the lung cancer cases only. Eligible cases were all those admitted to public hospitals with lung cancer in the study region between November 1994 and July 1996, in whom lung cancer was pathologically confirmed and first diagnosis was either during the current hospital admission or no more than 1 year before the current admission. There were two public hospitals in region I, three public hospitals in region II, and three public hospitals in region III. Most cancer patients, however, were referred from the smaller public hospitals to the main public hospitals of Antofagasta, Iquique, Arica, and Copiapó. The interviewers went daily to the admissions department and the pathology laboratories of these main hospitals to identify patients diagnosed with lung cancer. The smaller public hospitals were visited approximately once a month. The majority of patients, about 70%, were interviewed while still in the hospital. The remaining 30% were visited and interviewed in their homes after discharge.

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Selection of Controls

The methods we used for selection of controls for this study were complicated and unusual for several reasons. We used hospital controls because selection of a random sample representative of the general population would have been prohibitively expensive. Selection of random samples from the general population is difficult in itself in Chile, and locating selected participants would be expensive in the study area, which includes scattered small populations in remote areas. Using hospital controls meant that most controls could be identified and interviewed in the few major hospitals in the study area. Only 20% of controls had to be interviewed in their homes after discharge.

To avoid the problem of matching on exposure instead of matching on hospital, we defined all patients admitted to any public hospital in the whole study area as eligible controls. We identified the number of patients admitted to each hospital in 1991 and created a frequency distribution of admissions by hospital. Our goal was to obtain the same frequency distribution in our control group. We created an ordered listing for control selection with each hospital repeated on the list the number of times required to create the target frequency distribution.

For each index case with lung cancer, we selected two controls. The hospital to be the source for each control was identified as above. The first control was randomly selected from among patients who were admitted to the chosen hospital with a cancer not known or suspected to be related to arsenic, within a month of the admission of the index case to their hospital, and who were within 4 years of age of the index case. We excluded as controls patients admitted with cancer of the liver, skin, kidney, bladder, or prostate, as each site has been found to be related to arsenic in some studies.

We selected a second control group in the same manner as the cancer control group but from among patients admitted to the next hospital on the list with a diagnosis other than cancer and also excluding from consideration those admitted with cardiovascular, skin, or neurologic diseases. 15 These diseases were excluded because of evidence that arsenic may increase the risks of some conditions within each of these disease groups.

At the same time, we also selected controls for a concurrent bladder cancer study in a manner identical to that described for the lung cancer cases. We pooled these controls with those selected for the lung cancer cases to increase the study power.

In view of the complexity of control group selection, we made several validity checks, as follows. (1) We compared key results for the cancer and noncancer control groups separately before pooling. (2) We compared key results for the combined control group with those selected for the lung cancer patients alone before combining the two control groups. (3) We compared the achieved hospital distribution of the controls with the target distribution. (4) We compared the actual distribution of the controls by county of residence at the time of diagnosis with that which would be predicted for a random sample from the general population based on the 1992 census given the age distribution of the controls. Regions I, II, and III have ten, nine, and nine counties within them, respectively. (5) We also used this predicted county distribution for the controls in the final validity check on the basis of the critical criterion that the exposure of controls should be representative of the exposure of the source population in which cases occurred. We grouped counties in the study area into five exposure levels on the basis of average arsenic concentrations in water supplies during the period 1958–1970. We then compared the control group distribution in these counties at the time of the study with that expected for a random population sample based on the 1992 census. In this way, we could examine indirectly the representativeness of the control group, with regard to general population exposure to arsenic in water, to investigate potential bias created by the complex control group selection methods used in this study.

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Participant Interviews

The nurse interviewer read a letter of consent to all study subjects, explaining the method of the study and the general aim. The nurse then administered a structured questionnaire, including information related to socioeconomic status (SES), lifetime residential history, occupation, and smoking. The focus in the occupational interview was to identify work with potential arsenic exposure in copper smelting.

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Exposure Assessment

Almost 100% of urban households are served by city water systems, and the large majority of the population in this desert region receives water from town or city supplies. In the 1992 census, the population coverage by public water systems in the main cities was as follows: region 1, Arica 92% and Iquique 94%; region 2, Antofagasta 90% and Calama 93%; and region 3, Copiapó 86% and Vallenar 84%. These cities represent 88%, 83%, and 59% of the households in the respective regions. The coverage is lower in the small towns of each region: region 1, 64–80%; region 2, 76–89%; and region 3, 67–91%. Since 1950, water companies have been required to carry out detailed chemical tests of the water, including measuring arsenic levels, at least once a year. We collected data on arsenic concentrations from 1950 through 1994. Table 1 presents average arsenic concentration in drinking water from 1930 through 1994 for the study area in northern Chile including regions I, II, and III. Water arsenic concentrations have been rounded, taking into account knowledge concerning when changes in water sources occurred. Concentrations in earlier years, 1930–1957, were estimated on the basis of measurements in the 1950s. Using lifetime residential histories, we assigned to each participant the average water arsenic concentration for the county in which he or she resided for each year. We calculated average arsenic water concentrations from 1930 to the present. In addition, we calculated the average arsenic water concentrations for the counties of residence for 1958–1970, when some of the highest exposures occurred.

The population-weighted average arsenic concentration for region II in these years was 578 μg/liter, much higher than the population-weighted average of 212 μg/liter for the second highest concentration period, which was from 1971 through 1977.

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Statistical Methods

We evaluated lifetime (1930 to the present) average arsenic exposure as a categorical variable with five exposure strata. We also examined peak exposures on the basis of the average water concentration for each participant in 1958–1970, stratified into seven categories. We used the lowest exposure categories as reference to calculate odds ratios (ORs). We conducted unconditional regression analyses using StataCorp statistical software (release 4.0, 1995; College Station, TX) adjusting for age, sex, SES, smoking, and working in a copper smelter. Age was treated as both a continuous and a categorical variable. The results were similar, and we have presented the findings using categorical variables for six age strata. We included smoking as a continuous variable (average packs of cigarettes smoked per year) in logistic regression analyses and assessed synergy in a stratified analysis of smokers and nonsmokers (ever/never smoked at least 100 cigarettes total in lifetime). We estimated an SES score that took into account monthly income, years of school, occupation, and house commodities. We entered SES as a continuous variable and also stratified SES into three levels: low, medium, and high. We reviewed occupational histories for copper smelting or refining as potential exposure to inhaled arsenic. We included an indicator variable for this exposure in the logistic regression analyses and also the number of years worked in this occupation. We first conducted analyses with cancer and noncancer controls separately. We conducted the main analyses using an overall combined control group, including cancer and noncancer controls, and also the controls selected for the bladder cancer patients in a concurrent case-control study with identical control selection methods. We examined synergy between arsenic and smoking in stratified analyses involving never-smokers and ever-smokers analyzed separately.

We conducted unconditional logistic regression analyses that included the matching variables sex and age as indicator variables, with one for sex and six for age strata.

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Participation of Lung Cancer Cases

During the 20 months of enrollment, 217 subjects were newly diagnosed with lung cancer in the hospital. Of these subjects, 151 (70%) agreed to participate and were interviewed. There were few refusals among cases and controls (less than 5%). The main reasons for nonparticipation were that the patient was not at the hospital when we attempted to contact him or her, the patient had moved from home and could not be located, and the patient was too sick to complete the questionnaire.

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Validation of Control Group

We included a total of 419 controls into the analysis phase of the study, 167 cancer controls and 252 noncancer controls. There were fewer cancer controls because of difficulties finding sufficient subjects meeting age- and sex-matching criteria, particularly among men. A series of validation checks was undertaken for the controls. We compared the achieved control group distribution between hospitals with the target distribution based on admissions in 1991 (Table 2). We found major discrepancies. The main differences between the observed and expected control distributions resulted from the main hospitals of Arica and Antofagasta. The former provided fewer controls and the latter provided more controls than expected. One explanation for these differences may be variation in the capability of the field workers to recruit study subjects. In Antofagasta we had hired two field workers, which may explain the increased recruitment of controls. Because of the discrepancy, we investigated various parameters relating to control group validity.

Table 2
Table 2
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Table 3 presents some basic information for cases and controls and compares characteristics and exposures of the total combined control group with those of the cancer and noncancer controls, those controls directly selected for lung cancer patients, and those selected for the bladder cancer cases. The combined control group had been exposed to an average arsenic concentration of 109 μg/liter in drinking water between 1930 and 1994 and an average of 280 μg/liter for the peak exposure period 1958–1970. Because the differences in exposure for the various control sources were small, we present results from major analyses using the overall combined control group.

Table 3
Table 3
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The overall criterion for assessing control group validity in a case-control study is that the control group should provide an unbiased estimate of the exposure distribution of the general population in which the cases occurred. This distribution was assessed indirectly using the 1992 census. Table 4 presents the results based on water arsenic concentration in the period 1958–1970 that are already presented in Table 1. Population numbers in 1992 were used to estimate an expected distribution for 419 randomly selected controls (column 3 of Table 4). This distribution was then compared with the actual distribution of the selected controls (column 4). The final column shows the ratio of the selected numbers of controls to that expected. The baseline exposure category (0–49 μg/liter) is reasonably represented (selected controls to expected ratio of 0.8). The high exposure category is overrepresented, however, owing to overselection of controls from Antofagasta (Table 2), the only location with water concentration above 400 μg/liter in the period 1958–1970 (Table 1). The impact of this bias would be to underestimate ORs for the highest arsenic exposure. The next-to-highest arsenic exposure category, 100–300 μg/liter, however, appears to be markedly underrepresented, which would lead to overestimation of ORs. This assessment is indirect. In data analysis, the actual residential location of cases and controls was used throughout to determine arsenic water concentrations, rather than just residential location at the time of the study. Nevertheless, the likely direction of bias is apparent, with underestimation of ORs in the highest exposure levels and overestimation of ORs at the lower water concentrations. At relatively low concentrations of 50–99 μg/liter, the ORs may be underestimated. The extent of bias is also dependent on ascertainment of cases. Although case ascertainment was thorough, it is possible that some underascertainment would have occurred in the same cities in which controls were underselected.

Table 4
Table 4
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Table 5 presents findings based on average drinking water concentration from 1930 (or year of birth if the subject was born later) through 1994 using all controls pooled and compares results of analyses conducted with different control groups. The fourth column presents ORs using the pooled controls and adjustment by sex and age, and the fifth column also includes adjustment for smoking, SES, and working in copper smelting. Clear trends in ORs are apparent. The remaining columns of the table show that similar results are obtained if cancer controls are used alone, noncancer controls are used alone, or if the matched controls selected directly for the lung cancer patients are used alone (excluding the additional controls derived from the bladder cancer study).

Table 5
Table 5
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Table 6 presents findings based on the period of peak exposure in Antofagasta, 1958–1970. All controls have been included. A clear trend is again apparent. In the full-model logistic regression analysis, we found an OR of 4.3 [95% confidence interval (CI) = 2.6–7.3] for lung cancer associated with smoking, a 70% increase in relative risk associated with copper smelting, and apparently slightly higher relative risks associated with higher SES.

Table 6
Table 6
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Table 7 presents results for nonsmokers and smokers of cigarettes. Similar results were obtained after adjusting for age and sex. Our findings demonstrate a positive trend in relative risk of lung cancer with exposure to increasing concentration of arsenic in drinking water among nonsmokers as well as a greater-than-additive effect for these exposures combined. The OR for smokers in the highest arsenic-exposure category (32.0) is much greater than that expected (13.1 = 8.0 + 6.1 – 1) on the basis of the OR for nonsmokers in the highest arsenic-exposure category (8.0) and the OR for smokers in the lowest arsenic-exposure category (6.1).

Table 7
Table 7
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Finally, Figure 1 presents the time-window pattern of exposure of cases and controls. Cases had higher exposures than controls, especially in the period 1955–1975. Thus, the markedly increased relative risks of lung cancer found in this study relate to exposures that predominately occurred 20–40 years before cancer diagnosis.

Figure 1
Figure 1
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This is the first study based on a large population exposed to arsenic in drinking water conducted to document the relation between this exposure and lung cancer risks and to evaluate synergy with other exposures. The relative risk estimate among the most highly exposed (OR = 8.9; 95% CI = 4.0–19.6) is consistent with that from a small cohort study in Japan that reported eight cases of lung cancer in people who had been drinking water containing even higher concentrations of inorganic arsenic (more than 1,000 μg/liter, actual level not specified) with 0.51 expected cases (standardized morbidity ratio = 15.7; 95% CI = 7.4–31.0). 10 The relative risk estimates reported here are also consistent with the overall population standardized mortality ratios for lung cancer in region II of Chile of 3.8 for men (95% CI = 3.5–4.1) and 3.1 for women (95% CI = 2.7–3.7) 13 using all of Chile, excluding region II, as the referent population. When coupled with lung cancer findings related to arsenic exposure in Taiwan 2–9 and Argentina, 11 the overall evidence is sufficient to conclude that ingestion of inorganic arsenic increases the risk of lung cancer.

The main weakness of the study concerns control selection. The use of hospital controls with matching by hospital, as is usually done, would have effectively matched on exposure, because arsenic concentrations in water supplies vary by city and geographic location throughout the study area. For example, if an Antofagasta hospital patient were selected as a control for a lung cancer patient also admitted to an Antofagasta hospital, the likelihood is that both patients would have been drinking from the same water supply and would have had similar exposure to the very high arsenic levels in Antofagasta water supplies in past years. It is clear, however, that the control selection criteria were not fully adhered to and that relatively more controls were chosen from the highly exposed city of Antofagasta than from the lower-exposure cities of Arica and Iquique (Table 2). Nevertheless, the direction of this bias is clear in that it would result in underestimation of risks for the highest exposures (Table 4). Thus, the control selection problem does not affect causal inference in that, if anything, correcting for this bias would only add to the evidence of increased lung cancer risks associated with arsenic in drinking water. In addition, evaluation of analyses using various control groups shown in Table 3 shows little difference in effect estimates according to average exposure. This stability in control group exposure, and the contrast with exposure among cases, supports the validity of the study findings.

The shape of the dose-response relation between ingested arsenic and lung cancer risk is important when considering population cancer risks and drinking water standards. The only previous study with any dose-response information based on knowledge of individual exposure was the cohort study in Japan. 10 This study only included three dose-exposure categories, and the number of subjects was small at all dose categories, especially the two lowest (no cases reported for <50 μg/liter, and just one case for 50–990 μg/liter). Hence, the present study is the first to provide potentially useful dose-response data. Clear trends in dose response are apparent when concentrations are averaged over 1930–1994 (Table 5) and also when the peak exposure period 1958–1970 is considered (Table 6). The dose-response information in both tables is consistent with supralinearity, which has previously been explored in the context of lung cancer risks from inhaled arsenic. 16,17 We note that the apparently low OR associated with smoking alone is due the fact that the majority of smokers in a survey of two major cities in region II smoked fewer than ten cigarettes per day. 13 In our case-control study, even among patients with lung cancer, the average number of cigarettes smoked per day was only 13.3.

Published evidence concerning synergy between ingested arsenic and smoking in causing lung cancer is limited. A meta-analysis of studies of inhalation of inorganic arsenic and cigarette smoking supports a synergistic effect of the two exposures. 15 On the basis of small numbers, synergy between arsenic ingestion and smoking was suggested in the Japanese cohort study. 10 Even in the present study with more than ten times the number of lung cancer cases as in the Tsuda study, confidence limits are broad. The findings, however, support a synergistic action between the two exposures.

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We thank Adriana Tapia and the following institutions for their collaboration with the study: Servicio de Salud de Arica, Servicio de Salud de Iquique, Servicio de Salud de Antofagasta, and Servicio de Salud de Copiapó.

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Archives of Toxicology, 84(1): 17-24.
Water Air and Soil Pollution
Arsenic in domestic well water and health in Central Appalachia, USA
Shiber, JG
Water Air and Soil Pollution, 160(): 327-341.

Human and Ecological Risk Assessment
How creditable are cancer risk estimates from the SW Taiwan database for arsenic in drinking water?
Brown, KG
Human and Ecological Risk Assessment, 13(1): 180-190.
Rapid Communications in Mass Spectrometry
Study of interactions between arsenicals and thioredoxins (human and E. coli) using mass spectrometry
Wang, ZW; Zhang, HQ; Li, XF; Le, XC
Rapid Communications in Mass Spectrometry, 21(): 3658-3666.
American Journal of Epidemiology
Acute myocardial infarction mortality in comparison with lung and bladder cancer mortality in arsenic-exposed region II of Chile from 1950 to 2000
Yuan, Y; Marshall, G; Ferreccio, C; Steinmaus, C; Selvin, S; Liaw, J; Bates, MN; Smith, AH
American Journal of Epidemiology, 166(): 1381-1391.
Reviews of Environmental Contamination and Toxicology, Vol 196
Managing Hazardous Pollutants in Chile: Arsenic
Sancha, AM; O'Ryan, M
Reviews of Environmental Contamination and Toxicology, Vol 196, 196(): 123-146.
Recent advances in antineoplastic principles of Traditional Chinese Medicine
Tang, W
Pharmazie, 57(4): 223-232.

Science of the Total Environment
High exposure to arsenic from drinking water at several localities in eastern Croatia
Cavar, S; Klapec, T; Grubesic, RJ; Valek, M
Science of the Total Environment, 339(): 277-282.
American Journal of Epidemiology
Arsenic exposure from drinking water, dietary intakes of B vitamins and folate, and risk of high blood pressure in Bangladesh: A population-based, cross-sectional study
Chen, Y; Factor-Litvak, P; Howe, GR; Graziano, JH; Brandt-Rauf, P; Parvez, F; van Geen, A; Ahsan, H
American Journal of Epidemiology, 165(5): 541-552.
Journal of Environmental Biology
Arsenic in the environment: Effects on human health and possible prevention
Singh, N; Kumar, D; Sahu, AP
Journal of Environmental Biology, 28(2): 359-365.

International Archives of Occupational and Environmental Health
Arseniasis prevalence and mortality in a multiethnic, endemic township in Guizhou, China
Chen, JG; Lin, GF; Chen, YG; Jia, CG; Zhou, YS; Meng, H; Guo, WC; Golka, K; Liu, KJ; Shen, JH
International Archives of Occupational and Environmental Health, 82(4): 499-508.
Journal of the National Cancer Institute
Inorganic arsenic in drinking water: An evolving public health concern
Lubin, JH; Freeman, LEB; Cantor, KP
Journal of the National Cancer Institute, 99(): 906-907.
Journal of the Chemical Society of Pakistan
A Preliminary Study on the Arsenic Contamination of Underground Water of Matiari and Khairpur Districts, Sindh, Pakistan
Arain, GM; Aslam, M; Majidano, SA; Khuhawar, MY
Journal of the Chemical Society of Pakistan, 29(5): 463-467.

Environmental Geochemistry and Health
Chronic exposure of arsenic via drinking water and its adverse health impacts on humans
Rahman, MM; Ng, JC; Naidu, R
Environmental Geochemistry and Health, 31(): 189-200.
Are some animals more equal than others?
Mukherjee, A; Sengupta, MK; Hossain, MA; Ahamed, S; Lodh, D; Das, B; Nayak, B; Saha, KC; Mukherjee, SC; Pati, S; Dutta, RN; Chatterjee, G; Chakraborti, D
Toxicology, 208(1): 165-169.
American Journal of Epidemiology
Arsenic exposure and cardiovascular disease: A systematic review of the epidemiologic evidence
Navas-Acien, A; Sharrett, AR; Silbergeld, EK; Schwartz, BS; Nachman, KE; Burke, TA; Guallar, E
American Journal of Epidemiology, 162(): 1037-1049.
Human & Experimental Toxicology
Hormesis and precaution: the twain shall meet
Ricci, PF; MacDonald, TR
Human & Experimental Toxicology, 26(): 877-889.
International Archives of Occupational and Environmental Health
A follow-up study of mortality among the arseniasis patients exposed to indoor combustion of high arsenic coal in Southwest Guizhou Autonomous Prefecture, China
Chen, JG; Chen, YG; Zhou, YS; Lin, GF; Li, XJ; Jia, CG; Guo, WC; Du, H; Lu, HC; Meng, H; Zhang, XJ; Golka, K; Shen, JH
International Archives of Occupational and Environmental Health, 81(1): 9-17.
Journal American Water Works Association
Arsenic removal by coagulation - With aluminum, iron, titanium, and zirconium
Lakshmanan, D; Clifford, D; Samanta, G
Journal American Water Works Association, 100(2): 76-+.

Toxicological Sciences
Comparative Functional Genomic Analysis Identifies Distinct and Overlapping Sets of Genes Required for Resistance to Monomethylarsonous Acid (MMA(III)) and Arsenite (As-III) in Yeast
Jo, WJ; Loguinov, A; Wintz, H; Chang, M; Smith, AH; Kalman, D; Zhang, LP; Smith, MT; Vulpe, CD
Toxicological Sciences, 111(2): 424-436.
Separation and Purification Technology
Arsenate removal by Donnan dialysis: Effects of the accompanying components
Zhao, B; Zhao, HZ; Ni, JR
Separation and Purification Technology, 72(3): 250-255.
International Journal of Environmental Health Research
Levels of blood and urine chemicals associated with longer duration of having arsenicosis in Bangladesh
Khan, MMH; Hossain, MK; Kobayashi, K; Sakauchi, F; Yamashita, T; Ahmed, MF; Hossain, MD; Quamruzzaman, Q; Mori, M
International Journal of Environmental Health Research, 15(4): 289-301.
Environmental Health Perspectives
Hormesis and its place in nonmonotonic dose-response relationships: Some scientific reality checks
Mushak, P
Environmental Health Perspectives, 115(4): 500-506.
Toxicology and Applied Pharmacology
Arsenite promotes centrosome abnormalities under a p53 compromised status induced by 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)
Liao, WT; Yu, HS; Lin, PP; Chang, LW
Toxicology and Applied Pharmacology, 243(1): 55-62.
Acta Dermato-Venereologica
Increased Skin Cancer Mortality in Chile Beyond the Effect of Ageing: Temporal Analysis 1990 to 2005
Alonso, FT; Garmendia, ML; Bogado, ME
Acta Dermato-Venereologica, 90(2): 141-146.
Effect of arsenic on benzo[a]pyrene DNA adduct levels in mouse skin and lung
Evans, CD; LaDow, K; Schumann, BL; Savage, RE; Caruso, J; Vonderheide, A; Succop, P; Talaska, G
Carcinogenesis, 25(4): 493-497.
Cancer Research
Urogenital carcinogenesis in female CD1 mice induced by in utero arsenic exposure is exacerbated by postnatal diethylstilbestrol treatment
Waalkes, MP; Liu, J; Ward, JM; Powell, DA; Diwan, BA
Cancer Research, 66(3): 1337-1345.
Cancer Causes & Control
Trace elements and cancer risk: a review of the epidemiologic evidence
Silvera, SAN; Rohan, TE
Cancer Causes & Control, 18(1): 7-27.
Environmental Health
Arsenic in drinking water and cerebrovascular disease, diabetes mellitus, and kidney disease in Michigan: a standardized mortality ratio analysis
Meliker, JR; Wahl, RL; Cameron, LL; Nriagu, JO
Environmental Health, 6(): -.
American Journal of Epidemiology
Invited commentary: Arsenic and cancer of the urinary tract
Cantor, KP
American Journal of Epidemiology, 153(5): 419-421.

Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering
A study on arsenic removal from household drinking water
Yuan, T; Luo, QF; Hu, JY; Ong, SL; Ng, WJ
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering, 38(9): 1731-1744.
Cancer Epidemiology Biomarkers & Prevention
Cell type specificity of lung cancer associated with arsenic ingestion
Guo, HR; Wang, NS; Hu, H; Monson, RR
Cancer Epidemiology Biomarkers & Prevention, 13(4): 638-643.

Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering
Human health effects from chronic arsenic poisoning- A review
Kapaj, S; Peterson, H; Liber, K; Bhattacharya, P
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering, 41(): 2399-2428.
Lung Cancer
Lung cancer mortality is elevated in coal-mining areas of Appalachia
Hendryx, M; O'Donnell, K; Horn, K
Lung Cancer, 62(1): 1-7.
Preventive Medicine
Higher coronary heart disease and heart attack morbidity in Appalachian coal mining regions
Hendryx, M; Zullig, KJ
Preventive Medicine, 49(5): 355-359.
Environmental Health Perspectives
Arsenic exposure and age- and sex-specific risk for skin lesions: A population-based case-referent study in Bangladesh
Rahman, M; Vahter, M; Sohel, N; Yunus, M; Wahed, MA; Streatfield, PK; Ekstrom, EC; Persson, LA
Environmental Health Perspectives, 114(): 1847-1852.
Journal of the National Cancer Institute
Arsenic-related chromosomal alterations in bladder cancer
Moore, LE; Smith, AH; Eng, C; Kalman, D; DeVries, S; Bhargava, V; Chew, K; Moore, D; Ferreccio, C; Rey, OA; Waldman, FM
Journal of the National Cancer Institute, 94(): 1688-1696.

Arsenic in drinking water: Impact on human health
Hopenhayn, C
Elements, 2(2): 103-107.

Mutation Research-Reviews in Mutation Research
Arsenic in the aetiology of cancer
Tapio, S; Grosche, B
Mutation Research-Reviews in Mutation Research, 612(3): 215-246.
Toxicology and Applied Pharmacology
Further evidence against a direct genotoxic mode of action for arsenic-induced cancer
Klein, CB; Leszczynska, J; Hickey, C; Rossman, TG
Toxicology and Applied Pharmacology, 222(3): 289-297.
Anticancer Research
Elevated ERCC1 Gene Expression in Blood Cells Associated with Exposure to Arsenic from Drinking Water in Inner Mongolia
Mo, JY; Xia, YJ; Ning, ZX; Wade, TJ; Mumford, JL
Anticancer Research, 29(8): 3253-3259.

Toxicological Sciences
Involvement of Oxidative Stress and Activation of Aryl Hydrocarbon Receptor in Elevation of CYP1A1 Expression and Activity in Lung Cells and Tissues by Arsenic: An In Vitro and In Vivo Study
Wu, JP; Chang, LW; Yao, HT; Chang, H; Tsai, HT; Tsai, MH; Yeh, TK; Lin, P
Toxicological Sciences, 107(2): 385-393.
Journal of Exposure Science and Environmental Epidemiology
Increased lung cancer risks are similar whether arsenic is ingested or inhaled
Smith, AH; Ercumen, A; Yuan, Y; Steinmaus, CM
Journal of Exposure Science and Environmental Epidemiology, 19(4): 343-348.
Journal of Archaeological Science
Exploring chronic arsenic poisoning in pre-Columbian Chilean mummies
Arriaza, B; Amarasiriwardena, D; Cornejo, L; Standen, V; Byrne, S; Bartkus, L; Bandak, B
Journal of Archaeological Science, 37(6): 1274-1278.
American Journal of Epidemiology
Case-control study of bladder cancer and drinking water arsenic in the Western United States
Steinmaus, C; Yuan, Y; Bates, MN; Smith, AH
American Journal of Epidemiology, 158(): 1193-1201.
American Journal of Epidemiology
Decrements in lung function related to arsenic in drinking water in West Bengal, India
von Ehrenstein, OS; Mazumder, DNG; Yuan, Y; Samanta, S; Balmes, J; Sil, A; Ghosh, N; Hira-Smith, M; Haque, R; Purushothamam, R; Lahiri, S; Das, S; Smith, AH
American Journal of Epidemiology, 162(6): 533-541.
Environmental Health Perspectives
Increased mortality from lung cancer and bronchiectasis in young adults after exposure to arsenic in utero and in early childhood
Smith, AH; Marshall, G; Yuan, Y; Ferreccio, C; Liaw, J; von Ehrenstein, O; Steinmaus, C; Bates, MN; Selvin, S
Environmental Health Perspectives, 114(8): 1293-1296.
Critical Reviews in Toxicology
Oral exposure to inorganic arsenic: evaluation of its carcinogenic and non-carcinogenic effects
Schuhmacher-Wolz, U; Dieter, HH; Klein, D; Schneider, K
Critical Reviews in Toxicology, 39(4): 271-298.
Plasma Source Mass Spectrometry: Applications and Emerging Technologies
Coupled HPLC-ICP-MS analysis indicates highly hazardous concentrations of dissolved arsenic species in Cambodian groundwaters
Polya, DA; Gault, AG; Bourne, NJ; Lythgoe, PR; Cooke, DA
Plasma Source Mass Spectrometry: Applications and Emerging Technologies, (): 127-140.

P53 alterations in bladder tumors from arsenic and tobacco exposed patients
Moore, LE; Smith, AH; Eng, C; DeVries, S; Kalman, D; Bhargava, V; Chew, K; Ferreccio, C; Rey, OA; Hopenhayn, C; Biggs, ML; Bates, MN; Waldman, FM
Carcinogenesis, 24(): 1785-1791.
Environmental Health Perspectives
Chemical risks associated with consumption of shellfish harvested on the north shore of the St. Lawrence River's lower estuary
Gagnon, F; Tremblay, T; Rouette, J; Cartier, JF
Environmental Health Perspectives, 112(8): 883-888.
Nature Reviews Cancer
Opportunities for cancer epidemiology in developing countries
Rastogi, T; Hildesheim, A; Sinha, R
Nature Reviews Cancer, 4(): 909-917.
Journal of Hazardous Materials
Laboratory based approaches for arsenic remediation from contaminated water: Recent developments
Mondal, P; Majumder, CB; Mohanty, B
Journal of Hazardous Materials, 137(1): 464-479.
Progress in Environmental Science and Technology, Vol I
Arsenic in Central Appalachian (USA) domestic well water and human health
Shiber, J
Progress in Environmental Science and Technology, Vol I, (): 677-683.

Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering
Arsenic removal from household drinking water by adsorption
Yuan, T; Hu, JY; Ong, SL; Luo, QF; Ng, WJ
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering, 37(9): 1721-1736.
Ecotoxicology and Environmental Safety
Methodologies to examine the importance of host factors in bioavailability of metals
Burger, J; Diaz-Barriga, F; Marafante, E; Pounds, J; Robson, M
Ecotoxicology and Environmental Safety, 56(1): 20-31.
Science of the Total Environment
Arsenic and other elements in hair, nails, and skin-scales of arsenic victims in West Bengal, India
Samanta, G; Sharma, R; Roychowdhury, T; Chakraborti, D
Science of the Total Environment, 326(): 33-47.
Cancer Epidemiology Biomarkers & Prevention
Increased childhood liver cancer mortality and arsenic in drinking water in northern Chile
Liaw, J; Marshall, G; Yuan, Y; Ferreccio, C; Steinmaus, C; Smith, AH
Cancer Epidemiology Biomarkers & Prevention, 17(8): 1982-1987.
Journal of the National Cancer Institute
MW-year study of lung and bladder canceir mortality in Chile related to arsenic in drinking water
Marshall, G; Ferreccio, C; Yuan, Y; Bates, MN; Steinmaus, C; Selvin, S; Liaw, J; Smith, AH
Journal of the National Cancer Institute, 99(): 920-928.
Toxicology and Applied Pharmacology
Dose response evaluation of gene expression profiles in the skin of K6/ODC mice exposed to sodium arsenite
Ahlborn, GJ; Nelson, GM; Ward, WO; Knapp, G; Allen, JW; Ouyang, M; Roop, BC; Chen, Y; O'Brien, T; Kitchin, KT; Delker, DA
Toxicology and Applied Pharmacology, 227(3): 400-416.
Ca-A Cancer Journal for Clinicians
Frumkin, H; Thun, MJ
Ca-A Cancer Journal for Clinicians, 51(4): 254-262.

Toxicology and Applied Pharmacology
The cellular metabolism and systemic toxicity of arsenic
Thomas, DJ; Styblo, M; Lin, S
Toxicology and Applied Pharmacology, 176(2): 127-144.
Arsenic speciation in contaminated soils
Garcia-Manyes, S; Jimenez, G; Padro, A; Rubio, R; Rauret, G
Talanta, 58(1): 97-109.
PII S0039-9140(02)00259-X
Environmental Health Perspectives
Dietary intake and arsenic methylation in a US population
Steinmaus, C; Carrigan, K; Kalman, D; Atallah, R; Yuan, Y; Smith, AH
Environmental Health Perspectives, 113(9): 1153-1159.
Journal of Health Population and Nutrition
Arsenic and contamination of drinking-water in Bangladesh: A public-health perspective
Rahman, M
Journal of Health Population and Nutrition, 20(3): 193-197.

Toxicologic Pathology
Carcinogenic and systemic health effects associated with arsenic exposure - A critical review
Tchounwou, PB; Patlolla, AK; Centeno, JA
Toxicologic Pathology, 31(6): 575-588.
Environmental Geochemistry and Health
Health risks associated with contamination of groundwater by abandoned mines near Twisp in Okanogan County, Washington, USA
Peplow, D; Edmonds, R
Environmental Geochemistry and Health, 26(1): 69-79.

Journal of Toxicology and Environmental Health-Part A-Current Issues
Does arsenic exposure increase the risk for liver cancer?
Chiu, HF; Ho, SC; Wang, LY; Wu, TN; Yang, CY
Journal of Toxicology and Environmental Health-Part A-Current Issues, 67(): 1491-1500.
Environmental Research
Exposure to inorganic arsenic in drinking water and total urinary arsenic concentration in a Chilean population
Caceres, DD; Pino, P; Montesinos, N; Atalah, E; Amigo, H; Loomis, D
Environmental Research, 98(2): 151-159.
Critical Reviews in Toxicology
Methylated arsenicals: The implications of metabolism and carcinogenicity studies in rodents to human risk assessment
Cohen, SM; Arnold, LL; Eldan, M; Lewis, AS; Beck, BD
Critical Reviews in Toxicology, 36(2): 99-133.
Lung Cancer
Lung cancer mortality reduction after installation of tap-water supply system in an arseniasis-endemic area in Southwestern Taiwan
Chiu, HF; Ho, SC; Yang, CY
Lung Cancer, 46(3): 265-270.
Toxicology and Applied Pharmacology
Arsenic, internal cancers, and issues in inference from studies of low-level exposures in human populations
Cantor, KP; Lubin, JH
Toxicology and Applied Pharmacology, 222(3): 252-257.
Bulletin of Environmental Contamination and Toxicology
Isolation of Arsenite-Oxidizing Bacteria from Arsenic-Enriched Sediments from Camarones River, Northern Chile
Valenzuela, C; Campos, VL; Yanez, J; Zaror, CA; Mondaca, MA
Bulletin of Environmental Contamination and Toxicology, 82(5): 593-596.
Impact of life stage and duration of exposure on arsenic-induced proliferative lesions and neoplasia in C3H mice
Ahlborn, GJ; Nelson, GM; Grindstaff, RD; Waalkes, MP; Diwan, BA; Allen, JW; Kitchin, KT; Preston, RJ; Hernandez-Zavala, A; Adair, B; Thomas, DJ; Delker, DA
Toxicology, 262(2): 106-113.
Ground Water
What Does "Water Quality" Mean?
Chapelle, FH; Bradley, PM; McMahon, PB; Lindsey, BD
Ground Water, 47(6): 752-754.
Toxicology Letters
Zero exposure - a goal for environmental and occupational health?
Aitio, A
Toxicology Letters, 134(): 3-8.
PII S0378-4274(02)00157-1
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering
Bladder cancer and arsenic through drinking water: A systematic review of epidemiologic evidence
Christoforidou, EP; Riza, E; Kales, SN; Hadjistavrou, K; Stoltidi, M; Kastania, AN; Linos, A
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering, 48(): 1764-1775.
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering
Arsenic in water, food and cigarettes: A cancer risk to Pakistani population
Wadhwa, SK; Kazi, TG; Afridi, HI; Tuzen, M; Citak, D
Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engineering, 48(): 1776-1782.
Thoracic Surgery Clinics
The Changing Epidemic of Lung Cancer and Occupational and Environmental Risk Factors
Dresler, C
Thoracic Surgery Clinics, 23(2): 113-+.
Ecotoxicology and Environmental Safety
Simultaneous preconcentration of toxic elements in artificial saliva extract of smokeless tobacco product, mainpuri by cloud point extraction method
Arain, SS; Kazi, TG; Arain, JB; Afridi, HI; Brahman, KD; Shah, F; Naeemullah; Arain, S; Panhwar, AH
Ecotoxicology and Environmental Safety, 92(): 289-296.
Journal of Environmental Management
Arsenic removal by modified activated carbons with iron hydro(oxide) nanoparticles
Vitela-Rodriguez, AV; Rangel-Mendez, JR
Journal of Environmental Management, 114(): 225-231.
Cancer Epidemiology Biomarkers & Prevention
Drinking Water Arsenic in Northern Chile: High Cancer Risks 40 Years after Exposure Cessation
Steinmaus, CM; Ferreccio, C; Romo, JA; Yuan, Y; Cortes, S; Marshall, G; Moore, LE; Balmes, JR; Liaw, J; Golden, T; Smith, AH
Cancer Epidemiology Biomarkers & Prevention, 22(4): 623-630.
Plos One
Increased Childhood Mortality and Arsenic in Drinking Water in Matlab, Bangladesh: A Population-Based Cohort Study
Rahman, M; Sohel, N; Yunus, M; Chowdhury, ME; Hore, SK; Zaman, K; Bhuiya, A; Streatfield, PK
Plos One, 8(1): -.
ARTN e55014
American Journal of Epidemiology
Invited Commentary: Use of Arsenical Skin Lesions to Predict Risk of Internal Cancer - Implications for Prevention and Future Research
Ahsan, H; Steinmaus, C
American Journal of Epidemiology, 177(3): 213-216.
Clinics in Chest Medicine
Occupational and Environmental Causes of Lung Cancer
Field, RW; Withers, BL
Clinics in Chest Medicine, 33(4): 681-+.
Environmental Health Perspectives
The Broad Scope of Health Effects from Chronic Arsenic Exposure: Update on a Worldwide Public Health Problem
Naujokas, MF; Anderson, B; Ahsan, H; Aposhian, HV; Graziano, JH; Thompson, C; Suk, WA
Environmental Health Perspectives, 121(3): 295-302.
Environmental Health Perspectives
Early Life Arsenic Exposure and Acute and Long-term Responses to Influenza A Infection in Mice
Ramsey, KA; Foong, RE; Sly, PD; Larcombe, AN; Zosky, GR
Environmental Health Perspectives, 121(): 1187-1193.
Kidney Cancer Mortality: Fifty-year Latency Patterns Related to Arsenic Exposure
Yuan, Y; Marshall, G; Ferreccio, C; Steinmaus, C; Liaw, J; Bates, M; Smith, AH
Epidemiology, 21(1): 103-108.
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Arsenic in Drinking Water and Skin Lesions: Dose-Response Data from West Bengal, India
Haque, R; Mazumder, DG; Samanta, S; Ghosh, N; Kalman, D; Smith, MM; Mitra, S; Santra, A; Lahiri, S; Das, S; De, BK; Smith, AH
Epidemiology, 14(2): 174-182.
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Modification of Risk of Arsenic-Induced Skin Lesions by Sunlight Exposure, Smoking, and Occupational Exposures in Bangladesh
Chen, Y; Graziano, JH; Parvez, F; Hussain, I; Momotaj, H; van Geen, A; Howe, GR; Ahsan, H
Epidemiology, 17(4): 459-467.
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Arsenic in Drinking Water and Adult Mortality: A Population-based Cohort Study in Rural Bangladesh
Sohel, N; Persson, LÅ; Rahman, M; Streatfield, PK; Yunus, M; Ekström, E; Vahter, M
Epidemiology, 20(6): 824-830.
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Journal of Occupational and Environmental Medicine
Arsenic in Drinking Water and Bladder Cancer Mortality in the United States: An Analysis Based on 133 U.S. Counties and 30 Years of Observation
Lamm, SH; Engel, A; Kruse, MB; Feinleib, M; Byrd, DM; Lai, S; Wilson, R
Journal of Occupational and Environmental Medicine, 46(3): 298-306.

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Journal of Occupational and Environmental Medicine
Arsenic Methylation and Bladder Cancer Risk in Case–Control Studies in Argentina and the United States
Steinmaus, C; Bates, MN; Yuan, Y; Kalman, D; Atallah, R; Rey, OA; Biggs, ML; Hopenhayn, C; Moore, LE; Hoang, BK; Smith, AH
Journal of Occupational and Environmental Medicine, 48(5): 478-488.
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Journal of Thoracic Imaging
Occupational and Environmental Thoracic Malignancies
Gottschall, EB
Journal of Thoracic Imaging, 17(3): 189-197.

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arsenic; lung cancer; water pollutants; smoking; synergy; case-control study; environmental epidemiology

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