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Table 1: Reference Menck and Henderson, 1976 USA Decoufle et al. 1977 USA Williams et al. 1977 USA Leupker and Smith, 1978 USA Ahlberg et al. 1981 Sweden Epidemiological Studies of Exposure to Diesel Exhaust and Lung Cancer Studies Among Truck Drivers Study Design, Population, and Exposures Cohort Truck drivers Case-control Truck or tractor driver > 5 years as truck, bus or taxi driver Case-control Transportation Industry Truck drivers Railroad workers Truck Industry Cohort Total cohort Age 50-59 Cohort All truck drivers* Stockholm truck drivers# Cases or deaths Effect Measure 109 SMR 1.65 56 50 38 22 12 13 34 not given 161 OR 1.07 0.89 RR 1.17 1.52 1.40 1.34 SMR 1.21 1.37 RR 1.33 1.62 Confidence Interval a or P-Value p < 0.01 N.S. N.S. N.S. N.S. N.S. N.S. N.S. p < 0.001 1.13-1.56 1.15-2.28 Comments Included 2,161 lung cancer cases identified from death certificates in white males, aged 20 to 64, from 1968 through 1970, and 1777 incident cases of lung cancer reported to LA County Cancer Surveillance Program for 1972 - 73. Occupational in<strong>format</strong>ion obtained from death certificates or hospital admission sheets/medical records represented the last occupation and industry of employment. No data on smoking. Hospital-based study of 6,434 cancers cases admitted to Roswell Park Memorial Institute between 1956 and 1965. Controls were patients admitted with non-neoplastic disease. Occupation and smoking data obtained by questionnaire. Crude adjustment for smoking. Inadequate latency. Study examined cancer incidence and its relation to occupation and industry based on the U.S. 3rd National Cancer Survey. The number of cases of cancer at various sites were compared with that of cases at all other sites combined. Occupational history (main and recent employment) and data on smoking were obtained by interview (n = 7,518). IARC noted the potential bias in this study due to the relatively low level of response to the questionnaire (57%). Results were controlled for tobacco use, alcohol consumption, race, education and geographic location. Death certificates for a 3-month period in 1976 in the Central States Teamster population were examined. Comparison group was the US male population and was not adjusted for race. No data on smoking. Authors noted the follow-up was short. Retirees and members with lapsed benefits were excluded. 48,358 members were eligible in the 50-59 age group. Cohort consisted of 34,027 Swedish drivers considered to be exposed to diesel exhaust identified from the 1960 national census. Reference population consisted of blue-collar workers from the same census thought to have had no exposure to petroleum products or chemicals (n=686,708). No data on smoking; however, a study of 470 professional drivers in Stockholm found that 78% of fuel truck drivers and 31% of other truck drivers smoked compared to 40% in the Swedish population (citing unpublished study). # Subset of all non-fuel tank drivers. *Does not include fuel tank drivers. a 95% Confidence intervals unless noted. N.S.= Not significant. No confidence intervals or p-values reported in original study. DE = Diesel Exhaust. OR = Odds Ratio, RR = Relative Risk, SIR = Standardized Incidence Ratio, SMR = Standardized Mortality Ratio 435
Table 1 (continued): Reference Milne et al. 1983 USA Study Design, Population, and Exposures Case-control Occupational groups: All transport operatives Bus drivers Truck drivers Epidemiological Studies of Exposure to Diesel Exhaust and Lung Cancer Studies Among Truck Drivers Cases or deaths 36 4 23 Effect Measure OR 1.3 (1.1)* 3.5 (2.8)* Confidence Interval a or P-Value N.S. p < 0.05* p < 0.05* Comments Study compared lung cancer deaths with mortality from all other cancers in Alameda County between 1958 and 1962 to investigate possible associations between lung cancer and occupation. Data on cause of death and occupation were obtained from death certificates. No data on smoking or the types of vehicle engines. Results reported are for males. *Results in parentheses are ORs with potential occupationally related cancer removed from the control population. Significant risk estimates only observed when compared with control group before such cancers removed. Other transport Industry groups: Railroad 7 34 1.6 (1.3)* 0.7 (0.6)* N.S. N.S. Hall and Wynder, 1984 USA Case-control Usual employment: Total diesel-exposed - adjusted for smoking Selected occupations: Truck drivers Railroad workers Heavy equipment repairmen & operators - adjusted for smoking Smoking & DE exposure: Non & ex-smokers < 20 cigarettes/day > 20 cigerettes/day 45 22 5 10 10 10 7 0.8 (0.8)* OR 2.0 1.4 1.4 2.6 3.5 1.9 1.46* 0.82* 1.30* 1.2-3.2 0.8-2.4 0.7-2.6 0.5-12.8 1.0-11.8 0.6-5.5 0.9-2.3 0.5-1.4 0.8-2.1 Study consisted of 502 men with histologically confirmed primary lung cancer (20 to 80 years old) and matched control patients in 18 hospitals in six cities. Controls with tobaccorelated diseases were excluded. Patients were interviewed between December 1980 and <strong>November</strong> 1982. Smoking data were obtained. Occupations were grouped either dichotomously as exposed to diesel exhaust (warehousemen, bus drivers, truck drivers, railroad workers, heavy equipment operators) or unexposed. Exposure categorization also conducted by NIOSH-based occupational classifications with job title classified as having “probable” exposure to diesel exhaust as either “high” (10 cases), “moderate” (16 cases) or “little or none” (476 cases). No significantly elevated risks were reported in this latter analysis (data not shown here). See also Boffetta et al., 1990. *Compared DE exposed to unexposed within each smoking category. a 95% Confidence intervals unless noted. N.S.= Not significant. No confidence intervals or p-values reported in original study. DE = Diesel Exhaust. OR = Odds Ratio, RR = Relative Risk, SIR = Standardized Incidence Ratio, SMR = Standardized Mortality Ratio 436
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Air Toxics Hot Spots Program Risk A
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Prepared by: John D. Budroe, Ph.D.
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This document is one of five docume
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TABLE OF CONTENTS PREFACE i INTRODU
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N-Nitrosodimethylamine 401 N-Nitros
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Hot Spots Unit Risk and Cancer Pote
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Additional ATES and PETS documents
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data. If several data sets (dose an
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US EPA Calculation of Carcinogenic
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exposure to a concentration of 1 µ
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incidences for each of the dose lev
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computes the surface area of a sphe
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Comparison of Hot Spots Cancer Unit
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Gold, L., de Veciana, M., Backman,
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Animal Studies Rats Woutersen et al
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ased on sufficient evidence of carc
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ACETAMIDE CAS No: 60-35-5 I. PHYSIC
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Methodology Expedited Proposition 6
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cancer mortality. However, US EPA (
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Table 2. Lung adenoma incidence in
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Table 3 (continued). Acrylamide-ind
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Robinson M, Bull RJ, Knutsen GL, Sh
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Also, a trend was observed correlat
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eported. Cause-specific expected de
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Bio/Dynamics Inc. conducted a study
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examination. Interim sacrifices wer
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Table 8. Tumor incidence in male an
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Gaffey WR and Strauss ME. 1981. A m
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(technical grade; 98% pure) by gava
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International Agency for Research o
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still alive in the low-dose control
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ANILINE CAS No: 62-53-3 I. PHYSICAL
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fibrosarcomas, stromal sarcomas, ca
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ARSENIC (INORGANIC) CAS No: 7440-38
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elationship between arsenic exposur
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al. (1988) did not induce lung tumo
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A risk assessment was also conducte
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Chen C, Chuang Y, You S, Lin T and
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Schrauzer G, White D, McGinness J,
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Table 1: Summary of epidemiologic s
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had at least one animal demonstrati
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mesothelioma, recommended lifetime
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National Institute for Occupational
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BENZENE CAS No: 71-43-2 I. PHYSICAL
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Animal Studies Available experiment
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Table 3: Summary of NTP bioassay re
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Table 4: Summary of benzene low-dos
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Maltoni C, Conti B and Cotti G. 198
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a benign tumor of the kidney. No ba
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al. (1968) found no tumors in lifet
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following relationship, where C(t 1
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Miakawa M. and Yoshida O. 1975. Pro
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human population and that BPDE-DNA
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demonstrated the tumor initiating a
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Table 4: Bronchoalveolar tumors fro
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Table 5: IARC groupings of PAHs, mi
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Table 6 (continued): IARC Group 3 P
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Potency Equivalency Factors (PEF) f
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This was rounded to a PEF of 0.1. 1
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experiment (Takayama et al., 1985)
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Deutsch-Wenzel RP, Brune H, Grimmer
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Krewski D, Thorslund T and Withey J
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U.S. Environmental Protection Agenc
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Sorahan et al. (1983) studied cance
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Lijinsky W. 1986. Chronic bioassay
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the drinking water (Schroeder and M
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Table II. Effective dose, upper-bou
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BIS(2-CHLOROETHYL)ETHER CAS No: 111
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IV. DERIVATION OF CANCER POTENCY Ba
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BIS(CHLOROMETHYL)ETHER CAS No: 542-
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Table 1. Bis(chloromethyl)ether-ind
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Drew RT, Laskin S, Kuschner M and N
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ates for the 1968 U.S. male populat
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Table 1: Incidence of primary tumor
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National Institute of Occupational
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was less than 0.05 when controlling
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up period. The final cohort include
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If the cadmium-exposed workers incl
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on personnel records (20%); (3) eva
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were exposed to a continuous (23.5
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procedure (NLIN), the parameters we
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International Agency for Research o
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Two reports were published on cance
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Mendel rats, respectively), and sub
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Eschenbrenner A and Miller E. 1946.
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III. CARCINOGENIC EFFECTS Human Stu
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cancers, were less than expected. T
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and no cases of cancer (although cl
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There was a statistically significa
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NTP (1982a) also conducted an carci
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Several pathologists have independe
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hepatocellular adenoma/carcinoma tu
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carcinogenic potency may decline in
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Cochrane W, Singh J and Miles W. 19
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North Atlantic Treaty Organization,
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CHLORINATED PARAFFINS (average chai
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ased on dose-response data for beni
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chloroform in drinking water with k
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Overall, the present epidemiologica
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female dogs received toothpaste bas
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Calculated q 1 * values from the ab
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Hogan MD, Chi Py, Hoel DG and Mitch
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Table 1. Study design summary for N
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V. REFERENCES California Environmen
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toluidine. Followup of this subcoho
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feeding studies on by NCI (1979) us
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CHROMIUM (HEXAVALENT) CAS No: 18540
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expected rate may be inflated becau
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Oral Borneff et al. (1968) exposed
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CREOSOTE (COAL TAR-DERIVED) CAS No:
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from an inhalation exposure study (
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Table 1. Study design summary for N
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Table 1. Experimental design for ca
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Hazardous Substance Data Bank (HSDB
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Table 1: Tumor induction in Fischer
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Hazardous Substance Data Bank (HSDB
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Table 1. Experimental design of 2,4
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Additional analysis of these data b
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Jackson RJ, Greene CJ, Thomas JT, M
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Table 1. Tumor incidence in rats ex
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Girard R, Tolot F, Martin P and Bou
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exposed more than 16 years before t
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interpretation of dose extrapolatio
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1, 1-DICHLOROETHANE CAS No: 75-34-3
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Table 1b. Study design for carcinog
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National Cancer Institute (NCI) 197
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mice, hepatocellular carcinoma inci
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V. REFERENCES California Department
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DAB/day by gavage for the life of t
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2,4-DINITROTOLUENE CAS No: 121-14-2
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Ellis et al.(1979) (also reported b
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Final Statement of Reasons for OAL,
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to the small sample size and short
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In an inhalation study, Torkelson e
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V. REFERENCES American Conference o
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EPICHLOROHYDRIN CAS No: 106-89-8 I.
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espiratory tumors were noted in the
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Table 4. Epichlorohydrin-induced fo
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Konishi Y, Kawabata A, Denda A, Ike
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exposed to arsenicals for 20 months
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espectively (all statistically sign
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ETHYLENE DICHLORIDE CAS No: 107-06-
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Several factors have been suggested
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myelogenous leukemias (4 and 8 year
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statistically significant. CDHS not
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combined with the incidence in the
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incidence of primary brain tumors.
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Table 6 (continued): Organ/Sex Mali
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An Upper 95% Confidence Limit (UCL)
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ETHYLENE THIOUREA (ETU) CAS No: 96-
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male and female rats. Tumor inciden
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FORMALDEHYDE CAS No: 50-00-0 I. PHY
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presented an extension of a previou
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Methodology In developing a spectru
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Casanova M, Morgan KT, Steinhagen W
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Tobe M, Kaneko T, Uchida Y, Kamata
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Table 1. Hexachlorobenzene-induced
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50 pups (F 1 ) of each sex were ran
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Ertürk E, Lambrecht RW, Peters HA,
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Table 1. Liver hepatoma incidence i
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1988). An airborne unit risk factor
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HYDRAZINE CAS No: 302-01-2 I. PHYSI
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Methodology Inhalation A linearized
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LEAD AND LEAD COMPOUNDS (INORGANIC)
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and other occupational carcinogens
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y inhalation is similar for rats an
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Goyer RA. 1992. Nephrotoxicity and
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LINDANE (g-Hexachlorocyclohexane) C
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Using these relationships, a human
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METHYL TERT-BUTYL ETHER (MTBE) CAS
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Tumor incidences according to the r
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kidney changes indicative of chroni
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Interspecies scaling for oral doses
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Table 4 (continued): Dose Response
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Experimental Pathology Laboratories
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Animal Studies Male and female HaM/
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Gold L, Sawyer C, Magaw R, Backman
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Using the statistical tests (one-ta
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Table 1: Methylene chloride-induced
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Significant treatment-related incre
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National Toxicology Program (NTP) 1
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noted; however, the study duration
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Crump KS, Howe RB, Van Landingham C
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Table 1. Michler’s ketone-induced
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NICKEL AND NICKEL COMPOUNDS CAS No:
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the high exposure group was 14.0. A
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male and 121 female rats, was expos
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2.1 - 2.6 × 10 -4 (µg/m 3 ) -1 .
Page 393 and 394: U.S. Environmental Protection Agenc
Page 395 and 396: The increased incidence of bladder
Page 397 and 398: A linearized multistage procedure w
Page 399 and 400: N-NITROSO-N-METHYLETHYLAMINE CAS No
Page 401 and 402: Hazardous Substance Data Bank (HSDB
Page 403 and 404: propylamine in drinking water at 0.
Page 405 and 406: N-NITROSODIETHYLAMINE CAS No: 55-18
Page 407 and 408: Table 2. Treatment groups, concentr
Page 409 and 410: California Department of Health Ser
Page 411 and 412: animals and the second generation t
Page 413 and 414: ationale for selection of the OEHHA
Page 415 and 416: A unit risk value based upon air co
Page 417 and 418: N-NITROSODIPHENYLAMINE CAS No: 86-3
Page 419 and 420: Methodology Dosage estimates of NDP
Page 421 and 422: Crump KS, Howe RB. 1984. The multis
Page 423 and 424: Table 1. P-Nitrosodiphenylamine-ind
Page 425 and 426: N-NITROSOMORPHOLINE CAS No: 59-89-2
Page 427 and 428: IV. DERIVATION OF CANCER POTENCY Ba
Page 429 and 430: N-NITROSOPIPERIDINE CAS No: 100-75-
Page 431 and 432: Table 3. N-Nitrosopiperidine-induce
Page 433 and 434: Crump KS, Howe RB, Van Landingham C
Page 435 and 436: testicular tumors were noted in the
Page 437 and 438: PARTICULATE MATTER FROM DIESEL-FUEL
Page 439 and 440: etired railroad workers who had had
Page 441 and 442: employment (χ 2 test for trend: p
Page 443: elevated smoking-adjusted risk esti
Page 447 and 448: Table 1 (continued): Reference Damb
Page 449 and 450: Table 1 (continued): Reference Burn
Page 451 and 452: Table 1 (continued): Reference Raff
Page 453 and 454: Table 1 (continued): Epidemiologica
Page 455 and 456: Table 1 (continued): Epidemiologica
Page 457 and 458: Table 1 (continued): Reference Wegm
Page 459 and 460: Animal Studies Section 6.1 (Animal
Page 461 and 462: The variability, or heterogeneity,
Page 463 and 464: estimate for those studies for whic
Page 465 and 466: Figure 1: Estimates of Relative Ris
Page 467 and 468: q 1 * = Excess relative risk × CA
Page 469 and 470: Table 3: Number of Workers in the E
Page 471 and 472: u nexposed workers at zero concentr
Page 473 and 474: for each µg/m 3 of diesel exhaust
Page 475 and 476: Table 4: Values from Unit Risk for
Page 477 and 478: their findings that a reasonable es
Page 479 and 480: Garshick E, Schenker M, Woskie S an
Page 481 and 482: Lewis T, Green, FH MW, Burg J and L
Page 483 and 484: Rothman K. 1986. Modern epidemiolog
Page 485 and 486: PENTACHLOROPHENOL CAS No: 87-86-5 I
Page 487 and 488: The default lifespan for mice is 10
Page 489 and 490: documented. An excess risk from ski
Page 491 and 492: B6C3F 1 mice and F344/N rats were e
Page 493 and 494: This model, rather than a time depe
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POLYCHLORINATED BIPHENYLS (PCBs) CA
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several benign adenomatous lesions
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Ito et al. (1973) exposed groups of
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could not be characterized by chlor
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exposure (all pathways and mixtures
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National Toxicology Program 1993. T
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Table 1. Potassium bromate-induced
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1,3-PROPANE SULTONE CAS No: 1120-71
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PROPYLENE OXIDE CAS No: 75-56-9 I.
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oxide. In the NTP carcinogenicity s
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1,1,2,2-TETRACHLOROETHANE CAS No: 7
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assumed a body weight of 70 kg and
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total); an untreated control group
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TOLUENE DIISOCYANATE CAS No: 26471-
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Animal Studies The National Toxicol
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Mortillaro PT and Schiavon M. 1982.
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male or female rats. Increases in h
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TRICHLOROETHYLENE CAS No: 79-01-6 I
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A mortality analysis of a cohort of
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elative to that of the controls whi
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applied or metabolized. The range o
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Katz RM and Jowett D. 1981. Female
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10,000 ppm 2,4,6-trichlorophenol in
Page 543 and 544:
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Bionetics Research Laboratories. 19
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control; females: 6/10 exposed, 0/1
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over controls (p < 0.04). Other tum
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was increased (100/314 exposed vs.
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Table 3. Cancer potency estimates f
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Crouch E. 1983. Uncertainties in in
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VINYL CHLORIDE CAS No: 75-01-4 I. P
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Table 1 (continued): A Summary of E
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al., 1983). Histopathology of all o
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Table 3: Tumor incidences in 100 pp
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experiment, animals were exposed to
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Experiment BT1 Most previous risk a
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No statistical analyses of mortalit
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Table 11 gives unit risk estimates
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Bertazzi PA, Villa A, Foa V, Saia B
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Nicholson WJ, Hammond EC, Seidman H
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immunotoxicity, reproductive toxici
Page 579 and 580:
scheme. TEFs for two major noncance
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NATO/CCMS (1988a) Pilot Study on In
Page 583 and 584:
Table 2 Toxicity Equivalency Factor
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Table 4 A Comparison of CTEF- and I
Page 587 and 588:
Office of Environmental Health Haza
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Group 4: The agent is probably not
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TECHNICAL SUPPORT DOCUMENT FOR DESC
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US EPA IRIS Inhalation Unit Risk an
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TECHNICAL SUPPORT DOCUMENT FOR DESC
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as appropriate, and revise IRIS fil
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Chemical Exposure Route Study Type
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Page 603 and 604:
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Methyl tert-butyl ether p. 5: Added
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