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V. REFERENCES Althoff J, Krueger FW and Mohr U. 1973. Brief communication: carcinogenic effect of dipropylnitrosamine and compounds related by beta-oxidation. Journal of the National Cancer Institutute 51:287-288. Druckrey H, Preussmann R, Ivankovic S, and Schmähl D. 1967. Organotrope carcinogene Wirkungen bei 65 verschiedenen N-Nitroso-Verbindungen an BD-Ratten. Z Krebsforsch 69:103-201. Hazardous Substance Data Bank (HSDB) 1994. National Library of Medicine, Bethesda MD (CD- ROM Version). Micromedix, Inc., Denver CO, Edition 22. Lijinsky W and Reuber MD. 1981. Comparative carcinogenesis by some aliphatic nitrosamines in Fischer rats. Cancer Lett 14:297-302. Lijinsky W and Reuber MD. 1983. Carcinogenesis in Fischer rats by nitrosodipropylamine, nitrosodibutylamine and nitrosobis(2-oxopropyl)amine given by gavage. Cancer Lett 19:207-213. Lijinsky W and Taylor HW. 1979. Carcinogenicity of methylated derivatives of N-nitrosodiethylamine and related compounds in Sprague-Dawley rats. J Natl Cancer Inst 62:407-410. Lijinsky W and Taylor HW. 1978. Comparative carcinogenicity of some derivatives of nitrosodi-npropylamine in rats. Exotoxicol Environ Saf 2:421-426. Pour P, Kruger FW, Cardesa A, Althoff J and Mohr U. 1973. Carcinogenic effect of di-npropylnitrosamine in Syrian golden hamsters. J Natl Cancer Inst 51:1019-1027. Reznick G, Mohr U and Kruger FW. 1975. Carcinogenic effects of di-n-propylnitrosmine, betahydroxypropyl-n-propylnitrosamine and methyl-n-propylnitrosamine on Sprague-Dawley rats. J Natl Cancer Inst 54:937-943. U.S. Environmental Protection Agency (US EPA). 1986. Health and Environmental Effects Profile for Nitrosamines. Prepared by the Office of Health and Environmental Assessment, Environmental Criteria and Assessment Office, Cincinnati, OH for the Office of Solid Waste and Emergency Response, Washington, DC. 395
N-NITROSODIETHYLAMINE CAS No: 55-18-5 I. PHYSICAL AND CHEMICAL PROPERTIES (From HSDB, 1995) Molecular weight 102.1 Boiling point 175-177° C Melting point Not found Vapor pressure 0.86 mm Hg @ 20° C Air concentration conversion 1 ppm = 4.2 mg/m 3 @ 25° C II. HEALTH ASSESSMENT VALUES Unit Risk Factor: 1.0 E-2 (µg/m 3 ) -1 Slope Factor: 3.6 E+1 (mg/kg-day) -1 [Calculated from a cancer potency factor derived by CDHS (1988)] III. CARCINOGENIC EFFECTS Human Studies There is no direct evidence that links nitrosamines, including N-nitrosodiethylamine (NDEA), to human cancer. The US EPA (1980) concluded that the epidemiological studies to date were inadequate to establish a valid causal relationship between nitrosamine exposure and human cancer. The US EPA (1980) also concluded that it was highly improbable that humans are refractory to the carcinogenic effects of nitrosamines considering the number of animal species that show increased tumor incidence following nitrosamine exposure. Animal Studies A number of qualitative studies were conducted in a range of species, including rats, mice, hamsters, guinea pigs, rabbits, dogs, and monkeys (Yamamoto et al., 1972; Druckrey et al., 1967; Magee et al., 1976; Rajewski et al., 1966; Tomatis, 1973). In addition to these studies, a number of later studies show evidence of quantitative dose-response relationships. Drinking water containing a range of concentrations from 0.033 to 16.896 ppm NDEA was administered to male and female Colworth rats (60/sex/group) for their natural lifespan (Peto et al., 1982; 1984). The control groups consisted of 240 rats/sex. Nearly all animals exposed to the high dose of NDEA died from tumors of the liver or esophagus (Table 1). Other sites showing an increase in tumors included the lower jaw, stomach, kidney, ovaries, seminal vesicles, and nasopharynx. 396
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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
Page 353 and 354: Using these relationships, a human
Page 355 and 356: METHYL TERT-BUTYL ETHER (MTBE) CAS
Page 357 and 358: Tumor incidences according to the r
Page 359 and 360: kidney changes indicative of chroni
Page 361 and 362: Interspecies scaling for oral doses
Page 363 and 364: Table 4 (continued): Dose Response
Page 365 and 366: Experimental Pathology Laboratories
Page 367 and 368: Animal Studies Male and female HaM/
Page 369 and 370: Gold L, Sawyer C, Magaw R, Backman
Page 371 and 372: Using the statistical tests (one-ta
Page 373 and 374: Table 1: Methylene chloride-induced
Page 375 and 376: Significant treatment-related incre
Page 377 and 378: National Toxicology Program (NTP) 1
Page 379 and 380: noted; however, the study duration
Page 381 and 382: Crump KS, Howe RB, Van Landingham C
Page 383 and 384: Table 1. Michler’s ketone-induced
Page 385 and 386: NICKEL AND NICKEL COMPOUNDS CAS No:
Page 387 and 388: the high exposure group was 14.0. A
Page 389 and 390: male and 121 female rats, was expos
Page 391 and 392: 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: propylamine in drinking water at 0.
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 and 444: elevated smoking-adjusted risk esti
Page 445 and 446: Table 1 (continued): Reference Miln
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
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Table 1 (continued): Epidemiologica
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Table 1 (continued): Reference Wegm
Page 459 and 460:
Animal Studies Section 6.1 (Animal
Page 461 and 462:
The variability, or heterogeneity,
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estimate for those studies for whic
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Figure 1: Estimates of Relative Ris
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q 1 * = Excess relative risk × CA
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Table 3: Number of Workers in the E
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u nexposed workers at zero concentr
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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
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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
Page 495 and 496:
POLYCHLORINATED BIPHENYLS (PCBs) CA
Page 497 and 498:
several benign adenomatous lesions
Page 499 and 500:
Ito et al. (1973) exposed groups of
Page 501 and 502:
could not be characterized by chlor
Page 503 and 504:
exposure (all pathways and mixtures
Page 505 and 506:
National Toxicology Program 1993. T
Page 507 and 508:
Table 1. Potassium bromate-induced
Page 509 and 510:
1,3-PROPANE SULTONE CAS No: 1120-71
Page 511 and 512:
Page 513 and 514:
PROPYLENE OXIDE CAS No: 75-56-9 I.
Page 515 and 516:
oxide. In the NTP carcinogenicity s
Page 517 and 518:
1,1,2,2-TETRACHLOROETHANE CAS No: 7
Page 519 and 520:
assumed a body weight of 70 kg and
Page 521 and 522:
total); an untreated control group
Page 523 and 524:
TOLUENE DIISOCYANATE CAS No: 26471-
Page 525 and 526:
Animal Studies The National Toxicol
Page 527 and 528:
Mortillaro PT and Schiavon M. 1982.
Page 529 and 530:
male or female rats. Increases in h
Page 531 and 532:
TRICHLOROETHYLENE CAS No: 79-01-6 I
Page 533 and 534:
A mortality analysis of a cohort of
Page 535 and 536:
elative to that of the controls whi
Page 537 and 538:
applied or metabolized. The range o
Page 539 and 540:
Katz RM and Jowett D. 1981. Female
Page 541 and 542:
10,000 ppm 2,4,6-trichlorophenol in
Page 543 and 544:
Page 545 and 546:
Bionetics Research Laboratories. 19
Page 547 and 548:
control; females: 6/10 exposed, 0/1
Page 549 and 550:
over controls (p < 0.04). Other tum
Page 551 and 552:
was increased (100/314 exposed vs.
Page 553 and 554:
Table 3. Cancer potency estimates f
Page 555 and 556:
Crouch E. 1983. Uncertainties in in
Page 557 and 558:
VINYL CHLORIDE CAS No: 75-01-4 I. P
Page 559 and 560:
Table 1 (continued): A Summary of E
Page 561 and 562:
al., 1983). Histopathology of all o
Page 563 and 564:
Table 3: Tumor incidences in 100 pp
Page 565 and 566:
experiment, animals were exposed to
Page 567 and 568:
Experiment BT1 Most previous risk a
Page 569 and 570:
No statistical analyses of mortalit
Page 571 and 572:
Table 11 gives unit risk estimates
Page 573 and 574:
Bertazzi PA, Villa A, Foa V, Saia B
Page 575 and 576:
Nicholson WJ, Hammond EC, Seidman H
Page 577 and 578:
immunotoxicity, reproductive toxici
Page 579 and 580:
scheme. TEFs for two major noncance
Page 581 and 582:
NATO/CCMS (1988a) Pilot Study on In
Page 583 and 584:
Table 2 Toxicity Equivalency Factor
Page 585 and 586:
Table 4 A Comparison of CTEF- and I
Page 587 and 588:
Office of Environmental Health Haza
Page 589 and 590:
Group 4: The agent is probably not
Page 591 and 592:
TECHNICAL SUPPORT DOCUMENT FOR DESC
Page 593 and 594:
US EPA IRIS Inhalation Unit Risk an
Page 595 and 596:
TECHNICAL SUPPORT DOCUMENT FOR DESC
Page 597 and 598:
as appropriate, and revise IRIS fil
Page 599 and 600:
Chemical Exposure Route Study Type
Page 601 and 602:
Page 603 and 604:
Page 605 and 606:
Methyl tert-butyl ether p. 5: Added
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