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N-nitrosomorpholine, for life (Haas et al., 1973). Males received 24.6, 49.2 or 98.4 mg/kg body weight; females recieved 28.1, 56.2 or 112.4 mg/kg body weight. Treatment-related increases in the incidence of respiratory tract tumors (primarily in the nasal cavity and trachea) were observed. Lijinsky et al. (1976) exposed male Sprague-Dawley rats (30/exposure group) to N-nitrosomorpholine in drinking water (8 or 40 mg/l, 5 days/week; total dose 0.21 and 1.05 mM, respectively) for 30 weeks. The animals were then observed for the remainder of their lifetime. Hepatocellular (benign or malignant) tumors were reported in 11/30 and 16/30 low- and high-dose animals, respectively. Hemangioendothelial tumors were reported in 1/30 and 2/30 low- and high-dose animals, respectively. The authors did not report the inclusion of a control group in this study. Ketkar et al. (1983) exposed male and female Syrian golden hamsters (30/sex/group) to 0.001, 0.005 or 0.01% N-nitrosomorpholine in the drinking water for life; untreated control groups (50 animals/sex) were also included. Increased incidences of benign and malignant tumors of the respiratory tract (primarily papillary polyps, papillomas and epidermoid carcinomas of the larynx and trachea) and the gastrointestinal tract (primarily liver tumors, including hepatocellular adenomas and carcinomas) were observed in both males and females. No corresponding tumors were observed in the control groups. Tumor incidence data is listed in Table 1. Table 1. N-nitrosomorpholine-induced tumor incidence in male and female Syrian golden hamsters (Ketkar et al., 1983) Dose group Average dose 1 (mg/kg-day) Tumor type Tumor incidence 2 male controls 0 respiratory tract 0/50 male low dose 1.2 8/29 male mid dose 6 13/29 male high dose 12 21/30 male controls 0 liver tumors 0/50 male low dose 1.2 4/29 male mid dose 6 9/29 male high dose 12 18/30 female controls 0 respiratory tract 0/50 female low dose 1.36 14/28 female mid dose 6.82 16/30 female high dose 13.6 22/30 female controls 0 liver tumors 0/50 female low dose 1.36 0/28 female mid dose 6.82 2/30 female high dose 13.6 6/30 1. Doses as reported by Gold et al. (1987). 2. Tumor incidences as reported by Gold et al. (1987). 417
IV. DERIVATION OF CANCER POTENCY Basis for Cancer Potency Gold et al. (1987) list results from a drinking water study in male and female Syrian Golden hamsters (Ketkar et al., 1983). Tumors of the respiratory system and liver were observed at significant levels in both sexes; females were slightly more sensitive than males. Cancer potency for N-nitrosomorpholine is based on tumors of the respiratory system, the more sensitive site, in female hamsters (see Table 1) (Cal/EPA, 1992). Methodology Expedited Proposition 65 methodology (with cross-route extrapolation) was used to derive a cancer potency factor. A unit risk factor was then calculated by <strong>OEHHA</strong>/ATES from the cancer potency factor using a reference human body weight of 70 kg and an inspiration rate of 20 m 3 /day. V. REFERENCES Bannasch P and Müller H-A. 1964. Lichtmikroskopische untersuchungen über die wirkung von N- nitrosomorpholin auf die liber von ratte und maus (Ger.). Arzneimittelforschung 14:805-814. California Environmental Protection Agency (Cal/EPA) 1992. Expedited Cancer Potency Values and Proposed Regulatory Levels for Certain Proposition 65 Carcinogens. Office of Environmental Health Hazard Assessment, Reproductive and Cancer Hazard Assessment Section, Berkeley, CA. Gold L, Slone T, Backman G, Magaw R, Da Costa M and Ames, B. 1987. Second chronological supplement to the Carcinogenic Potency Database; Standardized results of animal bioassays published through December 1984 and by the National Toxicology Program through May 1986. Environ Health Perspect 74:237-329. Garcia H and Lijinsky W. 1972. Tumorigenicity of five cyclic nitrosamines in MRC rats. Z Krebsforsch 77:257-261. Haas H, Mohr U and Krüger FW. 1973. Comparative studies with different doses of N]- nitrosomorpholine, N-nitrosopiperidine, N-nitrosomethylurea, and dimethylnitrosamine in Syrian golden hamsters. J Natl Cancer Inst 51:1295-1301. Hazardous Substance Data Bank (HSDB) 1994. National Library of Medicine, Bethesda MD (CD- ROM Version). Micromedix, Inc., Denver CO, Edition 22. 418
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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
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 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
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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: N-NITROSOMORPHOLINE CAS No: 59-89-2
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
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
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Garshick E, Schenker M, Woskie S an
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Lewis T, Green, FH MW, Burg J and L
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Rothman K. 1986. Modern epidemiolog
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PENTACHLOROPHENOL CAS No: 87-86-5 I
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The default lifespan for mice is 10
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documented. An excess risk from ski
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B6C3F 1 mice and F344/N rats were e
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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
Page 539 and 540:
Katz RM and Jowett D. 1981. Female
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10,000 ppm 2,4,6-trichlorophenol in
Page 543 and 544:
Page 545 and 546:
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.
Page 553 and 554:
Table 3. Cancer potency estimates f
Page 555 and 556:
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
Page 581 and 582:
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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