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Griswold Jr DP, Casey AE, Weisburger EK and Weisburger JH. 1968. The carcinogenicity of multiple intragastric doses of aromatic and heterocyclic nitro or amino derivatives in young female Sprague-Dawley rats. Cancer Res 28:924-933. Hazardous Substances Data Bank (HSDB) 1994. National Library of Medicine, Bethesda, MD (CD- ROM version) Micromedex, Inc., Denver, CO International Agency for Research on Cancer (IARC). 1982. IARC Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans, Vol. 29: Some chemicals and dyestuffs. International Agency for Research on Cancer, Lyon, France. pp. 239-256. MacIntyre I. 1975. Experience of tumors in a British plant handling 3,3’-dichlorobenzidine. J Occup Med 17:23-26. Osanai H. 1976. An experimental study on hepatoma caused by aromatic amines. Journal of Science and Labor 52:179-201. Pliss GB. 1959. The blastomogenic action of dichlorobenzidine. Vopr Onkol 5:524-533. Pliss GB. 1963. On some regular relationships between carcinogenicity of aminodiphenyl derivatives and the structure of substance. Acta unio int cancrum 19:499-501. Saffiotti U, Cefis F, Montsano R and Sellakumar AR. 1967. Induction of bladder cancer in hamsters fed aromatic amines. In: Bladder Cancer: A Symposium. Deichmann WB and Lampe KF, eds., Birmingham AL, Aesculapius Publishing Co., pp.129-135. Sellakumar AR, Montesano R, and Saffiotti U. 1969. Aromatic amines carcinogenicity in hamsters (abstract no. 309). Proceedings of the American Association for Cancer Res 10:78. Stula, E.F., Barnes, J.R., Sherman, H., Reinhardt, C.F., Zapp, J.A., Jr. 1978. Liver and urinary bladder tumors in dogs from 3,3’-dichlorobenzidine. Journal of Environmental Pathology and Toxicology 1:475-490. Stula EF, Sherman H, Zapp Jr JA, Clayton Jr JW. 1975. Experimental neoplasia in rats from oral administration of 3,3’-dichlorobenzidine, 4,4’-methylene-bis(2-chloroaniline), and 4,4’-methylenebis(2-methylaniline). Toxicol Appl Pharmacol 31:159-176. Tatematsu, M, Miyata, Y, Mizutani, M, Hananouchi, M, Hirose, M, Ito, N. 1977. Summation effect of N-butyl-N-(4-hydroxybutyl) nitrosamine, N[4-(5-ntiro-2-furyl)-2-thiazolyl]formamide, N-2- fluorenylacetamide, and 3,3’-dichlorobenzidine on urinary bladder carcinogenesis in rats. Gann 68:193- 202. 251
1, 1-DICHLOROETHANE CAS No: 75-34-3 I. PHYSICAL AND CHEMICAL PROPERTIES (From HSDB, 1994) Molecular weight 98.97 Boiling point 57.3°C (ATSDR, 1990) Melting point -96.7°C (ATSDR, 1990) Vapor pressure 230 mm Hg at 25°C (ATSDR, 1990) Air concentration conversion 1 ppm = 4.05 mg/m 3 II. HEALTH ASSESSMENT VALUES Unit Risk Factor: 1.6 E-6 (µg/m 3 ) -1 Slope Factor: 5.7 E-3 (mg/kg-day) -1 [Female rat mammary gland adenocarcinoma tumor data (NCI, 1977), contained in Gold et al. database (1990), expedited Proposition 65 methodology (Cal/EPA, 1992), cross-route extrapolation.] III. CARCINOGENIC EFFECTS Human Studies No studies on the potential carcinogenic effects of 1,1-dichloroethane in humans are known to exist. Animal Studies Male and female Osborne-Mendel rats and B6C3F 1 mice were exposed to 1,1-dichloroethane dissolved in corn oil by gavage (NCI, 1977). The study design is summarized in Tables 1a and 1b. Dosing was performed once/day, 5 days/week. Dosing of the low- and high-dose mouse treatment groups was performed cyclically in the latter part of the experimental period; one exposure-free week was followed by 4 weeks of exposure. Dose-related increases were noted in mammary adenocarcinomas and hemangiosarcomas in female rats. Statistically significant increases were observed in endometrial stromal polyps in high-dose female mice (4/46 compared to 0/79 for controls, p = 0.017) and in hepatocellular carcinomas in high-dose male mice (8/32 compared to 6/72 in pooled vehicle controls, p = 0.027). Female rat tumor incidence data is listed in Table 2. Klaunig et al. (1986) exposed male B6C3F 1 mice to 1,1-dichloroethane in drinking water for 52 weeks. Exposure levels were 0, 835 and 2500 mg/l. Group sizes were 35 mice/group; 10 mice/group were killed after 24 weeks. Histology was only performed on kidney, liver and lung samples. No 252
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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
Page 209 and 210: Hogan MD, Chi Py, Hoel DG and Mitch
Page 211 and 212: Table 1. Study design summary for N
Page 213 and 214: V. REFERENCES California Environmen
Page 215 and 216: toluidine. Followup of this subcoho
Page 217 and 218: feeding studies on by NCI (1979) us
Page 219 and 220: CHROMIUM (HEXAVALENT) CAS No: 18540
Page 221 and 222: expected rate may be inflated becau
Page 223 and 224: Oral Borneff et al. (1968) exposed
Page 225 and 226: CREOSOTE (COAL TAR-DERIVED) CAS No:
Page 227 and 228: from an inhalation exposure study (
Page 229 and 230: U.S. Environmental Protection Agenc
Page 231 and 232: Table 1. Study design summary for N
Page 233 and 234: Methodology Expedited Proposition 6
Page 235 and 236: Table 1. Experimental design for ca
Page 237 and 238: Hazardous Substance Data Bank (HSDB
Page 239 and 240: Table 1: Tumor induction in Fischer
Page 241 and 242: Hazardous Substance Data Bank (HSDB
Page 243 and 244: Table 1. Experimental design of 2,4
Page 245 and 246: Methodology Expedited Proposition 6
Page 247 and 248: Additional analysis of these data b
Page 249 and 250: IV. DERIVATION OF CANCER POTENCY Ba
Page 251 and 252: Jackson RJ, Greene CJ, Thomas JT, M
Page 253 and 254: Table 1. Tumor incidence in rats ex
Page 255 and 256: Girard R, Tolot F, Martin P and Bou
Page 257 and 258: exposed more than 16 years before t
Page 259: interpretation of dose extrapolatio
Page 263 and 264: Table 1b. Study design for carcinog
Page 265 and 266: National Cancer Institute (NCI) 197
Page 267 and 268: mice, hepatocellular carcinoma inci
Page 269 and 270: V. REFERENCES California Department
Page 271 and 272: DAB/day by gavage for the life of t
Page 273 and 274: 2,4-DINITROTOLUENE CAS No: 121-14-2
Page 275 and 276: Ellis et al.(1979) (also reported b
Page 277 and 278: Final Statement of Reasons for OAL,
Page 279 and 280: to the small sample size and short
Page 281 and 282: In an inhalation study, Torkelson e
Page 283 and 284: V. REFERENCES American Conference o
Page 285 and 286: EPICHLOROHYDRIN CAS No: 106-89-8 I.
Page 287 and 288: espiratory tumors were noted in the
Page 289 and 290: Table 4. Epichlorohydrin-induced fo
Page 291 and 292: Konishi Y, Kawabata A, Denda A, Ike
Page 293 and 294: exposed to arsenicals for 20 months
Page 295 and 296: espectively (all statistically sign
Page 297 and 298: ETHYLENE DICHLORIDE CAS No: 107-06-
Page 299 and 300: Several factors have been suggested
Page 301 and 302: U.S. Environmental Protection Agenc
Page 303 and 304: myelogenous leukemias (4 and 8 year
Page 305 and 306: statistically significant. CDHS not
Page 307 and 308: combined with the incidence in the
Page 309 and 310: 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
Page 381 and 382:
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 .
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U.S. Environmental Protection Agenc
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The increased incidence of bladder
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A linearized multistage procedure w
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N-NITROSO-N-METHYLETHYLAMINE CAS No
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Hazardous Substance Data Bank (HSDB
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propylamine in drinking water at 0.
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N-NITROSODIETHYLAMINE CAS No: 55-18
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Table 2. Treatment groups, concentr
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California Department of Health Ser
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animals and the second generation t
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ationale for selection of the OEHHA
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A unit risk value based upon air co
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N-NITROSODIPHENYLAMINE CAS No: 86-3
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Methodology Dosage estimates of NDP
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Crump KS, Howe RB. 1984. The multis
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Table 1. P-Nitrosodiphenylamine-ind
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N-NITROSOMORPHOLINE CAS No: 59-89-2
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Page 429 and 430:
N-NITROSOPIPERIDINE CAS No: 100-75-
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Table 3. N-Nitrosopiperidine-induce
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Crump KS, Howe RB, Van Landingham C
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testicular tumors were noted in the
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PARTICULATE MATTER FROM DIESEL-FUEL
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etired railroad workers who had had
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employment (χ 2 test for trend: p
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elevated smoking-adjusted risk esti
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Table 1 (continued): Reference Miln
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Table 1 (continued): Reference Damb
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Table 1 (continued): Reference Burn
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Table 1 (continued): Reference Raff
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Table 1 (continued): Epidemiologica
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Table 1 (continued): Epidemiologica
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Table 1 (continued): Reference Wegm
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Animal Studies Section 6.1 (Animal
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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
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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
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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.
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oxide. In the NTP carcinogenicity s
Page 517 and 518:
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
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.
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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
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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
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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
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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
Page 589 and 590:
Group 4: The agent is probably not
Page 591 and 592:
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:
Page 605 and 606:
Methyl tert-butyl ether p. 5: Added
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