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Table 2 (continued). Cupferron-induced hemangiosarcoma incidence in male and female F344 rats and B6C3F 1 mice (NCI, 1978) 1. Doses as reported by Gold et al. (1984). 2. Tumor incidences as reported by Gold et al. (1984) IV. DERIVATION OF CANCER POTENCY Basis for Cancer Potency Results of the NCI (1978) feeding study in male and female B6C3F 1 mice and Fischer 344 rats are listed in Gold et al. (1984). Benign and malignant vascular tumors as well as tumors at other sites were observed in mice and rats of both sexes treated with cupferron. Cancer potency is based on the data for vascular tumors in the male rat (see Table 2) because the rat is the more sensitive of the species tested, and the male appears to be slightly more sensitive than the female (Cal/EPA, 1992). Methodology Expedited Proposition 65 methodology (with cross-route extrapolation) was used to derive a cancer potency factor. Analysis of the data set using the computer program TOX_RISK (Crump et al., 1991) indicated that inclusion of the high dose group resulted in a p-value of = 0.05 based on the chi-square goodness-of-fit test, indicating non-linearity. Following procedures described by US EPA (Anderson et al., 1983), the high dose group was excluded from the analysis to correct for the poor fit (Cal/EPA, 1992). 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 Anderson, EL and the Carcinogen Assessment Group of the U.S. Environmental Protection Agency 1983. Quantitative approaches in use to assess cancer risk. Risk Anal 3:277-295. 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. Crump KS, Howe RB, Van Landingham C and Fuller WG. 1991. TOXRISK Version 3. TOXicology RISK Assessment Program. KS Crump Division, Clement International Division, 1201 Gaines Street, Ruston LA 71270. Gold L, Sawyer C, Magaw R, Backman G, de Veciana M, Levinson R, Hooper N, Havender W, Bernstein L, Peto R, Pike M and Ames B. 1984. A Carcinogenic Potency Database of the standardized results of animal bioassays. Environ Health Perspect 58:9-319. 227
Hazardous Substance Data Bank (HSDB) 1994. National Library of Medicine, Bethesda MD (CD- ROM Version). Micromedix, Inc., Denver CO, Edition 22. National Cancer Institute (NCI) 1978. Bioassay of Cupferron for Possible Carcinogenicity. CAS No. 135-20-6. Carcinogenesis Technical Report Series No. 100. NCI-CG-TR-140. DHEW Publication No. (NIH) 78-1350. U.S. Department of Health, Education and Welfare, NCI Carcinogenesis Testing Program, Bethesda, MD. 228
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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
Page 185 and 186: NTP (1982a) also conducted an carci
Page 187 and 188: Several pathologists have independe
Page 189 and 190: hepatocellular adenoma/carcinoma tu
Page 191 and 192: carcinogenic potency may decline in
Page 193 and 194: Cochrane W, Singh J and Miles W. 19
Page 195 and 196: North Atlantic Treaty Organization,
Page 197 and 198: CHLORINATED PARAFFINS (average chai
Page 199 and 200: ased on dose-response data for beni
Page 201 and 202: chloroform in drinking water with k
Page 203 and 204: Overall, the present epidemiologica
Page 205 and 206: female dogs received toothpaste bas
Page 207 and 208: 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: Table 1. Experimental design for ca
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 and 260: interpretation of dose extrapolatio
Page 261 and 262: 1, 1-DICHLOROETHANE CAS No: 75-34-3
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.
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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 .
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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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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
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Table 4: Values from Unit Risk for
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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
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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.
Page 553 and 554:
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
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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
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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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