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adenomas/mouse (20 animals/group, both sexes combined) was 0.19 ± 0.1, 0.60 ± 0.2, 0.50 ± 0.27 and 0.60 ± 0.15 in the control, low, medium and high-dose groups, respectively. The incidence of lung adenomas in the high-dose group was significantly increased (p < 0.05 by Student’s T-test or chisquare test). IV. DERIVATION OF CANCER POTENCY Basis for Cancer Potency The NCI (1978) carcinogenicity bioassay demonstrated a statistically significant increased incidence of squamous cell papillomas and carcinomas of the forestomach in low-dose male mice (2/46, p < 0.029) and low-dose (3/47; p < 0.003) and high-dose (3/45; p < 0.003) female mice when compared to tumor incidences in male (1/180) and female (1/180) historical controls. The female mouse tumor incidence data from this study was chosen as the basis of a cancer potency factor because it demonstrated induction of a rare tumor type by allyl chloride in the most sensitive sex of a sensitive species. Methodology Transformed doses were calculated as follows: transformed dose = experimental dose × (5 days/7 days) × (78 weeks/92 weeks) Animals were dosed 5 days/week, and the duration of exposure and of the experiment were 78 and 92 weeks, respectively. Experimental doses were 129 and 258 mg/kg/day; transformed doses were 78 and 156 mg/kg/day. A linearized multistage procedure (GLOBAL82) was then applied to the tumor incidence data; the resulting unadjusted cancer potency factor (q 1 * ) was 1.01 E-3 (mg/kg/day) -1 . A q 1 * for humans was calculated from the unadjusted q 1 * as follows: human q 1 * = unadjusted q 1 * × (70 kg/0.025 kg) 1/3 × (104 weeks/92 weeks) 3 = 2.1 E-2 (mg/kg/day) -1 The reference human body weight and the average female mouse weight were 70 kg and 0.025 kg, respectively, and the experiment length and the mouse lifespan were 92 weeks and 104 weeks, respectively. A unit risk factor of 6.0 E-6 (µg/m 3 ) -1 was derived from the human q 1 * by <strong>OEHHA</strong>/ATES using an inspiration rate of 20 m 3 /day. V. REFERENCES Hazardous Substance Data Bank (HSDB) 1994. National Library of Medicine, Bethesda MD (CD- ROM Version). Micromedix, Inc., Denver CO, Edition 22. 53
International Agency for Research on Cancer (IARC) 1985. Allyl Chloride. In: IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man, Volume 36. IARC, Lyon, France, pp. 39- 54. National Cancer Institute 1977. Bioassay of Allyl Chloride for Possible Carcinogenicity. Carcinogenesis Technical Report Series. NCI-CG-TR-73. PB-287516. Reproductive and Cancer Hazard Assessment Section (RCHAS/<strong>OEHHA</strong>) 1994. Chemicals Known to the State to Cause Cancer or Reproductive Toxicity. Office of Environmental Health Hazard Assessment, California Environmental Protection Agency. Theiss JC, Shimkin MB and Poirer LA. 1979. Induction of pulmonary adenomas in strain A mice by substituted organohalides. Cancer Res 39:391-395. U.S. Environmental Protection Agency 1986. Health and Environmental Effects Profile for Allyl Chloride. EPA 600/X-86/198, NTIS PB88-219399, Environmental Criteria and Assessment Office, Office of Health and Environmental Assessment, Cincinnati, OH 45268. Van Duuren BL, Goldschmidt BM, Loewengart G, Smith AC, Melchionne S, Seldman I and Roth D. 1979. Carcinogenicity of halogenated olefinic and aliphatic hydrocarbons in mice. J Natl Cancer Inst 63:1433-1439. 54
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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
Page 11 and 12: Hot Spots Unit Risk and Cancer Pote
Page 17 and 18: Additional ATES and PETS documents
Page 19 and 20: data. If several data sets (dose an
Page 21 and 22: US EPA Calculation of Carcinogenic
Page 23 and 24: exposure to a concentration of 1 µ
Page 25 and 26: incidences for each of the dose lev
Page 27 and 28: computes the surface area of a sphe
Page 29 and 30: Comparison of Hot Spots Cancer Unit
Page 31 and 32: Gold, L., de Veciana, M., Backman,
Page 33 and 34: Animal Studies Rats Woutersen et al
Page 35 and 36: ased on sufficient evidence of carc
Page 37 and 38: ACETAMIDE CAS No: 60-35-5 I. PHYSIC
Page 39 and 40: Methodology Expedited Proposition 6
Page 41 and 42: cancer mortality. However, US EPA (
Page 43 and 44: Table 2. Lung adenoma incidence in
Page 45 and 46: Table 3 (continued). Acrylamide-ind
Page 47 and 48: Robinson M, Bull RJ, Knutsen GL, Sh
Page 49 and 50: Also, a trend was observed correlat
Page 51 and 52: eported. Cause-specific expected de
Page 53 and 54: Bio/Dynamics Inc. conducted a study
Page 55 and 56: examination. Interim sacrifices wer
Page 57 and 58: Table 8. Tumor incidence in male an
Page 59 and 60: Gaffey WR and Strauss ME. 1981. A m
Page 61: (technical grade; 98% pure) by gava
Page 65 and 66: still alive in the low-dose control
Page 67 and 68: ANILINE CAS No: 62-53-3 I. PHYSICAL
Page 69 and 70: fibrosarcomas, stromal sarcomas, ca
Page 71 and 72: ARSENIC (INORGANIC) CAS No: 7440-38
Page 73 and 74: elationship between arsenic exposur
Page 75 and 76: al. (1988) did not induce lung tumo
Page 77 and 78: A risk assessment was also conducte
Page 79 and 80: Chen C, Chuang Y, You S, Lin T and
Page 81 and 82: Schrauzer G, White D, McGinness J,
Page 83 and 84: Table 1: Summary of epidemiologic s
Page 85 and 86: had at least one animal demonstrati
Page 87 and 88: mesothelioma, recommended lifetime
Page 89 and 90: National Institute for Occupational
Page 91 and 92: BENZENE CAS No: 71-43-2 I. PHYSICAL
Page 93 and 94: Animal Studies Available experiment
Page 95 and 96: Table 3: Summary of NTP bioassay re
Page 97 and 98: Table 4: Summary of benzene low-dos
Page 99 and 100: Maltoni C, Conti B and Cotti G. 198
Page 101 and 102: a benign tumor of the kidney. No ba
Page 103 and 104: al. (1968) found no tumors in lifet
Page 105 and 106: following relationship, where C(t 1
Page 107 and 108: Miakawa M. and Yoshida O. 1975. Pro
Page 109 and 110: human population and that BPDE-DNA
Page 111 and 112: 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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Methodology Expedited Proposition 6
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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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Table 1. Experimental design of 2,4
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Methodology Expedited Proposition 6
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Additional analysis of these data b
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Jackson RJ, Greene CJ, Thomas JT, M
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Table 1. Tumor incidence in rats ex
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Girard R, Tolot F, Martin P and Bou
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exposed more than 16 years before t
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interpretation of dose extrapolatio
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1, 1-DICHLOROETHANE CAS No: 75-34-3
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Table 1b. Study design for carcinog
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National Cancer Institute (NCI) 197
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mice, hepatocellular carcinoma inci
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V. REFERENCES California Department
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DAB/day by gavage for the life of t
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2,4-DINITROTOLUENE CAS No: 121-14-2
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Ellis et al.(1979) (also reported b
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Final Statement of Reasons for OAL,
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to the small sample size and short
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In an inhalation study, Torkelson e
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V. REFERENCES American Conference o
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EPICHLOROHYDRIN CAS No: 106-89-8 I.
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espiratory tumors were noted in the
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Table 4. Epichlorohydrin-induced fo
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Konishi Y, Kawabata A, Denda A, Ike
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exposed to arsenicals for 20 months
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espectively (all statistically sign
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ETHYLENE DICHLORIDE CAS No: 107-06-
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Several factors have been suggested
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myelogenous leukemias (4 and 8 year
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statistically significant. CDHS not
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combined with the incidence in the
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incidence of primary brain tumors.
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Table 6 (continued): Organ/Sex Mali
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An Upper 95% Confidence Limit (UCL)
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ETHYLENE THIOUREA (ETU) CAS No: 96-
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male and female rats. Tumor inciden
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FORMALDEHYDE CAS No: 50-00-0 I. PHY
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presented an extension of a previou
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Methodology In developing a spectru
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Casanova M, Morgan KT, Steinhagen W
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Tobe M, Kaneko T, Uchida Y, Kamata
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Table 1. Hexachlorobenzene-induced
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50 pups (F 1 ) of each sex were ran
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Ertürk E, Lambrecht RW, Peters HA,
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Table 1. Liver hepatoma incidence i
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1988). An airborne unit risk factor
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HYDRAZINE CAS No: 302-01-2 I. PHYSI
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Methodology Inhalation A linearized
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LEAD AND LEAD COMPOUNDS (INORGANIC)
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and other occupational carcinogens
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y inhalation is similar for rats an
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Goyer RA. 1992. Nephrotoxicity and
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LINDANE (g-Hexachlorocyclohexane) C
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Using these relationships, a human
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METHYL TERT-BUTYL ETHER (MTBE) CAS
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Tumor incidences according to the r
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kidney changes indicative of chroni
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Interspecies scaling for oral doses
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Table 4 (continued): Dose Response
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Experimental Pathology Laboratories
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Animal Studies Male and female HaM/
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Gold L, Sawyer C, Magaw R, Backman
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Using the statistical tests (one-ta
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Table 1: Methylene chloride-induced
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Significant treatment-related incre
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National Toxicology Program (NTP) 1
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noted; however, the study duration
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Crump KS, Howe RB, Van Landingham C
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Table 1. Michler’s ketone-induced
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NICKEL AND NICKEL COMPOUNDS CAS No:
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the high exposure group was 14.0. A
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male and 121 female rats, was expos
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2.1 - 2.6 × 10 -4 (µg/m 3 ) -1 .
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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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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
Page 427 and 428:
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
Page 485 and 486:
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
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.
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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
Page 523 and 524:
TOLUENE DIISOCYANATE CAS No: 26471-
Page 525 and 526:
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
Page 535 and 536:
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:
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
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
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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
Page 567 and 568:
Experiment BT1 Most previous risk a
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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
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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
Page 585 and 586:
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
Page 601 and 602:
Page 603 and 604:
Page 605 and 606:
Methyl tert-butyl ether p. 5: Added
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