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occupational nickel exposure in humans, were determined to be the most appropriate for use in developing a quantitative cancer risk assessment Methodology In the Ottolenghi et al. study, the low survival rate of the nickel subsulfide exposed group was examined. Mortality was about the same during the first year of study between the control and the nickel-exposed group but in the 76 th week when the first tumor was observed, the exposed group had a 6% higher mortality rate (23% vs. 17% for controls). Taking this into account, the subsequent mortality [(0.94 (exposed group mortality) – 0.23) × 208 (animals examined) = 148 animals] in the nickel-exposed group due to tumors was 29/148 or approximately 20%. Based on these assumptions, nearly all of the differences (0.32 – 0.06 = 0.26) in the survival between control animals (32%) and the treated animals (6%) can be explained by lung tumor mortality. The animal data was adjusted for continuous lifetime exposure [(979 µg/m 3 )(6/24 hr)(5/7 day)(78/110) = 122.8 µg/m 3 ]. This was used to calculate the human equivalent exposure level using an inspiration rate of 20 m 3 /day and a 70 kg body weight. The CDHS staff (CDHS, 1991) used a multistage model (GLOBAL86), fitted to adjusted data from this inhalation bioassay to yield a maximum likelihood estimate of carcinogenic potency of 2 × 10 -4 (µg/m 3 ) -1 ) nickel subsulfide (or 28 × 10 -4 (µg Ni/m 3 ) -1 ). The upper 95% confidence limit of the estimated carcinogenic potency is 28 × 10 -4 (µg/m 3 ) -1 nickel subsulfide [or 38 × 10 -4 (µg Ni/m 3 ) -1 ]. The risk quantification was also conducted using epidemiological data from worker studies. The Ontario cohort study (Chovil et al., 1981; Roberts et al., 1984; Muir et al., 1985; ICNCM, 1990) was determined to be the most appropriate for quantitative cancer risk assessment due primarily to the fact that it was the only cohort study with exposure measurements available for a sufficiently early time period. The West Virginia cohort (Enterline and Marsh 1982; ICNCM, 1990) was rejected for use in the quantitative risk assessment due to the imprecision associated with the low SMR reported, which could have been due to confounding factors. The Norwegian cohort (Magnus et al., 1982; Pedersen et al., 1973) was deemed unsuitable for risk assessment due to the absence of nickel exposure data from the refinery. The Welsh cohort (Doll et al., 1977; Peto et al., 1984; Breslow and Day, 1987; Kaldor et al., 1986; ICNCM, 1990) was also not used in the quantitative risk assessment because exposure measurements were not available for a relevant time period. A relative risk model was chosen as the most appropriate method for linear extrapolation to low dose lifetime exposure. The excess risk from nickel exposure among smokers was assumed to be the same as among non-smokers. SMR values were plotted against cumulative exposure, and the slope of the linear regression of the data was 9.22. The 95% confidence limit of the slope was 11.26. This upper limit was corrected to 11.85 for the fraction of the study group lost to follow-up. The exposure was adjusted for an equivalent lifetime exposure [(8 hr/24 hr) × (5 days/7 days) × (48 weeks/52 weeks)]. The excess relative risk estimate for lifetime exposure at 1 mg/m 3 was 5.04. Considering the background lifetime mortality risk of 0.051 for Ontario at the time of the cohort study follow-up, the upper bound for lifetime added risk for exposure to 1 mg/m 3 was 2.57 × 10 -1 (or 2.57 × 10 -4 (µg/m 3 ) -1 ). The average of the unit risk is 2.1 × 10 -4 (µg/m 3 ) -1 (257 × 9.22/11.26) using the actual SMR rather the upper confidence limit. Therefore, based on the human studies the range of unit risk is approximately 381
2.1 - 2.6 × 10 -4 (µg/m 3 ) -1 . Using the human and animal data, the range of cancer risks is from 2.1 to 37 × 10 -4 (µg/m 3 ) -1 . The best value chosen for the upper bound of risk was 2.6 × 10 -4 (µg/m 3 ) -1 , derived from the human lung cancer incidence data. CDHS (1991) noted that the epidemiological studies indicate both soluble and insoluble nickel compounds are carcinogenic. However, the available epidemiologic data were inadequate to develop separate unit risk factors for different nickel compounds. V. REFERENCES Breslow NE and Day NE. 1987. The Design and Analysis of Cohort Studies. Vol. II. IARC Scientific Publications No. 82. International Agency for Research on Cancer, Lyon, France. California Department of Health Services (CDHS) 1991. Health Risk Assessment for Nickel. Berkeley, CA. Chovil A, Sutherland RB and Halliday M. 1981. Respiratory cancer in a cohort of nickel sinter plant workers. Br J Ind Med 38:327-333. Doll R, Matthews JD and Morgan LG. 1977. Cancers of the lung and nasal sinuses in nickel workers: a reassessment of the period of risk. Br J Ind Med 34:102-105. Enterline PE and Marsh GM. 1982. Mortality among workers in a nickel refinery and alloy manufacturing plant in West Virginia. J Natl Cancer Inst 68:925-933. Glaser U, Hochrainer D, Oldiges H and Takenaka S. 1986. Long-term inhalation studies with NiO and As 2 O 3 aerosols in Wistar rats. Int Congr Ser Exerpta Med 676:325-328. Hazardous Substance Data Bank (HSDB) (Internet version) 1998. National Library of Medicine, Bethesda MD. Horie A, Haratake J, Tanaka I, Kodama Y and Tsuchiya K. 1985. Electron microscopical findings with special references to cancer in rats caused by inhalation of nickel oxide. Biol Trace Elem Res 7:223- 239. Hueper WC and Payne WW. 1962. Experimental studies in metal carcinogenesis: chromium, nickel, iron, and arsenic. Arch Environ Health 5:445-462. International Committee on Nickel Carcinogenesis in Man (ICNCM). 1974. Report of the International Committee on Nickel Carcinogenesis in Man. Scand J Wrk Environ Health 16:1-84. Kaldor J, Peto J, Easton D, Doll R, Hermon C and Morgan L. 1986. Models for respiratory cancer in nickel refinery workers. J Natl Cancer Inst 77:841-848. 382
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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
Page 339 and 340: HYDRAZINE CAS No: 302-01-2 I. PHYSI
Page 341 and 342: Methodology Inhalation A linearized
Page 343 and 344: LEAD AND LEAD COMPOUNDS (INORGANIC)
Page 345 and 346: and other occupational carcinogens
Page 347 and 348: y inhalation is similar for rats an
Page 349 and 350: Goyer RA. 1992. Nephrotoxicity and
Page 351 and 352: LINDANE (g-Hexachlorocyclohexane) C
Page 353 and 354: Using these relationships, a human
Page 355 and 356: METHYL TERT-BUTYL ETHER (MTBE) CAS
Page 357 and 358: Tumor incidences according to the r
Page 359 and 360: kidney changes indicative of chroni
Page 361 and 362: Interspecies scaling for oral doses
Page 363 and 364: Table 4 (continued): Dose Response
Page 365 and 366: Experimental Pathology Laboratories
Page 367 and 368: Animal Studies Male and female HaM/
Page 369 and 370: Gold L, Sawyer C, Magaw R, Backman
Page 371 and 372: Using the statistical tests (one-ta
Page 373 and 374: Table 1: Methylene chloride-induced
Page 375 and 376: Significant treatment-related incre
Page 377 and 378: National Toxicology Program (NTP) 1
Page 379 and 380: noted; however, the study duration
Page 381 and 382: Crump KS, Howe RB, Van Landingham C
Page 383 and 384: Table 1. Michler’s ketone-induced
Page 385 and 386: NICKEL AND NICKEL COMPOUNDS CAS No:
Page 387 and 388: the high exposure group was 14.0. A
Page 389: male and 121 female rats, was expos
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
Page 413 and 414: ationale for selection of the OEHHA
Page 415 and 416: A unit risk value based upon air co
Page 417 and 418: N-NITROSODIPHENYLAMINE CAS No: 86-3
Page 419 and 420: Methodology Dosage estimates of NDP
Page 421 and 422: Crump KS, Howe RB. 1984. The multis
Page 423 and 424: Table 1. P-Nitrosodiphenylamine-ind
Page 425 and 426: N-NITROSOMORPHOLINE CAS No: 59-89-2
Page 427 and 428: IV. DERIVATION OF CANCER POTENCY Ba
Page 429 and 430: N-NITROSOPIPERIDINE CAS No: 100-75-
Page 431 and 432: Table 3. N-Nitrosopiperidine-induce
Page 433 and 434: Crump KS, Howe RB, Van Landingham C
Page 435 and 436: testicular tumors were noted in the
Page 437 and 438: PARTICULATE MATTER FROM DIESEL-FUEL
Page 439 and 440: etired railroad workers who had had
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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
Page 481 and 482:
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
Page 499 and 500:
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
Page 505 and 506:
National Toxicology Program 1993. T
Page 507 and 508:
Table 1. Potassium bromate-induced
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1,3-PROPANE SULTONE CAS No: 1120-71
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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
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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
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
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Page 603 and 604:
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Methyl tert-butyl ether p. 5: Added
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