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Discussion of Results The investigation of the forms of the model using Poisson regression explored the use of categorical covariates, calendar year and age-at-start-of-follow-up that verified the categorical trend with exposure that Garshick et al. (1988) had obtained for relative hazard by using a Cox regression with calendar year as the principal time scale and age-at-start-of-follow-up as a covariate. This result was an elevated relative risk (relative hazard) for the middle durations of exposure and an apparent rise at the highest exposure, albeit with large error bars. Crump (1997) found by direct comparison a close correspondence of results for this Poisson regression and a Cox regression that replicated Garshick et al. The investigation also explored the use of a general model with the categorical covariates, calendar year and attained age, that verified the categorical results for relative risk in Crump et al. (1991) and Crump (1997). This result showed a rise and then an apparent fall of relative risk for increasing exposure. Age and calendar year are important determinants of lung cancer rate, and Crump (1997) has argued that this choice should be used for covariates because it is the most accurate in characterizing background rates and, further, that a fall of relative risk at the higher exposure, obtained for this choice of covariates, is not consistent with an exposure response. It should be kept in mind that the categorical trends of the relative risk with duration of exposure are all used to represent a large cloud of observed points of incidence as a function of duration of exposure. Appendix F of the diesel exhaust TAC document (OEHHA, 1998) indicates that the discrepancy between the results of Garshick et al. and of Crump et al. may be more apparent that real. The slopes for the relative risk are significant for both these choices of covariate, but the slope for the use of calendar year and age-at-start is about twice that for the use of calendar year and attained age. The latter slope is larger, though less significant, than the identical slope obtained in the present analysis using continuous forms of either pair of covariates. The use of the continuous form of the covariates appears to have a salutary effect on reducing the variance of the slope estimate. This choice allows some flexibility, but not a lot, in describing time trends. Conclusion Based on the human data, the principal finding of the diesel exhaust TAC document quantitative risk assessment is a range of lifetime unit risk (95% UCL) as shown in the right-hand column of Table 4 above. The lowest value in the range is 1.3 × 10 -4 , and the highest value is 2.4 × 10 -3 . The geometric mean unit risk obtained from these end points of the range of values is 6 × 10 -4 (lifetime-µg/m 3 ) -1 . The geometric mean provides information on the central tendency of the range and is not to be confused with a best estimate identified from the available calculations. The lower end of the range is the rounded value for both forms of multistage model using the roof exposure pattern for the data of the Garshick et al. (1988) cohort study of U.S. railroad workers. OEHHA concluded that incorporation of the roof exposure pattern and biologically-based analyses improved the unit risk estimates. Consequently, unit risk values incorporating this information, those at the lower end of the range, provide more scientifically defensible values. The upper end of the range is obtained using the published results of the Garshick et al. (1987a) case-control study for US railroad workers. The Scientific Review Panel concluded in 467
their findings that a reasonable estimate of the cancer unit risk is 3 × 10 -4 (µg/m 3 ) -1 . V. REFERENCES Ahlberg J, Ahlbom A, Lipping H, Norrel S and Osterblom L. 1981. Cancer among professional drivers - a problem-oriented register-based study (Swed.). Lakartidningen 78:1545-1546. Ball J, Greene B, Young W, Richert J and Salmeen I. 1990. S9-activated Ames assays of dieselparticle extracts; Detecting indirect-acting mutagens in samples that are direct-acting. Environmental Science and Technology 24:890-894. Bender A, Parker D, Johnson R, Scharber W, Williams A, Marbury M and Mandel J. 1989. Minnesota highway maintenance workers study: cancer mortality. Am J Ind Med 15:545-556. Benhamou S, Benhamou E and Flamant R. 1988. Occupational risk factors of lung cancer in a French case-control study. Br J Ind Med 45:231-233. Bhatia R, Lopipero P and Smith A. 1998. Diesel exhaust exposure and lung cancer. Epidemiology 9:84-91. Boffetta P, Stellman S and Garfinkel L. 1988. Diesel exhaust exposure and mortality among males in the American Cancer Society prospective study. Am J Ind Med 14:403-415. Boffetta P, Harris R and Wynder E. 1990. Case-control study on occupational exposure to diesel exhaust and lung cancer risk. Am J Ind Med 17:577-592. Breslow N and Day N. 1980. Statistical methods in cancer research. Vol. 1. In: The analysis of casecontrol studies. Scientific publication 32. International Agency for Research on Cancer, Lyon, France, pp. 69-73. Breslow N and Day N. 1987. Statistical methods in cancer research. Vol. 2. In: The design and analysis of cohort studies. Scientific publication 82. International Agency for Research on Cancer, Lyon, France, pp. 120-142, 179-181, 211-212. Brightwell J, Foullet S, Fouillet S, Cassano-Zoppi A, Gatz R and Duchosal F. 1986. Neoplastic and functional changes in rodents after chronic inhalation of engine exhaust emissions. In: Carcinogenic and mutagenic effects of diesel engine exhaust. Ishinishi N, Koizumi A, McClellan R and Stöber W, eds. Elsevier Science Publishers, Amsterdam, pp. 471-485. Brightwell J, Fouillet X, Cassano-Zoppo A, Bernstein D, Crawley F, DF, Gatz R, Perczel S and Pfeifer H. 1989. Tumors of the respiratory tract in rats and hamsters following chronic inhalation of engine exhaust emissions. J Appl Toxicol 9:23-31. Buiatti E, Krievel D, Geddes M, Santucci M and Pucci N. 1985. A case-control study of lung cancer in Florence, Italy. I. Occupational risk factors. J Epidemiol Community Health 39:244-250. 468
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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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Table 1. Experimental design of 2,4
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Additional analysis of these data b
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Jackson RJ, Greene CJ, Thomas JT, M
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Table 1. Tumor incidence in rats ex
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Girard R, Tolot F, Martin P and Bou
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exposed more than 16 years before t
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interpretation of dose extrapolatio
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1, 1-DICHLOROETHANE CAS No: 75-34-3
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Table 1b. Study design for carcinog
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National Cancer Institute (NCI) 197
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mice, hepatocellular carcinoma inci
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V. REFERENCES California Department
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DAB/day by gavage for the life of t
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2,4-DINITROTOLUENE CAS No: 121-14-2
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Ellis et al.(1979) (also reported b
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Final Statement of Reasons for OAL,
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to the small sample size and short
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In an inhalation study, Torkelson e
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V. REFERENCES American Conference o
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EPICHLOROHYDRIN CAS No: 106-89-8 I.
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espiratory tumors were noted in the
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Table 4. Epichlorohydrin-induced fo
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Konishi Y, Kawabata A, Denda A, Ike
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exposed to arsenicals for 20 months
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espectively (all statistically sign
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ETHYLENE DICHLORIDE CAS No: 107-06-
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Several factors have been suggested
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myelogenous leukemias (4 and 8 year
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statistically significant. CDHS not
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combined with the incidence in the
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incidence of primary brain tumors.
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Table 6 (continued): Organ/Sex Mali
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An Upper 95% Confidence Limit (UCL)
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ETHYLENE THIOUREA (ETU) CAS No: 96-
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male and female rats. Tumor inciden
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FORMALDEHYDE CAS No: 50-00-0 I. PHY
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presented an extension of a previou
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Methodology In developing a spectru
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Casanova M, Morgan KT, Steinhagen W
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Tobe M, Kaneko T, Uchida Y, Kamata
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Table 1. Hexachlorobenzene-induced
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50 pups (F 1 ) of each sex were ran
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Ertürk E, Lambrecht RW, Peters HA,
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Table 1. Liver hepatoma incidence i
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1988). An airborne unit risk factor
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HYDRAZINE CAS No: 302-01-2 I. PHYSI
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Methodology Inhalation A linearized
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LEAD AND LEAD COMPOUNDS (INORGANIC)
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and other occupational carcinogens
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y inhalation is similar for rats an
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Goyer RA. 1992. Nephrotoxicity and
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LINDANE (g-Hexachlorocyclohexane) C
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Using these relationships, a human
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METHYL TERT-BUTYL ETHER (MTBE) CAS
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Tumor incidences according to the r
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kidney changes indicative of chroni
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Interspecies scaling for oral doses
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Table 4 (continued): Dose Response
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Experimental Pathology Laboratories
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Animal Studies Male and female HaM/
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Gold L, Sawyer C, Magaw R, Backman
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Using the statistical tests (one-ta
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Table 1: Methylene chloride-induced
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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
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
Page 441 and 442: employment (χ 2 test for trend: p
Page 443 and 444: elevated smoking-adjusted risk esti
Page 445 and 446: Table 1 (continued): Reference Miln
Page 447 and 448: Table 1 (continued): Reference Damb
Page 449 and 450: Table 1 (continued): Reference Burn
Page 451 and 452: Table 1 (continued): Reference Raff
Page 453 and 454: Table 1 (continued): Epidemiologica
Page 455 and 456: Table 1 (continued): Epidemiologica
Page 457 and 458: Table 1 (continued): Reference Wegm
Page 459 and 460: Animal Studies Section 6.1 (Animal
Page 461 and 462: The variability, or heterogeneity,
Page 463 and 464: estimate for those studies for whic
Page 465 and 466: Figure 1: Estimates of Relative Ris
Page 467 and 468: q 1 * = Excess relative risk × CA
Page 469 and 470: Table 3: Number of Workers in the E
Page 471 and 472: u nexposed workers at zero concentr
Page 473 and 474: for each µg/m 3 of diesel exhaust
Page 475: Table 4: Values from Unit Risk for
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
Page 487 and 488: 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
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: IV. DERIVATION OF CANCER POTENCY Ba
Page 513 and 514: PROPYLENE OXIDE CAS No: 75-56-9 I.
Page 515 and 516: oxide. In the NTP carcinogenicity s
Page 517 and 518: 1,1,2,2-TETRACHLOROETHANE CAS No: 7
Page 519 and 520: assumed a body weight of 70 kg and
Page 521 and 522: 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
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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.
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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
Page 579 and 580:
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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