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Mirvish SS, Chen L, Haran-Guera N and Berenblum I. 1969. Comparative study of lung carcinogenesis, promoting action in leukemogenesis and initiating action in skin tumorigenesis by urethane, hydrazine, and related compounds. Int J Cancer 4:318-326. Roe FJC. 1978. Hydrazine. Ann Occup Hyg 21:323-326. U.S. Environmental Protection Agency 1988. Evaluation of the Potential Carcinogenicity of Hydrazine (301-01-2). EPA/600/8-91/141, Carcinogen Assessment Group, Office of Health and Environmental Assessment, Washington, DC. U.S. Environmental Protection Agency 1991. Integrated Risk Assessment System: Hydrazine/Hydrazine Sulfate. Office of Health and Environmental Assessment, Washington, DC. Wald N, Boreham J, Doll R and Bonsall J. 1984. Occupational exposure to hydrazine and subsequent risk of cancer. Br J Ind Med 41:31-41. 333
LEAD AND LEAD COMPOUNDS (INORGANIC) CAS No.: 7439-92-1 I. PHYSICAL AND CHEMICAL PROPERTIES Molecular weight 207.2 (Budavari, 1989) Boiling point 1740 o C (Budavari, 1989) Melting point 327.4 o C (Budavari, 1989) Vapor pressure 1.77 mm Hg at 1000 o C (Budavari, 1989) Air concentration conversion not available II. HEALTH ASSESSMENT VALUES Unit Risk Factor: 1.2 E-5 (µg/m 3 ) -1 Slope Factor: (inhalation) 4.2 E-2 (mg/kg-day) -1 (oral) 8.5 E-3 (mg/kg-day) -1 [Calculated by <strong>OEHHA</strong> (1997) from rat kidney tumor incidence data (Azar et al., 1973) using a linearized multistage procedure.] III. CARCINOGENIC EFFECTS Human Studies Epidemiological studies and case reports of people occupationally exposed to lead provide some evidence of carcinogenicity but are not convincing due to lack of controlling for confounders such as smoking and to the simultaneous exposure of some workers to known human carcinogens including arsenic and cadmium. These studies have been reviewed by several agencies (IARC, 1980; U.S. EPA, 1986; 1989a; 1989b; A<strong>TSD</strong>R, 1990). The epidemiologic study by Selevan et al. (1985) suggested that human cancer may be induced in the same organ in which cancer is induced in animals. A cohort of 1,987 lead smelter workers was studied. The study confirmed previous reports of occupationally-induced, chronic, fatal renal disease after long term exposure to lead and yielded a Standardized Mortality Ratio (SMR) of 204 for kidney cancer, but the numbers were small (6 cases observed) and the SMR for kidney cancer was not statistically significant. Recently the study has been updated to include 11 years of follow-up and 363 additional deaths (Steenland et al., 1992). No additional deaths from nonmalignant kidney disease had occurred but 3 additional deaths from kidney cancer had occurred. The updated SMR from kidney cancer was 193 (9 total kidney cancer deaths, 95% confidence interval (CI = 0.88, 3.67), i.e., not statistically significant at the 5% level). The SMR for kidney cancer for those with the highest lead exposure was statistically significant (SMR = 239 based on 8 cancers, 95% CI = 1.03, 4.71). The study suffers from lack of 334
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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
Page 291 and 292: Konishi Y, Kawabata A, Denda A, Ike
Page 293 and 294: exposed to arsenicals for 20 months
Page 295 and 296: espectively (all statistically sign
Page 297 and 298: ETHYLENE DICHLORIDE CAS No: 107-06-
Page 299 and 300: Several factors have been suggested
Page 301 and 302: U.S. Environmental Protection Agenc
Page 303 and 304: myelogenous leukemias (4 and 8 year
Page 305 and 306: statistically significant. CDHS not
Page 307 and 308: combined with the incidence in the
Page 309 and 310: incidence of primary brain tumors.
Page 311 and 312: Table 6 (continued): Organ/Sex Mali
Page 313 and 314: An Upper 95% Confidence Limit (UCL)
Page 315 and 316: ETHYLENE THIOUREA (ETU) CAS No: 96-
Page 317 and 318: male and female rats. Tumor inciden
Page 319 and 320: FORMALDEHYDE CAS No: 50-00-0 I. PHY
Page 321 and 322: presented an extension of a previou
Page 323 and 324: Methodology In developing a spectru
Page 325 and 326: Casanova M, Morgan KT, Steinhagen W
Page 327 and 328: Tobe M, Kaneko T, Uchida Y, Kamata
Page 329 and 330: Table 1. Hexachlorobenzene-induced
Page 331 and 332: 50 pups (F 1 ) of each sex were ran
Page 333 and 334: Ertürk E, Lambrecht RW, Peters HA,
Page 335 and 336: Table 1. Liver hepatoma incidence i
Page 337 and 338: 1988). An airborne unit risk factor
Page 339 and 340: HYDRAZINE CAS No: 302-01-2 I. PHYSI
Page 341: Methodology Inhalation A linearized
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 and 390: male and 121 female rats, was expos
Page 391 and 392: 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
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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
Page 479 and 480:
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
Page 495 and 496:
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
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
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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
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
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:
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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
Page 555 and 556:
Crouch E. 1983. Uncertainties in in
Page 557 and 558:
VINYL CHLORIDE CAS No: 75-01-4 I. P
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Table 1 (continued): A Summary of E
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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
Page 569 and 570:
No statistical analyses of mortalit
Page 571 and 572:
Table 11 gives unit risk estimates
Page 573 and 574:
Bertazzi PA, Villa A, Foa V, Saia B
Page 575 and 576:
Nicholson WJ, Hammond EC, Seidman H
Page 577 and 578:
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
Page 589 and 590:
Group 4: The agent is probably not
Page 591 and 592:
TECHNICAL SUPPORT DOCUMENT FOR DESC
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US EPA IRIS Inhalation Unit Risk an
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TECHNICAL SUPPORT DOCUMENT FOR DESC
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as appropriate, and revise IRIS fil
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Chemical Exposure Route Study Type
Page 601 and 602:
Page 603 and 604:
Page 605 and 606:
Methyl tert-butyl ether p. 5: Added
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