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Logo of nihpaAbout Author manuscriptsSubmit a manuscriptHHS Public Access; Author Manuscript; Accepted for publication in peer reviewed journal;
Int J Occup Environ Health. Author manuscript; available in PMC 2012 May 30.
Published in final edited form as:
PMCID: PMC3363002

Benzene-induced Cancers: Abridged History and Occupational Health Impact


Benzene-induced cancer in humans was first reported in the late 1920s. Carcinogenesis findings in animals were not reported conclusively until 1979. Industry exploited this “discrepancy” to discredit the use of animal bioassays as surrogates for human exposure experience. The cardinal reason for the delay between first recognizing leukemia in humans and sought-after neoplasia in animals centers on poor design and conduct of experimental studies. The first evidence of carcinogenicity in animals manifested as malignant tumors of the zymbal glands (sebaceous glands in the ear canal) of rats, and industry attempted to discount this as being irrelevant to humans, as this organ is vestigial and not present per se in humans. Nonetheless, shortly thereafter benzene was shown to be carcinogenic to multiple organ sites in both sexes of multiple strains and multiple species of laboratory animals exposed via various routes. This paper presents a condensed history of the benzene bioassay story with mention of benzene-associated human cancers.

Keywords: benzene, carcinogenicity, industry influence, history, bioassay, public health, occupational safety, primary prevention

Further to Peter Infante’s excellent investigative exposé of the truth behind some of the benzene industry’s malpractices and abuses (e.g., withholding incriminating data) and resultant OSHA standard-setting issues,1 there were similar shenanigans surrounding the experimental findings from benzene-exposed animals. Following a series of early, albeit patently inadequate, bioassay experiments on benzene—too few animals, lack of control animals, low and short-term exposures, incomplete pathology often looking only for leukemias2—the more modern animal bioassay data clearly confirm and extend the possible cancer hazards of worker and consumer exposures to benzene. To complement the feature by Infante,1 a brief history of benzene bioassays is given, accompanied by mention of human cancer findings.


Experimental chemical carcinogenesis bioassays are designed and carried out to identify potential carcinogenic hazards and likely effects for humans.3 Carcinogenesis results in rodents—mainly rats and mice—have been shown to be consistent and reliable indicators of human cancer risks. All known human carcinogens that have been evaluated in animal bioassays are also correlatively carcinogenic. Further, of the nearly 100 recognized human carcinogens, about one third were shown first to be carcinogenic in experimental animals and subsequently in humans.4 Hence, for chemicals discovered to be carcinogenic to laboratory animals, prudent public health policy suggests strongly that eliminating or minimizing exposures to these carcinogens would reduce environmentally and in particular occupationally associated cancers. Today, this primary prevention strategy serves unfortunately only as a dim beacon of better times when the health of workers was more prominent than profit. This has evolved into what is now referred to as the precautionary principle,79 which poses to act earlier in the available albeit scanty data stream to initiate health safety strategies and proactive occupational and public health measures, despite possible scientific uncertainties.10


Over the years, the International Agency for Research on Cancer (IARC) has evaluated benzene on three occasions: 1974,11 1982,12 and 1987.13 In 1974,11 the IARC decided “The data reported do not permit the conclusion that carcinogenic activity has been demonstrated” based on “Benzene has been tested only in mice by subcutaneous injection and skin application.” Regarding human carcinogenicity data, IARC noted “It is established that exposure to commercial benzene or benzene-containing mixtures may result in damage to the haematopoietic system. A relationship between such exposure and the development of leukaemia is suggested by many case reports, and this suggestion is strengthened by a case–control study from Japan.”

In 198212 IARC evaluated benzene as having “sufficient evidence that benzene is carcinogenic to man,” but the available animal data on benzene as only “limited evidence of carcinogenicity in experimental animals.” This animal-data conclusion was based on:

Benzene has been tested in rats by intragastric administration and inhalation exposure, and in mice by skin application, inhalation exposure and subcutaneous injection. Oral administration to rats resulted in an increase in the incidence of Zymbal-gland carcinomas. Anaemia, lymphocytopenia and bone-marrow hyperplasia and an increased incidence of lymphoid tumours occurred in male mice exposed by inhalation to benzene; in similar inhalation studies with another strain of mice and with rats there was no evidence of a leukaemic response. Experiments involving skin application or subcutaneous injection of benzene did not produce evidence of carcinogenicity, but most of these experiments were inadequate.

The last time IARC evaluated benzene was in 1987,13 with evidence of carcinogenicity considered sufficient both for humans and for animals. In humans the evidence was based on increases in leukemia in benzene workers.14,15 In animals, according to IARC

Benzene was tested for carcinogenicity in mice and rats by several routes of administration. Following its oral administration at several dose levels, it induced neoplasms at multiple sites in males and females of both species. After mice were exposed to benzene by inhalation, a tendency towards induction of lymphoid neoplasms was observed. Exposure of rats by inhalation increased the incidence of neoplasms, mainly carcinomas, at various sites. Skin application or subcutaneous injection of benzene to mice did not produce evidence of carcinogenicity, but most of the experiments were inadequate for evaluation. In a mouse-lung tumour bioassay by intraperitoneal injection, an increase in the incidence of lung adenomas was observed in males.

Since the 1987 IARC evaluation, more confirmatory epidemiologic information has become available,16,17 with multiple myeloma,18 lung cancer, and non-Hodgkin’s lymphoma1923 now clearly attributable to benzene exposures. Risks of acute myeloid leukemia and other malignant and nonmalignant hematopoietic disorders associated with benzene exposure in China are consistent with known benzene exposures, hematotoxicity, and cancer risks, extending evidence for hematopoietic cancer risks to levels substantially lower than previously established.24 From global public health and occupational perspectives, perhaps IARC should consider updating its 20-year-old benzene and cancer evaluation. Granted the human and animal data are considered already to be at the highest level of concern, new cancer sites have been discovered and the carcinogenesis correlations between animals and humans are mechanistically worth re-examining.


From his early cocarcinogenicity studies of croton oil on rabbit skin25 and DMBA on hamster skin,26 through seminal bioassays of vinyl chloride,2729 gasoline products,30,31 including benzene and MTBE,32,33 and formaldehyde,34 up to consumer chemicals such as ethyl alcohol,35 one can justifiably track the early history of chemical carcinogenesis by following Cesare Maltoni and his colleagues’ dedicated work on identifying occupational carcinogens3638 for developing public health and occupational standards and polices of primary prevention of human cancers.39


Following Maltoni and his colleagues’ seminal finding of the carcinogenicity of benzene to laboratory animals in 1979,40 they and others more definitively elucidated the carcinogenesis of benzene in a series of papers4147 using their unique bioassay exposure design with various experimental protocols.3638

Near the beginning of Maltoni’s efforts evaluating benzene for carcinogenesis in animals the National Toxicology Program,3,4855 created by David Rall,56,57 also embarked on unraveling the enigma of why benzene appeared to be an exception (along with arsenic5864) to the mammalian carcinogen paradigm2,6567; that is, a chemical known to cause cancer in humans had not been found to do so similarly in animals.* In this vein, I remember being contacted persistently by industry to learn of early results of our bioassays on benzene. This was a bit amusing, because we already knew that benzene caused cancers (leukemias) in humans, and I wondered why the concentrated interest of industry in our animal findings. Calls came at least weekly from the chemical and petroleum industries. Finally one frequent caller told me that if the bioassays were negative then the industry would have some mammalian biologic means to better challenge the human epidemiologic findings, which industry was already confronting. If our bioassay were clearly negative this would help bolster their argument that other chemical exposures and workplace circumstances (confounders) would lend credence to their benzene-is-not-the-culprit rationale. In keeping with the NTP’s open policy I responded with new pathology information as it came available, reminding the inquisitors that until the data were peer-reviewed in public session, our findings could only be considered preliminary. When our pancarcinogenesis findings confirmed and complemented Maltoni’s, industry was seemingly taken aback, and momentarily puzzled regarding their next strategy.6870

Carcinogenesis results of 21 mutually tested chemicals including benzene were compared between the Ramazzini Foundation and the NTP, finding remarkable concordance of overall results, and identifying a combined total of 13 target sites of benzene-induced carcinogenesis in animals67 (Table 1).

Benzene: Organ/Tissue site Tumors Identified in Studies from the Ramazzini Foundation and the National Toxicology Program* in Seven Experiments Using Three Strains of Rats and Three Strains of Mice

In 1928, Delore and Borgomano78 reported the first human case of leukemia associated with benzene exposure.2,65,78 Prior to 1928, of course, benzene was known to cause “benzene poisoning,” a sequela typically involving bone marrow damage. Chronic benzene poisoning among workers leads to various blood disorders such as leukopenia, agranulocytosis, anemia, pancytopenia, aplastic anemia, myelodysplastic syndrome (MDS; preleukemia), and leukemias.24,7981 More recently, occupational exposures to benzene have been causatively linked with multiple myeloma,18 non-Hodgkin’s lymphoma,23 acute82,83 and chronic8487 lymphocytic leukemia, chronic myelogenous leukemia,82,83 and at lower exposures,24,84,87 with some indications for lung cancer.1921 All of these and additional target sites have been identified in animals as well.2,47,65,67 Another prime use of chemical carcinogenesis results allows the identification of other potential presumptive target sites that may be added to or looked for distinctly in epidemiologic investigations.

Speculatively, perhaps other sites of human carcinogenicity have not been either looked for or seen in benzene-exposed workers because death from leukemia is relatively rapid after onset and diagnosis. This could also be because available benzene cohorts individually have been small, except for the one in China. Humans showing the later-aged or latency-occurring lung cancers likely escaped developing leukemias.13,16,1921 This concept of competing risks of cancer is shown experimentally quite nicely with the potent carcinogen 1,3-butadiene: as exposure concentrations are lowered different tumor patterns become manifest.88,89 As with benzene or other chemicals, early lethal tumors such as lymphocytic lymphomas or leukemias often reduce the number of animals at risk for expressing later-developing and -occurring neoplasms at other sites. The same, of course, pertains to humans exposed to different exposure levels, patterns, and durations.

Before, at, and subsequent to Maltoni’s first reports of clear evidence of benzene carcinogenicity in laboratory animals (and arsenic as mentioned above), intense industry propaganda and pressure attempted to discount long-term animal bioassays as being irrelevant to human risk identification; this strategy certainly had much to do with stifling evidence of benzene carcinogenicity, and extended to many other economically important chemicals showing positive cancer findings in animals as well.3,69 For some years before the benzene issue, industry and others had mounted a strenuous effort to dismiss the value of bioassays in a concerted global attempt to continue unabated marketing and use of chemicals shown to cause cancers in laboratory animals, and not yet examined epidemiologically.90

To justify its basic premise, industry seized and campaigned on the then-notion that arsenic and benzene were both considered to be carcinogenic to humans and yet had not been shown to cause cancer in laboratory animals. Now that these two temporarily, albeit historically non-concordant chemicals have been tested adequately in animals and shown to be classic and multifarious carcinogens (benzene2,47,65,67; arsenic5764), this once-dynamic duo touted by industry for vested purposes no longer serves its needs (see footnote on page 214). Now industry uses other arguments such as those based on threshold differences,91 “non-genotoxic” carcinogens,92,93 mechanisms or “modes-of-action” being unique to animals and not relevant to humans,91100 even hormesis,101,102 cell proliferation,92,192–109 inflammation and general toxicity,110112 hormonal mediation,113115 mouse liver tumors,116 and benign tumors,117 to name a few obfuscatory issues industry has latched onto to cloud bioassay results and impede or derail regulatory actions.

Additionally, Maltoni’s first findings of benzene cancer induction in animals40,41 were heavily disputed by industry because the organ affected by cancer was the zymbal gland (located in the inner ear canal), which humans have as a vestige. This issue of zymbal glands has been addressed and debunked, along with other so-called “rodent-unique” organs susceptible to benzene-induced carcinogenesis.118 Fortunately, this issue became moot given the plethora of tumors and tumor types and organ sites seen in the benzene studies. The other issue making the benzene-is-safe argument less tenable, as with arsenic, was that benzene was already long known to be carcinogenic to humans. If this had not been the case, the battle for more stringent and better worker protection and reduction of occupational standards for acceptable exposure levels would have been even more difficult. As it was, lowering of the occupation exposure standard took ten years longer than anticipated because of adverse decisions issued by the U.S. Supreme Court.119

We witness this animal-only argument every single time a chemical of some economic importance is found to cause cancer in laboratory animals in the absence of epidemiologic data. What we never encounter is industry’s questioning or disputing the many “negative” bioassay results on big-volume chemicals.


Mammalian metabolism of benzene is complex, with multiple pathways and diverse metabolites. Despite abundant research, neither the most active carcinogenic metabolite(s) nor a detailed well-accepted mechanism(s) of carcinogenicity of benzene is known with even a modicum of certainty.2,120,121 Tsutsui et al.,120 for example, studied benzene- and key metabolite-induced cell transformation, gene mutations, chromosome aberrations, aneuploidy, sister chromatid exchanges, and unscheduled DNA synthesis in Syrian hamster embryo cells. They found an array of effects for these endpoints but no one metabolite of benzene consistently drove the results. Another way to shed light on those is to investigate carcinogenicity of individual metabolites. Fortunately, several of the most abundant or long-lasting metabolites (or those that could be gotten in sufficient quantity) have been tested for carcinogenic activity: catechol, hydroquinone, and phenol. The designs and findings for these carcinogenicity studies are summarized.


Naturally occurring in fruits and vegetables, present in cigarette smoke, and an industrial chemical, catechol is used to make insecticides, perfumes, drugs, and polymerization inhibitors. Catechol has been used as an antiseptic, in photography, and in dyestuffs.

Catechol has been shown to have strong promoting activity in mice, and alone induces forestomach hyperplasia, generally a few papillomas of the forestomach (non-glandular), and adenomatous hyperplasia and adenocarcinomas of the glandular stomach in near all rats.122126 Administered with known carcinogens, catechol typically increased the occurrence of initiator-targeted tumors of the forestomach and stomach, tongue, and esophagus, but did not enhance their occurrence in liver, urinary bladder, or thyroid.122126 Thus, catechol exhibited strong cancer-promotion activity.


Used an antioxidant in the rubber industry, as a developing agent in photography, and as an intermediate in the manufacture of rubber and food antioxidants and monomer inhibitors, hydro-quinone products are also used as depigmenting agents to lighten skin. Hydroquinone in deionized water was given by gavage for two years to groups of rats and mice of each sex, five days per week at 0, 25 (rats), 50, or 100 (mice) mg/kg.127,128 Nephropathy was common among the rats, with hyperplasia of the renal pelvic transitional epithelium and renal cortical cysts increased in male rats. In mice, thyroid follicular cell hyperplasia was increased (males: 9% vs 28% and 35%; females: 24% vs 85% and 82%). Increases of anisokaryosis, multinucleated hepatocytes, and basophilic foci occurred in the livers of male mice.127,128

Regarding carcinogenic responses, renal tubular cell hyperplasia was seen in two top-dose male rats, with dose-related increases in renal tubular cell adenomas in 0% vs 7% and 15%. Mononuclear cell leukemia in female rats was increased: 16% vs 27% and 40%. In low-dose male mice liver tumors were marginally elevated: 36% vs 54% & 45%, whereas in female mice liver tumors were intensified in both hydroquinone groups: 5% vs 29% and 24%.127,128

Hydroquinone made available to rats and mice of both sexes at 0.8% in the diet for two years induced renal tubular cell hyperplasia as well as adenomas, mainly in males of both species, and was associated with chronic nephropathy in rats.129 Also, epithelial hyperplasia of renal papilla was increased in male rats. Hepatocellular adenoma was enhanced in male mice. Squamous-cell hyperplasia of the forestomach epithelium was higher in mice of both sexes given hydroquinone, but no increase in tumor development was observed.129

Thus, hydroquinone caused kidney tumors in male (and possibly in female) rats and mice, leukemia in female rats, thyroid follicular cell hyperplasia in mice, and liver tumors in male and female mice.127130 Overall, there is clear evidence that hydroquinone causes cancer in laboratory animals.


Approximately 90% of phenol is used in the manufacture of phenolic (phenol formaldehyde) resins, caprolactam, bisphenol A, alkyl phenol, and adipic acid. The remainder is used to produce an assortment of products: salicylic acid, phenacetin, dyes, metal cleaners, disinfectants, antiseptics, photographic chemicals, wood preservatives (pentachlorophenol), paints, paint and varnish removers, and agricultural chemicals (2,4-D and parathion).131

For two years rats and mice of each sex were given drinking water containing 0, 2,500, or 5,000 ppm phenol. The only carcinogenic response was increases in leukemia, 36% vs 62% and 50%, that may have been associated with the phenol administration.131,132 Even though the NTP considered an association with administration of phenol was not established, the incidences in both exposure groups were greater than in controls and the low dose showed a statistically significant effect. No other carcinogenic response was observed in rats or mice. Other low dose increases in male rats included C-cell tumors of the thyroid (8% vs 14% and 2%), adrenal gland pheochromocytomas (26% vs 44% and 18%), and interstitial-cell tumors of the testes (88% vs 98% and 94%).131,132

In other studies, phenol given orally with benzo(a)-pyrene produced sixfold increases in malignant tumors of the forestomach over BaP given alone.112 Phenol also promoted mouse skin carcinogenesis in two-stage protocols.133

Scientific evidence indicates that multiple mechanisms are likely to contribute to benzene-induced leukemias and cancers in other target organs; whether these include individual or co-mechanisms for the individual metabolites remains to be ascertained. (Reasonably straightforwardly, this of course tends to represent universal thinking in chemical carcinogenesis, and leads to the notion that unique chemicals or classes of chemicals induce cancers by “different” mechanisms.) Increasing information lends further credence that metabolites of benzene are primarily responsible for its carcinogenic activity.2,120,121,134137 Phenol, hydroquinone, and catechol are the major metabolites of benzene in mammals, established in analyses of human urine,135 and have been tested for long-term carcinogenicity. Phenol, to a lesser extent, and hydroquinone are associated individually with inducing leukemia in animals, and we might opine in humans as well. One wonders what would be the result(s) if the two chemicals were tested together; that is, whether these findings would be more or less potent than those for benzene or either of these metabolites alone. Catechol causes forestomach and stomach tumors in animals, whereas benzene causes forestomach tumors but does not cause stomach tumors. Some of the other carcinogenic effects of benzene may be due to combinations of the metabolites or to others not yet evaluated for carcinogenic activity.

At the same time, carcinogenic concordance in target sites between animals and humans need not be sacrosanct. Typically in animals there are more tumor sites identified simply because more pathology is done on animals than on humans. One suspects that if all organs were evaluated in humans when people died of “old age” or with cancers other organs would be found to be neoplastic as well. Meanwhile, epidemiology might best broaden the organ scope for future studies.


The clear findings of cancers in animals resulting from exposures to benzene (and to arsenic), and to all other known human carcinogens that have been tested in animals, confirm and validate once again the value of long-term animal bioassays for identifying potential cancer risks to humans.3,5,6777,138173 Virtual acknowledgement of this led industry to new strategies to deny bioassay results: posing that mechanisms (or “modes of action”) of carcinogenesis in animals are unique and hence not relevant to humans. Interestingly most of these claims are based on supposition and not data regarding either the exact mechanism in animals or the lack thereof in humans. A key to reducing damage from all carcinogens, whether identified in animals or in humans or in both mammalian species, centers on reducing exposures.


The author thanks Peter Infante and Rick Irwin for reviewing and offering valuable comments on this paper, and extends appreciation to Joe LaDou and Sandy Lovegrove for all their crucial help and understanding.


*Both of these “exceptions” have been appropriately debunked, solidifying the inexorable correlation that all known human carcinogens that have been tested in laboratory animals are likewise carcinogenic.3,7177


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61. Huff J, Chan P, Nyska A. Is the human carcinogen arsenic carcinogenic to laboratory animals? Toxicol Sci. 2000;55:17–23. [PubMed]
62. Waalkes MP, Ward JM, Liu J, Diwan BA. Transplacental carcinogenicity of inorganic arsenic in the drinking water: induction of hepatic, ovarian, pulmonary, and adrenal tumors in mice. Toxicol Appl Pharmacol. 2003;186:7–17. [PubMed]
63. Waalkes MP, Ward JM, Diwan BA. Induction of tumors of the liver, lung, ovary and adrenal in adult mice after brief maternal gestational exposure to inorganic arsenic: promotional effects of postnatal phorbol ester exposure on hepatic and pulmonary, but not dermal cancers. Carcinogenesis. 2004;25:133–41. [PubMed]
64. Waalkes MP, Liu J, Ward JM, Diwan BA. Mechanisms underlying arsenic carcinogenesis: hypersensitivity of mice exposed to inorganic arsenic during gestation. Toxicology. 2004;198:31–8. [PubMed]
65. Huff J. National Toxicology Program. NTP Toxicology and Carcinogenesis Studies of Benzene (CAS No. 71-43-2) in F344/N Rats and B6C3F1 Mice (Gavage Studies) Natl Toxicol Program Tech Rep Ser. 1986;289:1–277. [PubMed]
66. Huff J, Eastin W, Roycroft J, Eustis SL, Haseman JK. Carcino-genesis studies of benzene, methyl benzene, and dimethyl benzenes. Ann NY Acad Sci. 1988;534:427–40. [PubMed]
67. Huff J. Chemicals studied and evaluated in long-term carcino-genesis bioassays by both the Ramazzini Foundation and the National Toxicology Program: in tribute to Cesare Maltoni and David Rall. Ann NY Acad Sci. 2002;982:208–30. [PubMed]
68. Breilh J, Jefer C Branco, Castelman BI, et al. Texaco and its consultants. Int J Occup Environ Health. 2005;11:217–20. [PubMed]
69. Huff J. Industry influence on occupational and environmental public health. Int J Occup Environ Health. 2007;13:107–17. [PubMed]
70. Bailar JC., 3rd How to distort the scientific record without actually lying: truth, and the arts of science. Eur J Oncol. 2006;11:217–24.
71. Tomatis L, Aitio A, Wilbourn J, Shuker L. Human carcinogens so far identified. Jpn J Cancer Res. 1989;80:795–807. [PubMed]
72. Huff J. Chemicals causally associated with cancers in humans and in laboratory animals: a perfect concordance. In: Waalkes MP, Ward JM, editors. Carcinogen-esis. Raven Press; New York: 1994. pp. 25–37. Chapter 2.
73. Huff J. Chemically associated respiratory carcinogenesis in rodents and in humans. In: Waalkes MP, Ward JM, editors. Carcinogenesis. Raven Press; New York: 1994. pp. 199–214. Chapter 7.
74. Huff J. Animal and human carcinogens. Environ Health Perspect. 1999;107:A341–2. [PMC free article] [PubMed]
75. Tomatis L, Huff J, Hertz-Picciotto I, et al. Avoided and avoidable risks of cancer. Carcinogenesis. 1997;18:97–105. [PubMed]
76. Tomatis L. The identification of human carcinogens and primary prevention of cancer. Mutat Res. 2000;462:407–21. [PubMed]
77. Tomatis L, Melnick RL, Haseman J, Barrett JC, Huff J. Alleged misconceptions’ distort perceptions of environmental cancer risks. FASEB J. 2001;15:195–203. [PubMed]
78. Delore P, Borgomano C. Leucemie aique au cours de l’intoxication benzenique. Sur l’origine toxique de certaines leucemies aigues et leurs relations avec les anemies graves. J Med Lyon. 1928;9:227–33. [In French]
79. Li G, Yin S. Progress of epidemiological and molecular epidemiological studies on benzene in China. Ann NY Acad Sci. 2006;1076:800–9. [PubMed]
80. Kuang S, Liang W. Clinical analysis of 43 cases of chronic benzene poisoning. Chem Biol Interact. 2005;153-154:129–35. [PubMed]
81. Landrigan PJ. Benzene and blood: one hundred years of evidence. Am J Ind Med. 1996;29:225–6. [PubMed]
82. Shu XO, Gao YT, Brinton LA, et al. A population-based case–control study of childhood leukemia in Shanghai. Cancer. 1988;62:635–44. [PubMed]
83. Adegoke OJ, Blair A, Shu XO, et al. Occupational history and exposure and the risk of adult leukemia in Shanghai. Ann Epidemiol. 2003;13:485–94. [PubMed]
84. Glass DC, Gray CN, Jolley DJ, et al. Leukemia risk associated with low-level benzene exposure. Epidemiology. 2003;14:569–77. [PubMed]
85. Glass DC, Gray CN, Jolley DJ, Gibbons C, Sim MR. The health watch case–control study of leukemia and benzene: the story so far. Ann NY Acad Sci. 2006 Sep;1076:80–9. [PubMed]
86. Glass DC, Sim MR, Fritschi L, Gray CN, Jolley DJ, Gibbons C. Leukemia risk and relevant benzene exposure period—Re: follow-up time on risk estimates. Am J Ind Med. 2002;41:481–9. [PubMed]2004;45:222–3.
87. Glass DC, Gray CN, Jolley DJ, Gibbons C, Sim MR. Health watch exposure estimates: do they underestimate benzene exposure? Chem Biol Interact. 2005;153-154:23–32. [PubMed]
88. Huff J, Melnick RL, Solleveld HA, Haseman JK, Powers M, Miller RA. Multiple organ carcinogenicity of 1,3-butadiene in B6C3F1 mice after 60 weeks of inhalation exposure. Science. 1985;227(4686):548–9. [PubMed]
89. Melnick RL, Huff J, Chou BJ, Miller RA. Carcinogenicity of 1,3-butadiene in C57BL/6 × C3H F1 mice at low exposure concentrations. Cancer Res. 1990;50:6592–9. [PubMed]
90. Melnick RL, Kamel F, Huff J. Declaring chemicals “not carcinogenic to humans” requires validation, not speculation. Environ Health Perspect. 2003;111:A203–4. [PMC free article] [PubMed]
91. Haseman JK. An alternative perspective: a critical evaluation of the Waddell threshold extrapolation model in chemical carcinogenesis. Toxicol Pathol. 2003;31:468–70. [PubMed]
92. Huff J. Mechanisms, chemical carcinogenesis, and risk assessment: cell proliferation and cancer. Am J Ind Med. 1995;27:293–300. [PubMed]
93. Melnick RL, Kohn MC, Portier CJ. Implications for risk assessment of suggested nongenotoxic mechanisms of chemical carcinogenesis. Environ Health Perspect. 1996;104(suppl 1):123–34. [PMC free article] [PubMed]
94. Barrett JC, Huff J. Cellular and molecular mechanisms of chemically induced renal carcinogenesis. Ren Fail. 1991;13:211–25. [PubMed]
95. Melnick RL. An alternative hypothesis on the role of chemically induced protein droplet (alpha 2u-globulin) nephropathy in renal carcinogenesis. Regul Toxicol Pharmacol. 1992;16:111–25. [PubMed]
96. Melnick RL. Critique does not validate assumptions in the model on alpha 2u-globulin and renal carcinogenesis. Regul Toxicol Pharmacol. 1993;18:365–8. [PubMed]
97. Huff J. Alpha-2u-globulin nephropathy, posed mechanisms, and white ravens. Environ Health Perspect. 1996;104:1264–7. [PMC free article] [PubMed]
98. Melnick RL, Kohn MC, Huff J. Weight of evidence versus weight of speculation to evaluate the alpha2u-globulin hypothesis. Environ Health Perspect. 1997;105:904–6. [PMC free article] [PubMed]
99. Melnick RL. Is peroxisome proliferation an obligatory precursor step in the carcinogenicity of di(2-ethylhexyl)phthalate (DEHP)? Environ Health Perspect. 2001;109:437–42. [PMC free article] [PubMed]
100. Melnick RL. The IARC evaluation of di(2-ethylhexyl)phthalate (DEHP): a flawed decision based on an untested hypothesis. Int J Occup Environ Health. 2002;8:284–6. [PubMed]
101. Thayer KA, Melnick R, Burns K, Davis D, Huff J. Fundamental flaws of hormesis for public health decisions. Environ Health Perspect. 2005;113:1271–6. [PMC free article] [PubMed]
102. Thayer KA, Melnick R, Huff J, Burns K, Davis D. Hormesis: a new religion? Environ Health Perspect. 2006;114:A632–3. [PMC free article] [PubMed]
103. Melnick RL. Does chemically induced hepatocyte proliferation predict liver carcinogenesis? FASEB J. 1992;6:2698–706. [PubMed]
104. Melnick RL, Huff J, Barrett JC, Maronpot RR, Lucier G, Portier CJ. Cell proliferation and chemical carcinogenesis: a symposium overview. Mol Carcinog. 1993;7:135–8. [PubMed]
105. Melnick RL, Huff J. Liver carcinogenesis is not a predicted out come of chemically induced hepatocyte proliferation. Toxicol Ind Health. 1993;9:415–38. [PubMed]
106. Ward JM, Uno H, Kurata Y, Weghorst CM, Jang JJ. Cell proliferation not associated with carcinogenesis in rodents and humans. Environ Health Perspect. 1993;101(suppl 5):125–35. [PMC free article] [PubMed]
107. Tomatis L. Cell proliferation and carcinogenesis: a brief history and current view based on an IARC workshop report. International Agency for Research on Cancer. Environ Health Perspect. 1993;101(suppl 5):149–51. [PMC free article] [PubMed]
108. Farber E. Cell proliferation as a major risk factor for cancer: a concept of doubtful validity. Cancer Res. 1995;55:3759–62. [PubMed]
109. Farber E. Cell proliferation is not a major risk factor for cancer. Mod Pathol. 1996;9:606. [PubMed]
110. Hoel DG, Haseman JK, Hogan MD, Huff J, McConnell EE. The impact of toxicity on carcinogenicity studies: implications for risk assessment. Carcinogenesis. 1988;9:2045–52. [PubMed]
111. Huff J. Chemical toxicity and chemical carcinogenesis. Is there a causal connection? A comparative morphological evaluation of 1500 experiments. IARC Sci Publ. 1992;(116):437–75. [PubMed]
112. Huff J. Absence of morphologic correlation between chemical toxicity and chemical carcinogenesis. Environ Health Perspect. 1993;101(suppl 5):45–53. [PMC free article] [PubMed]
113. Huff J, Boyd J, Barrett JC, editors. Cellular and molecular mechanisms of hormonal carcinogenesis: environmental influences. Prog Clin Biol Res. 1996;394:i–xix. 1–479. [PubMed]
114. Huff J, Boyd J, Barrett JC. Hormonal carcinogenesis and environmental influences: background and overview. Prog Clin Biol Res. 1996;394:3–23. [PubMed]
115. Huff J. Chemically induced cancers in hormonal organs of laboratory animals and of humans. Prog Clin Biol Res. 1996;394:77–102. [PubMed]
116. Maronpot RR, Haseman JK, Boorman GA, Eustis SE, Rao GN, Huff J. Liver lesions in B6C3F1 mice: the National Toxicology Program, experience and position. Arch Toxicol. 1987;10(suppl):10–26. [PubMed]
117. Huff J, Eustis SL, Haseman JK. Occurrence and relevance of chemically induced benign neoplasms in long-term carcinogenicity studies. Cancer Metastasis Rev. 1989;8:1–22. Erratum in: Cancer Metastasis Rev 1989;8:281. [PubMed]
118. Huff J. Applicability to humans of “rodent-specific sites” of chemical carcinogenicity: tumors of the forestomach and of the harderian, preputial, and zymbal glands induced by benzene. J Occup Med Toxicol. 1992;1:109–41.
119. White MC, Infante PF, Walker B., Jr Occupational exposure to benzene: a review of carcinogenic and related health effects following the U.S. Supreme Court decision. Am J Ind Med. 1980;1:233–43. [PubMed]
120. Tsutsui T, Hayashi N, Maizumi H, Huff J, Barrett JC. Benzene-, catechol-, hydroquinone- and phenol-induced cell transformation, gene mutations, chromosome aberrations, aneuploidy, sister chromatid exchanges and unscheduled DNA synthesis in Syrian hamster embryo cells. Mutat Res. 1997;373:113–23. [PubMed]
121. Whysner J, Reddy MV, Ross PM, Mohan M, Lax EA. Genotoxicity of benzene and its metabolites. Mutat Res. 2004;(566):99–130. [PubMed]
122. Hirose M, Fukushima S, Shirai T, et al. Stomach carcinogenicity of caffeic acid, sesamol and catechol in rats and mice. Jpn J Cancer Res. 1990;81:207–12. [PubMed]
123. Hirose M, Fukushima S, Tanaka H, Asakawa E, Takahashi S, Ito N. Carcinogenicity of catechol in F344 rats and B6C3F1 mice. Carcinogenesis. 1993;14:525–9. [PubMed]
124. IARC Catechol. IARC Monogr Eval Carcinog Risks Hum. 1999;71(Pt 2):433–51. [PubMed]
125. Hirose M, Hakoi K, Takahashi S, et al. Sequential morphological and biological changes in the glandular stomach induced by oral administration of catechol to male F344 rats. Toxicol Pathol. 1999;27:448–55. [PubMed]
126. Hagiwara A, Takesada Y, Tanaka H, et al. Dose-dependent induction of glandular stomach preneoplastic and neoplastic lesions in male F344 rats treated with catechol chronically. Toxicol Pathol. 2001;29:180–6. [PubMed]
127. Kari F. National Toxicology Program. NTP Toxicology and Carcinogenesis Studies of Hydroquinone (CAS No. 123-31-9) in F344/N Rats and B6C3F1 Mice (Gavage Studies) Natl Toxicol Program Tech Rep Ser. 1989 Oct;366:1–248. [PubMed]
128. Kari FW, Bucher J, Eustis SL, Haseman JK, Huff J. Toxicity and carcinogenicity of hydroquinone in F344/N rats and B6C3F1 mice. Food Chem Toxicol. 1992;30:737–47. [PubMed]
129. Shibata MA, Hirose M, Tanaka H, Asakawa E, Shirai T, Ito N. Induction of renal cell tumors in rats and mice, and enhancement of hepatocellular tumor development in mice after long-term hydroquinone treatment. Jpn J Cancer Res. 1991;82:1211–9. [PubMed]
130. IARC Hydroquinone. IARC Monogr Eval Carcinog Risks Hum. 1999;71(Pt 2):691–719. [PubMed]
131. Huff J. National Toxicology Program. Bioassay of Phenol for Possible Carcinogenicity (CAS No.108-95-2) Natl Toxicol Program Tech Rep Ser. 1980 Aug;203:1–123. [PubMed]
132. Huff J. Carcinogenesis results on seven amines, two phenols, and one diisocyanate used in plastics and synthetic elastomers. Prog Clin Biol Res. 1984;141:347–63. [PubMed]
133. IARC Phenol. IARC Monogr Eval Carcinog Risks Hum. 1999;71(Pt 2):749–68. [PubMed]
134. Gopalakrishna R, Chen ZH, Gundimeda U. Tobacco smoke tumor promoters, catechol and hydroquinone, induce oxidative regulation of protein kinase C and influence invasion and metastasis of lung carcinoma cells. Proc Natl Acad Sci USA. 1994;91:12233–7. [PubMed]
135. Rothman N, Bechtold WE, Yin SN, et al. Urinary excretion of phenol, catechol, hydroquinone, and muconic acid by workers occupationally exposed to benzene. Occup Environ Med. 1998;55:705–11. [PMC free article] [PubMed]
136. Golding BT, Watson WP. Possible mechanisms of carcinogenesis after exposure to benzene. IARC Sci Publ. 1999;150:75–88. [PubMed]
137. Lau SS, Monks TJ, Everitt JI, Kleymenova E, Walker CL. Carcinogenicity of a nephrotoxic metabolite of the “nongenotoxic” carcinogen hydroquinone. Chem Res Toxicol. 2001;14:25–33. [PubMed]
138. Rall DP. The role of laboratory animal studies in estimating carcinogenic risks for man. IARC Sci Publ. 1979;25:179–89. [PubMed]
139. Huff J, Moore J, Rall D. The National Toxicology Program and preventive oncology. In: Estrin N, Estrin N, editors. The Cosmetic Industry: Scientific and Regulatory Foundations. Marcel Dekker; New York: 1984. pp. 647–76.
140. Rall DP. Relevance of animal experiments to humans. Environ Health Perspect. 1979;32:297–30. [PMC free article] [PubMed]
141. Rall DP, Hogan MD, Huff JE, Schwetz BA, Tennant RW. Alternatives to using human experience in assessing health risks. Annu Rev Public Health. 1987;8:355–85. [PubMed]
142. Haseman JK, Huff JE, Zeiger E, McConnell EE. Comparative results of 327 chemical carcinogenicity studies. Environ Health Perspect. 1987;74:229–35. [PMC free article] [PubMed]
143. Huff J, McConnell EE, Haseman JK, et al. Carcinogenesis studies: results of 398 experiments on 104 chemicals from the U.S. National Toxicology Program. Ann NY Acad Sci. 1988;534:1–30. [PubMed]
144. Rall DP. Laboratory animal toxicity and carcinogenesis testing. Underlying concepts, advantages and constraints. Ann NY Acad Sci. 1988;534:78–83. [PubMed]
145. Rall DP. Carcinogens in our environment. IARC Sci Publ. 1990;104:233–9. [PubMed]
146. Huff J, Haseman J, Rall D. Scientific concepts, value, and significance of chemical carcinogenesis studies. Annu Rev Pharmacol Toxicol. 1991;31:621–52. [PubMed]
147. Huff J, Hoel D. Perspective and overview of the concepts and value of hazard identification as the initial phase of risk assessment for cancer and human health. Scand J Work Environ Health. 1992;18(suppl 1):83–9. [PubMed]
148. Huff J, Rall DP. Relevance to humans of carcinogenesis results from laboratory animal toxicology studies. In: Last JM, Wallace RB, editors. Maxcy–Rosenau–Last’s Public Health & Preventive Medicine. 13th ed Appleton & Lange; Norwalk, CT: 1992. pp. 433–440.pp. 453–457.pp. 1257
149. Fung VA, Huff J, Weisburger EK, Hoel DG. Predictive strategies for selecting 379 NCI/NTP chemicals evaluated for carcinogenic potential: scientific and public health impact. Fundam Appl Toxicol. 1993;20:413–36. Erratum in: Fundam Appl Toxicol 1993;21:402. [PubMed]
150. Huff J. Issues and controversies surrounding qualitative strategies for identifying and forecasting cancer causing agents in the human environment. Pharmacol Toxicol. 1993;72(suppl 1):12–27. [PubMed]
151. Rall DP. Shoe-leather epidemiology—the footpads of mice and rats: animal tests in assessment of occupational risks. Mt Sinai J Med. 1994;61:504–8. [PubMed]
152. Fung VA, Barrett JC, Huff J. The carcinogenesis bioassay in perspective: application in identifying human cancer hazards. Environ Health Perspect. 1995;103:680–3. [PMC free article] [PubMed]
153. Rall DP. Can laboratory animal carcinogenicity studies predict cancer in exposed children? Environ Health Perspect. 1995;103(suppl 6):173–5. [PMC free article] [PubMed]
154. Huff J, Weisburger E, Fung VA. Multicomponent criteria for predicting carcinogenicity: dataset of 30 NTP chemicals. Environ Health Perspect. 1996;104(suppl 5):1105–12. [PMC free article] [PubMed]
155. Huff J. Carcinogenesis results in animals predict cancer risks to humans. In: Wallace RB, editor. Maxcy–Rosenau–Last’s Public Health & Preventive Medicine. 14th ed. Appleton & Lange; Norwalk, CT: 1998. pp. 543–550.pp. 567–569. Chapter 23.
156. Huff J. Long-term chemical carcinogenesis bioassays predict human cancer hazards. Issues, controversies, and uncertainties. Ann NY Acad Sci. 1999;895:56–79. [PubMed]
157. Rall DP. Laboratory animal tests and human cancer. Drug Metab Rev. 2000;32:119–28. [PubMed]
158. Tomatis L. Etiologic evidence and primary prevention of cancer. Drug Metab Rev. 2000;32:129–37. [PubMed]
159. Tomatis L, Huff J. Evolution of cancer etiology and primary prevention. Environ Health Perspect. 2001;109:A458–60. [PMC free article] [PubMed]
160. Huff J. IARC monographs, industry influence, and upgrading, downgrading, and under-grading chemicals: a personal point of view. International Agency for Research on Cancer. Int J Occup Environ Health. 2002;8:249–70. Erratum in: Int J Occup Environ Health. 2003;9:84. [PubMed]
161. Tomatis L, Huff J. Evolution of research on cancer etiology. In: Coleman WB, Tsongalis GJ, editors. The Molecular Basis of Human Cancer: Genomic Instability and Molecular Mutation in Neoplastic Transformation. Humana Press Inc.; Totowa, NJ: 2002. pp. 189–201. Chapter 9.
162. Johnson FM, Huff J. Bioassay bashing is bad science. Environ Health Perspect. 2002;110:A736–7. [PMC free article] [PubMed]
163. Melnick RL. Carcinogenicity and mechanistic insights on the behavior of epoxides and epoxide-forming chemicals. Ann NY Acad Sci. 2002;982:177–89. [PubMed]
164. Tomatis L. Primary prevention protects public health. Ann NY Acad Sci. 2002;982:190–7. [PubMed]
165. Maronpot RR, Flake G, Huff J. Relevance of animal carcino-genesis findings to human cancer predictions and prevention. Toxicol Pathol. 2004;32(suppl 1):40–8. [PubMed]
166. Huff J, Melnick R, Tomatis L, LaDou J, Teitelbaum D. Trichloroethylene and cancers in humans. Toxicology. 2004;197:185–7. [PubMed]
167. Melnick RL, Huff J. Testing toxic pesticides in humans: health risks with no health benefits. Environ Health Perspect. 2004;112:A459–61. [PMC free article] [PubMed]
168. Tomatis L. Primary prevention of cancer in relation to science, sociocultural trends and economic pressures. Scand J Work Environ Health. 2005;31:227–32. [PubMed]
169. Melnick RL. A Daubert motion: a legal strategy to exclude essential scientific evidence in toxic tort litigation. Am J Public Health. 2005;95(suppl 1):S30–4. [PubMed]
170. Tomatis L. Experimental chemical carcinogenesis: fundamental and predictive rôle in protecting human health in the 1930s–1970s. Eur J Oncol. 2006;11:5–13.
171. Tomatis L. Role of experimental and epidemiological evidence of carcinogenicity in the primary prevention of cancer. Ann Ist Super Sanita. 2006;42:113–7. [PubMed]
172. Huff J, Melnick RM, Gold LS, Slone TH, Manley NB, Ames BN. What are the real causes of cancer? An opinionated book review of “Misconceptions about the Causes of Cancer” Int J Occup Environ Health. 2006;12:81–6.
173. Tomatis L. Identification of carcinogenic agents and primary prevention of cancer. Ann NY Acad Sci. 2006;1076:1–14. [PubMed]