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Open research questions in Carcinogens and Genotoxicity Assessment

26 unresolved questions extracted from the limitations and future-work sections of 584 Carcinogens and Genotoxicity Assessment papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Addressing the identified research gaps requires a coordinated, multi-scale strategy that integrates advanced exposure assessment, mechanistic toxicology, epigenomics, and population-based epidemiology, while also accounting for emerging regulatory challenges associated with the transition to electric mobility. Advancing standardized and real-world exposure assessment. Future studies should prioritize the development of standardized methodologies for characterizing non-exhaust traffic emissions, particularly TBWPs, across laboratory, animal, and population-based research. This includes harmonized protocols for particle collection, physicochemical characterization, and exposure metrics that reflect realworld traffic environments. Given that traffic-related pollutants rarely occur in isolation, experimental designs should increasingly incorporate realistic exposure scenarios involving complex pollutant mixtures to better capture combined and dose-dependent effects. Such approaches will enhance the ecological validity of toxicological findings and improve the accuracy of health risk assessments. Multi-omics integration to elucidate epigenetic mechanisms. Integrative multi-omics approaches represent a critical pathway for bridging the mechanistic gap between TBWPs exposure and disease development. Future research should strengthen the precise detection and functional validation of epigenetic biomarkers in human-relevant models, including lung organoids, and ex vivo tissue systems. airway epithelial cells, Particular emphasis should be placed on profiling miRNA expression patterns, m6A RNA modifications, and regulatory changes in epigenetic enzymes such as DNMTs and HATs. High-resolution techniques, including ChIP-seq, bisulfite sequencing, and miRNA sequencing, should be systematically applied to determine whether TBWPs exposure promotes pulmonary fibrosis, epithelial barrier dysfunction, or chronic inflammatory phenotypes through epigenetic reprogramming. These efforts may help identify early molecular events in lung pathogenesis and establish mechanistically anchored biomarkers of exposure and effect.

    Epigenetic mechanisms linking traffic-related organic pollutants to pulmonary damage: insights from tire and brake wear · 2026 · DOI

  • Organophosphate flame retardants (OPFRs) such as tributyl phosphate (TBP) are widely used industrial additives increasingly detected in the environment and human tissues, yet their inhalation toxicity remains poorly characterized.

    Acute or repeated exposure of aerosolized flame retardants induces molecular and structural alterations in lung slices · 2026 · DOI

  • Biomonitoring data for naph- thalene in children, especially in North America, is sparse, with very little data collected more recently than the NHANES data that we used for comparison.

    High levels of urinary naphthalene metabolites measured in a sample of California schoolchildren: a call to expand monitoring and identify exposure sources · 2026 · DOI

  • Limited studies have been carried out on the cytotoxic and genotoxic effects of both CHN using different genotoxicity tests in human cells with or without human metabolic activation system (S9 mix).

    Cytotoxicity and genotoxicity of clothianidin in human lymphocytes with or without metabolic activation system · 2018 · DOI

  • The bioactivation of drugs is often associated with toxicological outcomes; however, for most cases, the causal relationship between bioactivation and toxicity is not well established despite extensive research that attempts to elucidate the mechanisms leading to the formation of chemically reactive species, presumably the initial step towards adverse reactions.

    Non-cytochrome P450-mediated bioactivation and its toxicological relevance · 2016 · DOI

  • While it has been shown to deliver significant quantities of several carcinogenic and toxic substances, phenols, an important class of chemical compounds thought to promote DNA mutation and cardiovascular diseases, however, has not been studied.

    Phenolic Compounds in Particles of Mainstream Waterpipe Smoke · 2012 · DOI

  • These metabolites have been shown to elicit greater toxicity than the parent BDE congeners in laboratory bioassays; thus, more research on body burdens and human health effects from these metabolites are warranted.

    Metabolism of Polybrominated Diphenyl Ethers (PBDEs) by Human Hepatocytes <i>in Vitro</i> · 2008 · DOI

  • In 1997 the International Agency for Research on Cancer (IARC) classified TCDD (2,3,7,8-tetrachlorodibenzo-p-dioxin, the most potent dioxin congener) as a group 1 carcinogen (IARC 1997) based on limited evidence in humans, sufficient evidence in animals, and extensive mechanistic information indicating that TCDD acts through a mechanism involving the aryl hydrocarbon receptor (AhR), which is present in both humans and animals.

    Dioxin Revisited: Developments Since the 1997 IARC Classification of Dioxin as a Human Carcinogen · 2004 · DOI

  • Methodological issues in the interpretation of animal cancer tests: constraints on the estimation of carcinogenic potency and validity problems associated with using the limited data from bioassays to estimate human risk, reproducibility of results in carcinogenesis bioassays, comparison of lifetable and summary methods of analysis, and summarizing carcinogenic potency when multiple experiments on a chemical are positive.

    What do Animal Cancer Tests Tell us About Human Cancer Risk?: Overview of Analyses of the Carcinogenic Potency Database · 1998 · DOI

  • To date, there are very few data on the quality and safety of Turopolje ham, including information on the content and distribution of potential contaminants such as polycyclic aromatic hydrocarbons (PAHs) from smoke.

    Influence of smoking method and anatomical location on the content of polycyclic aromatic hydrocarbons in Turopolje ham · 2024 · DOI

  • Given that EtO-emitting facilities are concentrated in diverse and disadvantaged communities, further study of EtO exposure health effects is warranted to inform public policy on toxic air emissions.

    Integrative literature review: Ethylene oxide exposure signs and symptoms · 2023 · DOI

  • BACKGROUND: Although ethylene oxide (EtO) gas is designated as a human carcinogen, extant literature reports mixed findings on the health effects of exposure.

    Integrative literature review: Ethylene oxide exposure signs and symptoms · 2023 · DOI

  • It appears that the Abraham equation could be used to predict the NOAEL values for compounds lacking information concerning their liver toxicity.

    A proposal for calculating the no-observed-adverse-effect level (NOAEL) for organic compounds responsible for liver toxicity based on their physicochemical properties · 2014 · DOI

  • The optimal use of nicotine metabolites in urine, singly or in combination, with or without correction for urine creatinine concentration, to estimate plasma cotinine concentration with low-level nicotine exposure has not been determined.

    Urine nicotine metabolite concentrations in relation to plasma cotinine during low-level nicotine exposure · 2009 · DOI

  • However, cytogenetic evaluation of genotoxic effects of thyroxine gave equivocal results: increase of sister chromatid exchanges, and no incerase of micronuclei in cultured human lymphocytes.

    Evaluation of the genotoxic effects of thyroxine using in vivo cytogenetic test on Swiss albino mice · 2007 · DOI

  • The working group also concluded that 2-butoxyethanol and 1-tert-butoxy-2-propanol are not classifiable as to their carcinogenicity to humans, each having limited evidence in experimental animals and inadequate evidence in humans.

    Meeting Report: Summary of <i>IARC Monographs</i> on Formaldehyde, 2-Butoxyethanol, and 1- <i>tert</i> -Butoxy-2-Propanol · 2005 · DOI

  • In the epidemiologic studies, there was sufficient evidence that formaldehyde causes nasopharyngeal cancer, "strong but not sufficient" evidence of leukemia, and limited evidence of sinonasal cancer.

    Meeting Report: Summary of <i>IARC Monographs</i> on Formaldehyde, 2-Butoxyethanol, and 1- <i>tert</i> -Butoxy-2-Propanol · 2005 · DOI

  • Despite the importance of these diseases, key issues remain to be resolved regarding the interactions of chemicals with lung tissue and the factors that are critical determinants of chemical-induced lung injury.

    NAPHTHALENE-INDUCED RESPIRATORY TRACT TOXICITY: METABOLIC MECHANISMS OF TOXICITY · 2002 · DOI

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26 open questions have been extracted from the limitations and future-work passages of 584 Carcinogens and Genotoxicity Assessment papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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