Cited by 2,445Per- and polyfluoroalkyl substances researchToxic Organic Pollutants ImpactFluorine in Organic Chemistry

Per- and Polyfluoroalkyl Substance Toxicity and Human Health Review: Current State of Knowledge and Strategies for Informing Future Research

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Fenton, Suzanne E., Ducatman, Alan, Boobis, Alan, DeWitt, Jamie C., Lau, Christopher, Ng, Carla, Smith, James S., Roberts, Stephen M.·2020·Environmental Toxicology and Chemistry

Abstract

Reports of environmental and human health impacts of per- and polyfluoroalkyl substances (PFAS) have greatly increased in the peer-reviewed literature. The goals of the present review are to assess the state of the science regarding toxicological effects of PFAS and to develop strategies for advancing knowledge on the health effects of this large family of chemicals. Currently, much of the toxicity data available for PFAS are for a handful of chemicals, primarily legacy PFAS such as perfluorooctanoic acid and perfluorooctane sulfonate. Epidemiological studies have revealed associations between exposure to specific PFAS and a variety of health effects, including altered immune and thyroid function, liver disease, lipid and insulin dysregulation, kidney disease, adverse reproductive and developmental outcomes, and cancer. Concordance with experimental animal data exists for many of these effects. However, information on modes of action and adverse outcome pathways must be expanded, and profound differences in PFAS toxicokinetic properties must be considered in understanding differences in responses between the sexes and among species and life stages. With many health effects noted for a relatively few example compounds and hundreds of other PFAS in commerce lacking toxicity data, more contemporary and high-throughput approaches such as read-across, molecular dynamics, and protein modeling are proposed to accelerate the development of toxicity information on emerging and legacy PFAS, individually and as mixtures. In addition, an appropriate degree of precaution, given what is already known from the PFAS examples noted, may be needed to protect human health. Environ Toxicol Chem 2021;40:606–630. © 2020 SETAC Abstract Many health effects have been reported in association with or due to per- and polyfluoroalkyl substance (PFAS) exposures in humans and toxicologic models. Species concordance of effects is evident for a handful of legacy PFAS. With hundreds of PFAS in commerce that lack exposure and health effects data, contemporary and novel methods must be implemented to inform exposed communities, risk assessors, and concerned citizens and prioritize those most likely to affect human health.

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  • Extensive human health research has identified possible carcinogenic, reproductive, endocrine, neurotoxic, dyslipidemic, and immunotoxic effects from PFAS exposure.

    “Human-health effects from exposure to PFAS have been studied extensively, identifying possible carcinogenic, reproductive, endocrine, neurotoxic, dyslipidemia, and immunotoxic effects (6, 108, 109).”

    From Per- and polyfluoroalkyl substances in the environment (2022) · cites this paper as [6]

    The Abstract (page not available) reports human epidemiological associations with cancer, reproductive outcomes, altered thyroid and immune function, and lipid dysregulation. The Neurotoxicity section (page not available) says potential nervous-system effects have not been widely investigated and cites mainly cell and rodent findings; the Reproductive and developmental outcomes section describes human neurodevelopment studies as inconclusive. Thus, the source supports most of the list, but not the implication that extensive human research has identified neurotoxic effects. (LLM, conf=0.84)

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  • PFAS are globally persistent and are detectable in the blood of nearly all humans.

    “Widespread global persistence of PFAS has resulted in detectable concentrations of the compounds in the blood of almost the entire human population (6).”

    From Per- and polyfluoroalkyl substances in the environment (2022) · cites this paper as [6]

    The Introduction says that widespread exposure, together with the environmental persistence and biological half-lives of some PFAS, has led to measurable PFAS in the blood of nearly the entire population in developed countries. The citing sentence extends that finding to almost the entire global population and attributes it to persistence alone; the passage does not support those extensions. No page number was supplied for the passage. (LLM, conf=0.90)

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  • Multiple PFAS analytes detected in this study have been associated with adverse health effects in humans, including cancers, developmental delays, and reproductive dysfunction.

    “Multiple PFAS analytes detected in this study have been associated with adverse health effects in humans, including cancers, developmental delays, and reproductive dysfunction.7,8”

    From Per- and Polyfluoroalkyl Substances in Surface Water and Fluvial Sediments of a Rural Gulf Coast Watershed: A Year-long Spatiotemporal Assessment (2026) · cites this paper as [7]

    The review’s Reproductive and developmental outcomes section reports human associations with testicular cancer, impaired fertility, and adverse infant-development outcomes. But its explicit reference to “developmental delays” is in the Reproductive and developmental toxicity section’s discussion of exposed animal offspring; the review describes human neurodevelopmental evidence as inconclusive. The source also cannot establish which analytes were detected in the citing study. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • PFASs cause thyroid hormone disruption by binding to thyroid hormone transport proteins, displacing T4, and interfering with thyroid peroxidase activity, leading to altered feedback in the hypothalamic-pituitary-thyroid axis.

    “PFASs also cause thyroid hormone disruption by binding to thyroid hormone transport proteins, displacing thyroxine (T4), and interfering with thyroid peroxidase activity, leading to altered feedback in the hypothalamic-pituitary-thyroid axis.”

    From Industrial Applications, Environmental Fate, Human Exposure, and Health Effects of PFAS (2025) · cites this paper as [201]

    The Endocrine disruption section describes displacement of thyroxine from transport proteins as a possible mechanism, not an established causal pathway. The Thyroid function section reports PFAS interactions with thyroid-hormone binding proteins and interference with thyroid peroxidase activity in vitro, but does not establish that these mechanisms together cause the claimed change in hypothalamic-pituitary-thyroid feedback. Page numbers were not supplied. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Disruption of neurotransmitters and neuromodulators by PFAS may contribute to increased risk of neuropsychiatric disorders, as well as other health risks associated with PFAS exposure, such as obesity, cancer, and thyroid disease.

    “Disruption of neurotransmitters and neuromodulators by PFAS may contribute to increased risk of neuropsychiatric disorders, as well as other health risks associated with PFAS exposure, such as obesity, cancer, and thyroid disease”

    From A Critical Review and Meta-Analysis of Impacts of Per- and Polyfluorinated Substances on the Brain and Behavior (2022) · cites this paper as Fenton et al., 2021

    The Neurotoxicity section (page unavailable) reports limited evidence of PFAS-related nervous-system effects, including altered behavior in rodents, but does not describe disruption of neurotransmitters or neuromodulators or link it to neuropsychiatric disorders. The Obesity, Tumor induction, and Thyroid function sections discuss PFAS-related evidence for the other named health risks, with qualifications; they do not connect those risks to neurotransmitter disruption. (LLM, conf=0.85)

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Research works printed but not linked: 1

  1. [312]312. Rijksinstituut voor Volksgezondheid en Milieu, Bilthoven, Netherlands. [cited 2020 July 13]. Available from: https://doi.org/10.21945/rivm- 2018-0070 · DOI

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Authors
Fenton, S. E., Ducatman, A., Boobis, A., DeWitt, J. C., Lau, C., Ng, C., Smith, J. S., & Roberts, S. M.
Affiliations
  • National Institutes of Health (US)
  • West Virginia University (US)
  • Imperial College London (GB)
  • East Carolina University (US)
  • Environmental Protection Agency (US)
  • University of Pittsburgh (US)
  • Navy and Marine Corps Force Health Protection Command (US)
  • University of Florida (US)
Corresponding author
Roberts, Stephen M.
Venue
Environmental Toxicology and Chemistry
Published
2020-10-05
Volume
40
Issue
3
Pages
606-630
ISSN
  • 0730-7268 (ISSN-L)
  • 1552-8618
OpenAlex
W3091745167
Cited by
2,445
References
308
Citations by year
2026: 638 · 2025: 643 · 2024: 520 · 2023: 360 · 2022: 212 · 2021: 67 · 2020: 4
FWCI
11.68
Type
journal article
Language
en
Open access
Locations
  • Environmental Toxicology and Chemistry (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Department of Defense
  • U.S. Environmental Protection Agency
  • New Jersey Department of Environmental Protection
  • National Institutes of Health
  • U.S. Navy
  • National Institute of Environmental Health Sciences (ZIAES102785)
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Per- and polyfluoroalkyl substances research
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmaceutical Science › Fluorine in Organic Chemistry
Keywords
per- and polyfluoroalkyl substances, PFAS toxicity, perfluorooctanoic acid, PFOS, human health effects, immune function, thyroid function, liver disease, insulin dysregulation, kidney disease, reproductive and developmental toxicity, cancer, toxicokinetics, sex differences, life stage differences, read-across, molecular dynamics, protein modeling, PFAS mixtures, precautionary approach, risk assessment
MeSH terms
Adverse Outcome Pathways, Animals, Fluorocarbons, Humans, Reproduction, Alkanesulfonic Acids

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