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  1. Feb 24, 2015 · Group 2B: The agent is possibly carcinogenic to humans. This category is used for agents for which there is limited evidence of carcinogenicity in humans and less than sufficient evidence of carcinogenicity in experimental animals.

    • Neil Pearce, Aaron Blair, Paolo Vineis, Wolfgang Ahrens, Aage Andersen, Josep M. Anto, Bruce K. Arms...
    • 2015
  2. Jun 16, 2023 · 16 June 2023. IARC Monographs hazard classification. This infographic presents the categories used by the IARC Monographs on the Identification of Carcinogenic Hazards to Humans to classify a substance according to the level of certainty that the substance can cause cancer.

  3. Since 1971, more than 1000 agents have been evaluated, of which more than 500 have been identified as carcinogenic, probably carcinogenic, or possibly carcinogenic to humans. Read the IARC Monographs Q&A for answers to commonly asked questions on the evaluation process.

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    • Abstract
    • Motivation and Process For Preamble Revision
    • Key Changes in The Revised Preamble
    • Funding
    • Notes

    For nearly 50 years, the Monographs program of the International Agency for Research on Cancer (IARC) has been a premier global resource for identifying agents that can cause cancer. The identification of carcinogenic hazards is a necessary initial step in cancer prevention. National and international authorities and organizations use information o...

    Since 2006, substantial growth has occurred in the scientific understanding of factors contributing to carcinogenicity as well as in the development of methods for information gathering, evidence assessment, and integration. In 2018, the IARC convened an “Advisory Group to Recommend an Update to the Preamble,” with broad expertise across multiple d...

    General Procedures

    The advisory group encouraged the IARC to clarify the purpose and scope of the Monographs evaluations. In this regard, the name of the Monographs series has been changed to the IARC Monographs on the Identification of Carcinogenic Hazards to Humans. This change, although semantic in nature, reflects the important distinction between hazard and risk: Hazard refers to the strength of the evidence that an agent is a carcinogen, whereas risk refers to the probability that a given exposure to a ca...

    Scientific Review and Evaluation

    The revised Preamble defines how the principles of systematic review (eg, formal consideration of quality of the studies, such as design and methodology, and the reporting of results that are tailored to each stream of evidence and the types of studies available) apply to IARC assessments and how evaluations are reached to clearly articulate the rationales for expert judgments. At the same time, it is designed to be flexible enough to enable incorporation of further scientific advances as the...

    This work was supported by the German Ministry of Health and the International Agency for Research on Cancer.

    The findings and conclusions in this article are those of the authors and do not necessarily represent the official position of the International Agency for Research on Cancer, the US Centers for Disease Control and Prevention, the US Food and Drug Administration, the US Environmental Protection Agency, or the US National Institute of Environmental...

    • Jonathan M Samet, Weihsueh A Chiu, Vincent Cogliano, Jennifer Jinot, David Kriebel, Ruth M Lunn, Fre...
    • 2020
  5. Dec 1, 2023 · Carcinogenic to humans: 128 agents: Group 2A: Probably carcinogenic to humans 95 agents: Group 2B: Possibly carcinogenic to humans: 323 agents: Group 3: Not classifiable as to its carcinogenicity to humans: 500 agents

  6. The Preamble was most recently reviewed and updated in 2019, when the name of the IARC Monographs programme was also revised. Since 1971, more than 1000 agents have been evaluated, of which more than 500 have been identified as carcinogenic, probably carcinogenic, or possibly carcinogenic to humans.

  7. Jul 14, 2023 · This group is for substances defined as ‘probably carcinogenic to humans’; this means that the evidence in humans is still somewhat limited, but there is sufficient evidence in experimental animals of the substance’s carcinogenic nature.