For definitions of these groups, please see the Preamble.

 

The Preamble to the IARC Monographs describes the objective and scope of the programme, the scientific principles and procedures used in developing a Monograph, the types of evidence considered and the scientific criteria that guide the evaluations. The Preamble should be consulted when reading a Monograph or list of evaluations.

It is strongly recommended to consult the complete Monographs on these agents, the publication date, and the list of studies considered. Significant new information might support a different classification.

For agents that have not been classified, no determination of non-carcinogenicity or overall safety should be inferred.

Table Last Update 06.09.2023

Group	Name	n. agents May	n. agents July	n. agents July II	n. agents Sept.
Group 1	Carcinogenic to humans	121	126	126	127
Group 2A	Probably carcinogenic to humans	90	94	95	95
Group 2B	Possibly carcinogenic to humans	323	322	323	323
Group 3	Not classifiable as to its carcinogenicity to humans	498	500	500	500

- List of Classifications by cancer site Vol. 1-134 September 2023 (PDF file)
- List of Classifications by cancer site Vol. 1-134 September 2023 (XLS file)
- List of Classifications by cancer site Vol. 1-134 July 2023 (PDF file)
- List of Classifications by cancer site Vol. 1-134 July 2023 (XLS file)
- List of Classifications by cancer site Vol. 1-133 July 2023 (PDF file)
- List of Classifications by cancer site Vol. 1-133 July 2023 (XLS file)
- List of Classifications by cancer site Vol. 1-133 May 2023 (PDF file)
- List of Classifications by cancer site Vol. 1-133 May 2023 (XLS file)
- List of Classifications by cancer site Vol. 1-132 July 2022 (PDF file)
- List of Classifications by cancer site Vol. 1-132 July 2022 (XLS file)
- List of Classifications by cancer site Vol. 1-131 April 2022 (PDF file)
- List of Classifications by cancer site Vol. 1-131 April 2022 (XLS file)
- List of Classifications by cancer site Vol. 1-130 March 2022 (PDF file)
- List of Classifications by cancer site Vol. 1-130 March 2022 (XLS file)
- List of Classifications by cancer site Vol. 1-130 November 2021 (PDF file)
- List of Classifications by cancer site Vol. 1-130 November 2021 (XLS file)
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- List of Classifications by cancer site Vol. 1-129 November 2021 (XLS file)
- List of Classifications by cancer site Vol. 1-128 November 2020 (PDF file)
- List of Classifications by cancer site Vol. 1-128 November 2020 (XLS file)
- List of Classifications by cancer site Vol. 1-124 July 2019 (PDF file)
- List of Classifications by cancer site Vol. 1-124 July 2019 (XLS file)
- Preventable Exposures Associated With Human Cancers (Cogliano et al., 2011)