The IARC Classification.
The International Agency for Research on Cancer (IARC), part of the World Health Organization (WHO), is a global scientific reference authority in the assessment of carcinogenic risks. Through the IARC Monographs program, the agency classifies chemical, physical and biological agents according to their potential carcinogenicity to humans.
The classification of carcinogens is based on a thorough analysis of epidemiological data, laboratory animal studies and biological mechanisms. Agents are divided into five main groups:
- Group 1 - Car cinogenic to humans: sufficient evidence of carcinogenicity in humans.
- Group 2A - Probably carcinogenic to humans: limited evidence in humans and sufficient evidence in animals.
- Group 2B - Possibly carcinogenic to humans: limited evidence in both humans and animals.
- Group 3 - Unclassifiable: insufficient evidence for an evaluation.
- Group 4 - Probably non-carcinogenic to humans: sufficient evidence of non-carcinogenicity.
Currently, IARC has classified more than 1,000 agents, with 133 in Group 1, 96 in Group 2A, 322 in Group 2B and 501 in Group 3.
The classification of carcinogens is based on a thorough analysis of epidemiological data, laboratory animal studies and biological mechanisms. Agents are divided into five main groups:
- Group 1 - Car cinogenic to humans: sufficient evidence of carcinogenicity in humans.
- Group 2A - Probably carcinogenic to humans: limited evidence in humans and sufficient evidence in animals.
- Group 2B - Possibly carcinogenic to humans: limited evidence in both humans and animals.
- Group 3 - Unclassifiable: insufficient evidence for an evaluation.
- Group 4 - Probably non-carcinogenic to humans: sufficient evidence of non-carcinogenicity.
Currently, IARC has classified more than 1,000 agents, with 133 in Group 1, 96 in Group 2A, 322 in Group 2B and 501 in Group 3.
Examples of classified agents
- Group 1: tobacco smoke, asbestos, benzene, ethyl alcohol, formaldehyde.
- Group 2A: radon, acrylamide, some pesticides, some chemotherapy drugs.
- Group 2B: coffee, palm oil, some food dyes, welding fumes.
- Group 3: sugar, table salt, olive oil, drinking water.
- Group 2A: radon, acrylamide, some pesticides, some chemotherapy drugs.
- Group 2B: coffee, palm oil, some food dyes, welding fumes.
- Group 3: sugar, table salt, olive oil, drinking water.
Evaluation method
IARC takes a rigorous scientific approach to the evaluation of agents. Each assessment considers:
- Epidemiological evidence: studies in human populations.
- Laboratory animal studies: controlled experiments.
- Biological mechanisms: understanding cellular and molecular processes.
The assessments are carried out by international expert panels and are updated periodically in light of new scientific evidence.
- Epidemiological evidence: studies in human populations.
- Laboratory animal studies: controlled experiments.
- Biological mechanisms: understanding cellular and molecular processes.
The assessments are carried out by international expert panels and are updated periodically in light of new scientific evidence.
Patients at high risk for urinary tract cancer
These carcinogens are filtered by the kidneys and excreted through the urinary tract, remaining in contact with the bladder and promoting tumor development. Therefore, smokers and so-called "exposed individuals" should undergourinary cytology examination. In these individuals, urinary cytology can be used as part of a surveillance protocol, especially if they have suspicious symptoms or abnormalities in urinalysis.
Conclusion
Understanding the classification of carcinogens is critical to adopting preventive behaviors and promoting public health. IARC continues to play a crucial role in research and dissemination of knowledge to counter the global spread of cancer.
