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Related Concept Videos

Mutagenicity and Carcinogenicity01:25

Mutagenicity and Carcinogenicity

Mutagenicity and carcinogenicity refer to the ability of drugs to cause genetic defects and induce cancer, respectively. The International Agency for Research on Cancer (IARC) classifies agents into four groups based on their carcinogenic potential. Group 1 agents are known human carcinogens; group 2A agents are probably carcinogenic to humans; group 3 agents lack data to support their role in carcinogenesis; and group 4 includes agents for which data support that they are not likely to be...
2° Amines to N-Nitrosamines: Reaction with NaNO201:20

2° Amines to N-Nitrosamines: Reaction with NaNO2

Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
Toxicity Testing in Animals01:23

Toxicity Testing in Animals

Toxicity tests in animals are grounded on two main assumptions: first, the effects observed in laboratory animals can be extrapolated to humans, especially when adjusted for body surface area; second, high-dose exposure in animals is essential to identify potential human hazards from lower doses. This is based on the quantal dose-response concept, which faces the challenge of extrapolating results from relatively few test animals to much larger human populations. For example, a 0.01% incidence...

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Related Experiment Video

Updated: Jun 30, 2026

A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s
07:38

A General Method for Detecting Nitrosamide Formation in the In Vitro Metabolism of Nitrosamines by Cytochrome P450s

Published on: September 25, 2017

New Approach Methodologies (NAMs) for Carcinogenicity Evaluation.

Frederic Schorsch1, Mirjam Luijten2, Mark Cronin3

  • 1Bayer SAS Crop Science Division, Sophia Antipolis, France.

Toxicologic Pathology
|June 29, 2026
PubMed
Summary
This summary is machine-generated.

New methods are being explored to evaluate carcinogenic risks, moving beyond traditional animal testing. These innovative approaches aim for more accurate and ethical carcinogenicity predictions in drug development and agrochemicals.

Keywords:
3RsNAMscarcinogenicityrisk assessment

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Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo
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Evaluating the Effectiveness of Cancer Drug Sensitization In Vitro and In Vivo

Published on: February 6, 2015

Area of Science:

  • Toxicologic pathology
  • Carcinogenicity assessment
  • Drug development

Background:

  • The standard two-year rodent cancer bioassay for agrochemicals faces ethical and scientific challenges.
  • There is a growing need for alternative methods with reduced or no animal usage.
  • Current methods for carcinogenicity evaluation require significant ethical and scientific debate.

Purpose of the Study:

  • To explore innovative strategies for assessing carcinogenic risks.
  • To discuss new approach methodologies (NAMs) for carcinogenicity evaluation.
  • To improve the accuracy and reliability of carcinogenicity predictions.

Main Methods:

  • Review of cutting-edge methodologies presented at the 2nd Joint BSTP/ESTP Toxicologic Pathology Congress.
  • Discussion of alternative approaches to traditional rodent bioassays.
  • Focus on methods applicable to drug development and agrochemicals.

Main Results:

  • The session highlighted five key presentations on novel carcinogenicity assessment techniques.
  • Exploration of methods aiming to reduce or replace animal testing.
  • Emphasis on enhancing the predictive accuracy of carcinogenicity evaluations.

Conclusions:

  • Innovative methodologies offer promising alternatives to traditional carcinogenicity testing.
  • Advancements in toxicologic pathology are crucial for ethical and reliable risk assessment.
  • The field is moving towards more predictive and animal-sparing approaches in carcinogenicity evaluation.