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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...
Cancer Prevention02:59

Cancer Prevention

Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
Some...
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Cancer Survival Analysis

Cancer survival analysis focuses on quantifying and interpreting the time from a key starting point, such as diagnosis or the initiation of treatment, to a specific endpoint, such as remission or death. This analysis provides critical insights into treatment effectiveness and factors that influence patient outcomes, helping to shape clinical decisions and guide prognostic evaluations. A cornerstone of oncology research, survival analysis tackles the challenges of skewed, non-normally...
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Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
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...
Criteria for Causality: Bradford Hill Criteria - I01:30

Criteria for Causality: Bradford Hill Criteria - I

The Bradford Hill criteria are a group of principles that provide a framework to determine a causal relationship between a specific factor and a disease. There are nine criteria that are pivotal in assessing causality in epidemiological studies. Here's a closer look at Strength, Consistency, Specificity, and Temporality criteria with definitions and examples:

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Related Experiment Video

Updated: Jun 20, 2026

Implantation and Monitoring by PET/CT of an Orthotopic Model of Human Pleural Mesothelioma in Athymic Mice
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Developments in asbestos cancer risk assessment.

Michael A Silverstein1, Laura S Welch, Richard Lemen

  • 1Department of Environmental and Occupational Health Sciences, University of Washington School of Public Health, Seattle, Washington, USA. masilver@u.washington.edu

American Journal of Industrial Medicine
|September 17, 2009
PubMed
Summary

Asbestos risk assessments using statistical models have been unsuccessful due to data limitations, rendering them unsuitable for policy decisions. A ban on asbestos production and use is a more pressing priority than refining these flawed risk assessments.

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Published on: May 9, 2018

Area of Science:

  • Environmental Health
  • Occupational Health
  • Toxicology

Background:

  • For 25 years, attempts have been made to develop valid asbestos risk assessments for workplace and community cancer risks.
  • Mathematical models have been applied to epidemiology studies to understand exposure-risk relationships.
  • The U.S. Environmental Protection Agency (EPA) proposed a new risk assessment method in July 2008.

Purpose of the Study:

  • To review and evaluate asbestos risk assessments and related literature.
  • To assess the validity and utility of statistical models in asbestos risk characterization.
  • To determine the suitability of current risk assessment methods for informing health policy.

Main Methods:

  • A review of risk assessments from the U.S. Environmental Protection Agency (EPA), Occupational Safety and Health Administration (OSHA), and National Institute for Occupational Safety and Health (NIOSH) since 1972.
  • Inclusion of relevant scientific literature in the review process.

Main Results:

  • Statistical models for asbestos fiber types and sizes could not overcome exposure data limitations.
  • Resulting uncertainties in potency estimates are too significant for policy application.
  • The EPA has discontinued its proposed methods for estimating potency factors due to these limitations.

Conclusions:

  • Current statistical models for asbestos risk assessment are inadequate for driving occupational and environmental health policy.
  • Future asbestos risk assessments require new methodologies and more reliable exposure data.
  • A ban on the production and use of regulated asbestos and asbestiform fibers is a more urgent priority.