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Related Experiment Video

Updated: Jun 20, 2026

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Intravenous Endotoxin Challenge in Healthy Humans: An Experimental Platform to Investigate and Modulate Systemic Inflammation

Published on: May 16, 2016

Endotoxin and cancer.

Jessica I Lundin¹, Harvey Checkoway

¹Department of Environmental and Occupational Health Sciences, University of Washington School of Public Health, 1959 NE Pacific St., Seattle, WA 98195, USA. jlundin2@ u.washington.edu

Environmental Health Perspectives

|September 15, 2009

Summary

Exposure to endotoxin, a component of gram-negative bacteria, may prevent cancer initiation and limit tumor growth. While not yet recommended as a cancer-chemopreventive agent, further research into endotoxin

Keywords:

LPS cancer carcinogenesis endotoxin epidemiology lipopolysaccharide lung cancer occupational epidemiology

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Published on: May 16, 2016

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Published on: January 3, 2012

Area of Science:

Environmental Health
Immunology
Oncology

Background:

Endotoxin, a component of gram-negative bacterial cell walls, is prevalent in occupational and ambient environments.
It is a potent inflammagen causing various acute health effects.
Paradoxically, evidence suggests endotoxin may inhibit cancer initiation and tumor growth, echoing early 19th-century observations.

Purpose of the Study:

To review epidemiologic, clinical, and experimental evidence supporting the hypothesis that endotoxin possesses anticarcinogenic properties.
To explore potential biological mechanisms underlying endotoxin's anti-cancer effects.

Main Methods:

Review of epidemiologic studies, particularly in endotoxin-exposed occupational groups (e.g., cotton textile workers).
Analysis of experimental animal toxicology research.
Examination of limited clinical trials in cancer patients.

Main Results:

Consistent findings from occupational studies since the 1970s show reduced lung cancer risks in endotoxin-exposed individuals.
Experimental data and some clinical trials provide additional support for endotoxin's potential to prevent cancer.
Proposed mechanisms involve immune cell recruitment and activation of inflammatory mediators like TNF-alpha and interleukins.

Conclusions:

Current evidence is insufficient to recommend endotoxin as a cancer-chemopreventive agent.
Further research is needed to elucidate dose-effect and exposure-timing relationships.
Clarifying these aspects could yield significant public health and biomedical benefits.