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Risk assessment for aflatoxin B1: a modeling approach.

A H Wu-Williams1, L Zeise, D Thomas

  • 1Reproductive and Cancer Hazard Assessment Section, Office of Environmental Health Hazard Assessment, Berkeley, California 97404.

Risk Analysis : an Official Publication of the Society for Risk Analysis
|December 1, 1992
PubMed
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Hepatitis B virus (HBV) and aflatoxin intake interact to influence primary hepatocellular carcinoma (PHC) rates. Models suggest a multiplicative or interactive effect, not purely additive, impacting aflatoxin potency estimates.

Area of Science:

  • Hepatology
  • Toxicology
  • Epidemiology

Background:

  • Hepatitis B virus (HBV) infection and aflatoxin exposure are known risk factors for primary hepatocellular carcinoma (PHC).
  • Geographic variations in PHC incidence suggest complex interactions between HBV and environmental carcinogens like aflatoxin.

Purpose of the Study:

  • To evaluate the cancer potency of aflatoxin using data from Southern Guangxi, China.
  • To investigate the interaction between HBV and aflatoxin intake in the development of PHC, exploring additive, multiplicative, and interactive models.

Main Methods:

  • Analysis of epidemiological data on HBV, aflatoxin exposure, and PHC rates from Yeh et al.
  • Application of relative and excess risk models to assess the joint effects of HBV and aflatoxin.
  • Model validation by comparing predictions with U.S. PHC incidence rates.

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Main Results:

  • Purely additive models did not adequately fit the observed PHC data.
  • Multiplicative relative risk and interactive excess risk models provided satisfactory fits to the data.
  • A significant difference in aflatoxin potency estimates was observed between the multiplicative (5.7 (mg/kg-day)-1) and interactive (45.6 mg/kg-day)-1) models.

Conclusions:

  • HBV and aflatoxin intake likely interact in a non-additive manner to increase PHC risk.
  • The choice of risk model significantly influences the estimated potency of aflatoxin.
  • Further research is needed to elucidate the precise mechanisms of HBV-aflatoxin interaction in hepatocarcinogenesis.