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Initiation and post-initiation chemopreventive effects of diallyl sulfide in esophageal carcinogenesis

M J Wargovich1, O Imada, L C Stephens

  • 1Department of Medical Oncology, University of Texas, M.D. Anderson Cancer Center, Houston 77030.

Cancer Letters
|May 30, 1992
PubMed

Insights

Diallyl sulfide (DAS), a garlic compound, effectively prevents esophageal cancer initiation in rats. However, DAS is ineffective during the post-initiation phase and does not promote cancer development.

Area of Science:

  • Oncology
  • Chemoprevention
  • Toxicology

Background:

  • Organosulfur compounds, like diallyl sulfide (DAS) from garlic, show potential anticancer properties.
  • Esophageal carcinogenesis is a complex process involving initiation and post-initiation phases.

Purpose of the Study:

  • To investigate the chemopreventive efficacy of diallyl sulfide (DAS) during different stages of esophageal cancer development.
  • To evaluate the role of DAS in both the initiation and post-initiation phases of nitrosomethylbenzylamine-induced esophageal carcinogenesis.

Main Methods:

  • Utilized a Sprague-Dawley rat model for nitrosomethylbenzylamine-induced esophageal carcinogenesis.
  • Administered diallyl sulfide (DAS) during the initiation phase (before carcinogen exposure).
  • Administered diallyl sulfide (DAS) during the post-initiation phase (after carcinogen exposure).

Main Results:

  • Diallyl sulfide (DAS) demonstrated significant inhibition of esophageal carcinogenesis when administered during the initiation phase.
  • DAS was found to be ineffective in preventing esophageal cancer when administered during the post-initiation phase.
  • Diallyl sulfide (DAS) did not promote esophageal carcinogenesis in the post-initiation phase.

Conclusions:

  • Diallyl sulfide (DAS) exhibits chemopreventive effects primarily during the initiation stage of esophageal carcinogenesis.
  • DAS is not effective as a post-initiation preventive agent but also does not act as a promoter.
  • Findings suggest a specific window of opportunity for DAS in cancer chemoprevention.

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