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Related Experiment Videos

Oncogenes and radiation carcinogenesis.

S J Garte1, F J Burns

  • 1Department of Environmental Medicine, New York University Medical Center, NY 10016.

Environmental Health Perspectives
|June 1, 1991
PubMed
Summary

Oncogenes play a role in radiation-induced cancer and radioresistance. Gene amplification of myc occurs late in tumor progression, not as an initial radiation event.

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Area of Science:

  • Oncology
  • Radiation Biology
  • Molecular Biology

Background:

  • Oncogenes are implicated in radiation-induced carcinogenesis and cell transformation.
  • They may contribute to radioresistance in advanced tumors and human cancers from nonionizing radiation.

Purpose of the Study:

  • To investigate oncogene activation mechanisms in radiation-induced tumors.
  • To elucidate the role of specific oncogenes (K-ras, c-myc) in tumor progression using a rat skin model.

Main Methods:

  • Analysis of oncogene activation (point mutations, gene amplification, gene expression) in radiation-induced tumors.
  • Utilizing a rat skin model for ionizing radiation-induced cancer induction.
  • Examining K-ras and c-myc oncogene activation in end-stage tumors.

Main Results:

  • Concurrent activation of K-ras and c-myc oncogenes was observed in end-stage tumors.
  • Myc gene amplification was identified as a late-stage event in tumor progression.
  • Myc amplification is not an early initiating event directly caused by radiation.

Conclusions:

  • Genetic factors, tissue type, and radiation characteristics influence oncogene activation.
  • Myc gene amplification is a late event in radiation-induced carcinogenesis.
  • Tumor cell heterogeneity and tissue specificity are critical considerations in radiation oncology.

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