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Risk factors for cancer.

G H Lyman1

  • 1Medicine Service, H. Lee Moffitt Cancer Center, Tampa, Florida.

Primary Care
|September 1, 1992
PubMed
Summary

Cancer development is complex, involving both genetic and environmental factors that alter DNA. Understanding these multifactorial causes, including chemical exposure and radiation, is crucial for assessing human cancer risk.

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Area of Science:

  • Oncology
  • Environmental Health
  • Genetics

Background:

  • Carcinogenesis is a complex, multistep process, not simply genetic or environmental.
  • Environmental factors, including chemicals, radiation, and viruses, interact with the genome to cause cancer.
  • Inherited predispositions can amplify the effects of environmental carcinogens.

Purpose of the Study:

  • To elucidate the multifactorial nature of carcinogenesis.
  • To highlight the interplay between environmental exposures and genetic alterations in cancer development.
  • To review current understanding of chemical and radiation carcinogenesis and risk assessment.

Main Methods:

  • Epidemiologic studies to assess human cancer risk and exposure associations.
  • Analysis of genetic and phenotypic changes during tumor progression.
  • Review of laboratory and animal studies for carcinogen screening and risk prediction.

Main Results:

  • Most cancers arise from a combination of genetic and environmental influences.
  • Chemicals and ionizing radiation cause cancer by damaging DNA, with dose-dependent risk.
  • Lifestyle factors are linked to the most significant carcinogenic chemical exposures.

Conclusions:

  • Cancer etiology is multifactorial, integrating genetic susceptibility and environmental exposures.
  • Environmental carcinogens induce specific genetic changes, potentially activating oncogenes.
  • Accurate cancer risk assessment requires robust epidemiologic data and understanding of molecular mechanisms.

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