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Combined effects of p73 and MDM2 polymorphisms on the risk of lung cancer

Hee Jung Jun1, Sun Ha Park, Won Kee Lee

  • 1Department of Internal Medicine, Kyungpook National University Hospital, Daegu, Korea.

Molecular Carcinogenesis
|October 3, 2006
PubMed

Insights

Genetic variations in p73 and MDM2 influence lung cancer risk. Combined variant alleles of p73 and MDM2 significantly increase lung cancer risk in a Korean population, suggesting an additive effect.

Area of Science:

  • Genetics
  • Oncology
  • Molecular Biology

Background:

  • p73, a homolog of p53, regulates cell-cycle control and apoptosis.
  • MDM2 inhibits p73's transcriptional activity, impacting its function.
  • Understanding genetic predispositions to lung cancer is crucial for prevention and early detection.

Purpose of the Study:

  • To investigate the association between p73 (G4C14-to-A4T14) and MDM2 (309T > G) polymorphisms, individually and combined, with lung cancer risk.
  • To evaluate the combined effect of these polymorphisms on lung cancer risk in a Korean population.

Main Methods:

  • Case-control study involving 582 lung cancer patients and 582 healthy controls.
  • Genotyping of p73 and MDM2 polymorphisms using established methods.
  • Statistical analysis to determine odds ratios (OR) and confidence intervals (CI), adjusting for potential confounders.

Main Results:

  • p73 AT/AT and MDM2 309 GG genotypes showed a non-significant increased risk of lung cancer individually.
  • A significant, dose-dependent increase in lung cancer risk was observed with the combined presence of variant p73 and MDM2 alleles (Ptrend = 0.01).
  • Individuals with three or four variant alleles had a significantly elevated risk of lung cancer (adjusted OR = 1.74, P = 0.02).

Conclusions:

  • The study suggests an additive effect of p73 and MDM2 variant alleles on increased lung cancer risk.
  • These genetic polymorphisms may serve as potential biomarkers for lung cancer susceptibility.
  • Further research is warranted to elucidate the underlying mechanisms of this gene-gene interaction in lung carcinogenesis.

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