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Repair of UV light-induced DNA damage and risk of cutaneous malignant melanoma

Qingyi Wei1, Jeffrey E Lee, Jeffrey E Gershenwald

  • 1Department of Epidemiology, Unit 189, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA. qwei@mdanderson.org

Journal of the National Cancer Institute
|February 20, 2003
PubMed
Abstract

Insights

Reduced DNA repair capacity (DRC) is linked to a higher risk of cutaneous malignant melanoma (CMM). This finding suggests that impaired DNA repair may increase susceptibility to sunlight-induced CMM in the general population.

Area of Science:

  • Oncology
  • Genetics
  • Dermatology

Background:

  • The precise mechanism linking UV radiation exposure to cutaneous malignant melanoma (CMM) remains unclear.
  • Individuals with xeroderma pigmentosum exhibit high CMM incidence, suggesting a role for DNA repair capacity (DRC) in sunlight-induced CMM.
  • This study investigates the association between DRC and CMM risk in the general population.

Purpose of the Study:

  • To determine if reduced DNA repair capacity (DRC) is associated with an increased risk of cutaneous malignant melanoma (CMM).
  • To explore the relationship between DRC and susceptibility to sunlight-induced CMM.

Main Methods:

  • A hospital-based case-control study involving 312 CMM patients and 324 cancer-free controls.
  • DNA repair capacity (DRC) was measured using the host-cell reactivation assay in lymphocyte samples.
  • Data on demographics, risk factors, and tumor characteristics were collected via questionnaires and medical records.

Main Results:

  • CMM patients exhibited a statistically significant 19% lower mean DRC compared to controls (P<.001).
  • DRC at or below the median in controls was associated with a 2-fold increased risk of CMM (OR=2.02, 95% CI=1.45-2.82).
  • A significant dose-response relationship was observed between decreased DRC and increased CMM risk (P(trend)<.001).

Conclusions:

  • Reduced DNA repair capacity (DRC) is identified as an independent risk factor for cutaneous malignant melanoma (CMM).
  • Impaired DRC may contribute to an individual's susceptibility to developing CMM following sunlight exposure.

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