© 2003 by Oxford University Press
Journal of the National Cancer Institute, Vol. 95, No. 11, 806-812,
June 4, 2003
© 2003 Oxford University Press
ARTICLE |
Melanocytic Nevi, Solar Keratoses, and Divergent Pathways to Cutaneous Melanoma
Affiliation of authors: Division of Population Studies and Human Genetics, Queensland Institute of Medical Research, PO Royal Brisbane Hospital, Queensland, Australia.
Correspondence to: David C. Whiteman, M.B.B.S., Ph.D., Division of Population Studies and Human Genetics, Queensland Institute of Medical Research, PO Royal Brisbane Hospital, Queensland 4029 Australia (e-mail: daveW{at}qimr.edu.au).
Background: Some melanomas form on sun-exposed body sites, whereas others do not. We previously proposed that melanomas at different body sites arise through different pathways that have different associations with melanocytic nevi and solar keratoses. We tested this hypothesis in a case–case comparative study of melanoma patients in Queensland, Australia. Methods: We randomly selected patients from among three prespecified groups reported to the population-based Queensland Cancer Registry: those with superficial spreading or nodular melanomas of the trunk (n = 154, the reference group), those with such melanomas of the head and neck (n = 77, the main comparison group), and those with lentigo maligna melanoma (LMM) (n = 75, the chronic sun-exposed group). Each participant completed a questionnaire, and a research nurse counted melanocytic nevi and solar keratoses. We calculated exposure odds ratios (ORs) and 95% confidence intervals (CIs) to quantify the association between factors of interest and each melanoma group. Results: Patients with head and neck melanomas, compared with patients with melanomas of the trunk, were statistically significantly less likely to have more than 60 nevi (OR = 0.34, 95% CI = 0.15 to 0.79) but were statistically significantly more likely to have more than 20 solar keratoses (OR = 3.61, 95% CI = 1.42 to 9.17) and also tended to have a past history of excised solar skin lesions (OR = 1.87, 95% CI = 0.89 to 3.92). Patients with LMM were also less likely than patients with truncal melanomas to have more than 60 nevi (OR = 0.32, 95% CI = 0.14 to 0.75) and tended toward more solar keratoses (OR = 2.14, 95% CI = 0.88 to 5.16). Conclusions: Prevalences of nevi and solar keratoses differ markedly between patients with head and neck melanomas or LMM and patients with melanomas of the trunk. Cutaneous melanomas may arise through two pathways, one associated with melanocyte proliferation and the other with chronic exposure to sunlight.
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Correspondence about this Article
- Re: Melanocytic Nevi, Solar Keratoses, and Divergent Pathways to Cutaneous Melanoma
- Paolo Carli and Domenico Palli
J Natl Cancer Inst 2003 95: 1801.[Extract] [Full Text] [PDF]
- RESPONSE: Re: Melanocytic Nevi, Solar Keratoses, and Divergent Pathways to Cutaneous Melanoma
- David C. Whiteman, Peter Watt, David M. Purdie, Maria Celia Hughes, Nicholas K. Hayward, and Adèle C. Green
J Natl Cancer Inst 2003 95: 1801-1802.[Extract] [Full Text] [PDF]
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