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Association of phenotypic characteristics and UV radiation exposure with risk of melanoma on different body sites

Permanent lenke
https://hdl.handle.net/10037/14668
DOI
https://doi.org/10.1001/jamadermatol.2018.3964
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article.pdf (260.3Kb)
Publisher's version (PDF)
Dato
2018-09-10
Type
Journal article
Tidsskriftartikkel
Peer reviewed

Forfatter
Ghiasvand, Reza; Robsahm, Trude Eid; Green, Adele; Rueegg, Corina Silvia; Weiderpass, Elisabete; Lund, Eiliv; Veierød, Marit Bragelien
Sammendrag

Importance: Two pathways have been hypothesized for the development of cutaneous melanoma: one typically affects the head and neck, a site with chronic sun damage, and the other affects the trunk, which is less exposed to the sun. However, the possible cause of limb melanomas is less studied under this hypothesis.

Objective: To investigate the association between phenotypic characteristics, pattern of UV radiation exposure, and risk of melanoma on different body sites.

Design, Setting, and Participants: This study used data on 161 540 women with information on phenotypic characteristics and UV radiation exposure who were part of the Norwegian Women and Cancer study, a population-based prospective study established in 1991 with exposure information collected by questionnaires at baseline and every 4 to 6 years during follow-up through 2015. Data analysis was performed from October 2017 through May 2018.

Exposures: Participants reported hair color, eye color, untanned skin color, number of small symmetric and large asymmetric nevi, and freckling, as well as histories of sunburns, sunbathing vacations, and indoor tanning in childhood, adolescence, and adulthood.

Main Outcomes and Measures: The Norwegian Women and Cancer study was linked to the Cancer Registry of Norway for data on cancer diagnosis and date of death or emigration. Primary melanoma site was categorized as head and neck, trunk, upper limbs, and lower limbs.

Results: During follow-up of the 161 540 women in the study (mean age at study entry, 50 years [range, 34-70 years]; mean age at diagnosis, 60 years [range, 34-87 years]), 1374 incident cases of melanoma were diagnosed. Having large asymmetric nevi was a significant risk factor for all sites and was strongest for the lower limbs (relative risk [RR], 3.38; 95% CI, 2.62-4.38) and weakest for the upper limbs (RR, 1.96; 95% CI, 1.22-3.17; P = .02 for heterogeneity). Mean lifetime number of sunbathing vacations was significantly associated with risk of trunk melanomas (RR, 1.14; 95% CI, 1.07-1.22) and lower limb melanomas (RR, 1.12; 95% CI, 1.05-1.19) but not upper limb melanomas (RR, 0.98; 95% CI, 0.88-1.09) and head and neck melanomas (RR, 0.87; 95% CI, 0.73-1.04; P = .006 for heterogeneity). Indoor tanning was associated only with trunk melanomas (RR for the highest tertile, 1.49; 95% CI, 1.16-1.92) and lower limb melanomas (RR for the highest tertile, 1.33; 95% CI, 1.00-1.76; P = .002 for heterogeneity). Skin color, hair color, small symmetric nevi, and history of sunburns were associated with risk of melanoma on all sites.

Conclusions and Relevance: These results appear to support the hypothesis of divergent pathways to melanoma and that recreational sun exposure and indoor tanning are associated with melanoma on the lower limbs, the most common site of melanoma in women. These findings appear to have important preventive implications.

Beskrivelse
Source at https://doi.org/10.1001/jamadermatol.2018.3964.
Forlag
American Medical Association (AMA)
Sitering
Ghiasvand, R., Robsahm, T.E.., Green, A.C., Rueegg, C.S., Weiderpass, E., Lund, E. & Veierød, M.B. (2019). Association of phenotypic characteristics and UV radiation exposure with risk of melanoma on different body sites. JAMA dermatology, 155(1), 39-49. https://doi.org/10.1001/jamadermatol.2018.3964
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