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

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    Authors
    Ghiasvand, R
    Robsahm, TE
    Green, Adèle C
    Rueegg, CS
    Weiderpass, E
    Lund, E
    Veierod, MB
    Affiliation
    Oslo Centre for Biostatistics and Epidemiology, Department of Biostatistics, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
    Issue Date
    2018
    
    Metadata
    Show full item record
    Abstract
    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.
    Citation
    Ghiasvand R, Robsahm TE, Green AC, Rueegg CS, Weiderpass E, Lund E, et al. Association of phenotypic characteristics and UV radiation exposure with risk of melanoma on different body sites. JAMA Dermatol. 2018 Nov 21.
    Journal
    JAMA Dermatol
    URI
    http://hdl.handle.net/10541/621379
    DOI
    10.1001/jamadermatol.2018.3964
    PubMed ID
    30477003
    Additional Links
    https://dx.doi.org/10.1001/jamadermatol.2018.3964
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1001/jamadermatol.2018.3964
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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