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Sunny holidays before and after melanoma diagnosis are respectively associated with lower Breslow thickness and lower relapse rates in Italy.

Gandini, Sara; De Vries, Esther; Tosti, Giulio; Botteri, Edoardo; Spadola, Giuseppe; Maisonneuve, Patrick; Martinoli, Chiara; Joosse, Arjen; Ferrucci, Pier Francesco; Baldini, Federica; Cocorocchio, Emilia; Pennacchioli, Elisabetta; Cataldo, Francesco; Bazolli, Barbara; Clerici, Alessandra; Barberis, Massimo; Bataille, Veronique; Testori, Alessandro.
PLoS One ; 8(11): e78820, 2013.
Artigo em Inglês | MEDLINE | ID: mdl-24223851

BACKGROUND:

Previous studies have reported an association between sun exposure and improved cutaneous melanoma (CM) survival. We analysed the association of UV exposure with prognostic factors and outcome in a large melanoma cohort.

METHODS:

A questionnaire was given to 289 (42%) CM patients at diagnosis (Group 1) and to 402 CM patients (58%) during follow-up (Group 2). Analyses were carried out to investigate the associations between sun exposure and melanoma prognostic factors and survival.

RESULTS:

Holidays in the sun two years before CM diagnosis were significantly associated with lower Breslow thickness (p=0.003), after multiple adjustment. Number of weeks of sunny holidays was also significantly and inversely associated with thickness in a dose-dependent manner (p=0.007). However when stratifying by gender this association was found only among women (p=0.0004) the risk of CM recurrence in both sexes was significantly lower in patients (n=271) who had holidays in the sun after diagnosis, after multiple adjustment including education HR=0.30 (95%CI0.10-0.87; p=0.03)

conclusions:

Holidays in the sun were associated with thinner melanomas in women and reduced rates of relapse in both sexes. However, these results do not prove a direct causal effect of sun exposure on survival since other confounding factors, such as vitamin D serum levels and socio-economic status, may play a role. Other factors in sun seeking individuals may also possibly affect these results.