Analysis of Geographic and Environmental Factors and Their Association with Cutaneous Melanoma Incidence in Canada

Author:

Berman-Rosa Melissa,Logan James,Ghazawi Feras M.ORCID,Le MichelleORCID,Conte SantinaORCID,Netchiporouk Elena,Mukovozov Ilya M.ORCID,Cyr Janelle,Mourad Ahmed,Miller Wilson H.,Claveau Joël,Salopek Thomas G.ORCID,Gniadecki RobertORCID,Sasseville DenisORCID,Rahme Elham,Lagacé François,Litvinov Ivan V.ORCID

Abstract

<b><i>Background:</i></b> Over 90% of skin cancers including cutaneous melanoma (CM) are related directly to sun exposure. Despite extensive knowledge on ultraviolet radiation’s (UVR) detrimental impact, many still fail to implement sun protection/sun avoidance. Human behavior, attitudes, and cultural norms of individuals and communities heavily depend on the surrounding climate/environment. In many instances, the climate shapes the culture/norms of the society. Canada has vast geographic/environmental differences. <b><i>Methods:</i></b> In the current ecological study, we sought to examine the relationship between various geographic and environmental factors and the distribution of CM incidence by Forward Sortation Area (FSA) postal code across Canada. CM incidence data were extracted from the Canadian Cancer Registry, while environmental data were extracted from the Canadian Urban Environmental Health Research Consortium (greenspace, as measured by the normalized difference vegetation index; annual highest temperature; absolute number and average length of yearly heat events; annual total precipitation [rain and snow]; absolute number and average length of events with precipitation [rain and snow]; and summer UVR index). The above geographic/environmental data by FSA were correlated with the respective CM incidence employing negative binomial regression model. <b><i>Results:</i></b> Our analysis highlights that increases in annual average temperature, summer UVR, and greenspace were associated with higher expected incidence of CM cases, while higher number of annual heat events together with highest annual temperature and higher average number of annual rain events were associated with a decrease in CM incidence rate. This study also highlights regional variation in environmental CM risk factors in Canada. <b><i>Conclusions:</i></b> This national population-based study presents clinically relevant conclusions on weather/geographic variations associated with CM incidence in Canada and will help refine targeted CM prevention campaigns by understanding unique weather/geographic variations in high-risk regions.

Publisher

S. Karger AG

Subject

Dermatology

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