Jo Leonardi-Bee1, Thomas Ellison, Fiona Bath-Hextall. 1. Division of Epidemiology and Public Health, UK Centre for Tobacco Control Studies, Nottingham, Englan. jo.leonardi-bee@nottingham.ac.uk
Abstract
OBJECTIVE: To perform a systematic review and meta-analysis to collate evidence of the effects of smoking on the risk of nonmelanoma skin cancer. DATA SOURCES: We searched 4 electronic databases (from inception to October 2010) and scanned the reference lists of the publications retrieved to identify eligible comparative epidemiologic studies. STUDY SELECTION: Titles, abstracts, and full text were assessed independently by 2 authors against prespecified inclusion/exclusion criteria. DATA EXTRACTION: Data were extracted and quality was assessed independently by 2 authors using the Newcastle-Ottawa Scale. DATA SYNTHESIS: Meta-analysis was performed using random-effects models. Results are presented as odds ratios (ORs) with 95% CIs. Heterogeneity was assessed using I2. Twenty-five studies were included. Smoking was significantly associated with cutaneous squamous cell carcinoma (OR, 1.52; 95% CI, 1.15-2.01; I2 = 64%; 6 studies). Smoking was not significantly associated with basal cell carcinoma (OR, 0.95; 95% CI, 0.82-1.09; I2 = 59%; 14 studies) or nonmelanoma skin cancer (OR, 0.62; 95% CI, 0.21-1.79; I2 = 34%; 2 studies). CONCLUSION: This study clearly demonstrates that smoking increases the risk of cutaneous squamous cell carcinoma; however, smoking does not appear to modify the risk of basal cell carcinoma.
OBJECTIVE: To perform a systematic review and meta-analysis to collate evidence of the effects of smoking on the risk of nonmelanoma skin cancer. DATA SOURCES: We searched 4 electronic databases (from inception to October 2010) and scanned the reference lists of the publications retrieved to identify eligible comparative epidemiologic studies. STUDY SELECTION: Titles, abstracts, and full text were assessed independently by 2 authors against prespecified inclusion/exclusion criteria. DATA EXTRACTION: Data were extracted and quality was assessed independently by 2 authors using the Newcastle-Ottawa Scale. DATA SYNTHESIS: Meta-analysis was performed using random-effects models. Results are presented as odds ratios (ORs) with 95% CIs. Heterogeneity was assessed using I2. Twenty-five studies were included. Smoking was significantly associated with cutaneous squamous cell carcinoma (OR, 1.52; 95% CI, 1.15-2.01; I2 = 64%; 6 studies). Smoking was not significantly associated with basal cell carcinoma (OR, 0.95; 95% CI, 0.82-1.09; I2 = 59%; 14 studies) or nonmelanoma skin cancer (OR, 0.62; 95% CI, 0.21-1.79; I2 = 34%; 2 studies). CONCLUSION: This study clearly demonstrates that smoking increases the risk of cutaneous squamous cell carcinoma; however, smoking does not appear to modify the risk of basal cell carcinoma.
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