Abstract
BackgroundWe assessed whether blood cadmium levels were associated with incident lung cancer and could be used in the context of a screening program for early-stage lung cancer. Material and methodsWe measured blood cadmium levels among 205 lung cancer patients and 205 matched controls. Cases and controls were matched for sex, age and smoking history (total pack-years, years since cessation for former smokers). ResultsThe odds ratio for those in the highest quartile of cadmium level (versus lowest) was four-fold (OR = 4.41, 95 % CI:2.01–9.67, p < 0.01). The association was present in former smokers (OR = 16.8, 95 % CI:3.96−71.2, p < 0.01), but not in current smokers (OR = 1.23, 95 % CI: 0.34–4.38) or in never smokers (OR not defined). Among former smokers, the association was present in both early- and late-stage lung cancer. ConclusionBlood cadmium levels may be a marker to help with the early detection of lung cancer among former smokers.
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