IL6 and squamous cell carcinoma: Association between IL6 promoter SNPs and squamous cell carcinoma in miners. Miners with cumulative radon exposure levels ≥ 0.895 kWLM had a statistically significant greater risk for squamous cell carcinoma than miners with < 0.895 kWLM (OR = 1.51, 95% CI: 1.05, 2.18, p = 0.026 with adjustment for rs1800797 genotype, pack-years, and age at sputum collection), consistent with radon progeny exposure as a risk factor for squamous cell carcinoma in miners.