The TERT-CLPTM1L locus for lung cancer predisposes to bronchial obstruction and emphysema

Clinical studies suggest that bronchial obstruction and emphysema increase susceptibility to lung cancer. We assessed the possibility of a common genetic origin and investigated whether the lung cancer susceptibility locus on chromosome 5p15.33 increases the risk for bronchial obstruction and emphysema. Three variants in the 5p15.33 locus encompassing the TERT and CLPTM1L genes were genotyped in 777 heavy smokers and 212 lung cancer patients. Participants underwent pulmonary function tests and computed tomography of the chest, and completed questionnaires assessing smoking behaviour. The rs31489 C-allele correlated with reduced forced expiratory volume in 1 s (p=0.006). Homozygous carriers of the rs31489 C-allele exhibited increased susceptibility to bronchial obstruction (OR 1.82, 95% CI 1.24–2.69; p=0.002). A similar association was observed for diffusing capacity of the lung for carbon monoxide (p=0.004). Consistent with this, CC-carriers had an increased risk of emphysema (OR 2.04, 95% CI 1.41–2.94; p=1.73×10−4) and displayed greater alveolar destruction. Finally, CC-carriers also had an increased risk for lung cancer (OR 1.90, 95% CI 1.21–2.99; p=0.005), and were more susceptible to developing both lung cancer and bronchial obstruction than lung cancer alone (OR 2.11, 95% CI 1.04–4.26; p=0.038). The rs31489 variant on 5p15.33 is associated with bronchial obstruction, presence and severity of emphysema, and lung cancer.

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