Several genome-wide association studies (GWAS) also identified that certain chromosomal regions and candidate genes such as glycophorin A (GYPA), hedgehog interacting protein (HHIP), and family with sequence similarity 13 member A (FAM13A) were associated with the susceptibility to both COPD and lung cancer [72,73,74,75,76]. This evidence concerns the gene HHIP and lung cancer.