CYP27B1 and non-small cell lung carcinoma: The rs4646536, rs3782130, rs10877012, and rs703842 SNPs in the CYP27B1 gene, the only one capable of synthesizing the α-1-hydroxylase enzyme, which is responsible for the second hydroxylation in the vitamin D activation process, showed no statistically significant associations with the risk of NSCLC in our study.