DBP and pulmonary tuberculosis: This finding is comparable to that of the previously mentioned South African study that reported an association between the Gc2 genotype and TB status among Asians.25 Furthermore, a recent study in China exploring vitamin D pathway gene polymorphisms found that the DBP Gc2 genotype was associated with progression to pulmonary TB.32 Moreover, in our study, the Gc1S genotype was detected in the LTBI group.