In a meta-analysis of 15 studies in VDR gene polymorphisms and periodontal disease, Deng et al20 reported that CP cases had a higher frequency of AA (Apa-I) and TT (Taq-I) genotype and lower frequency of bb (Bsm-I) genotype in Asians, whereas no association was found in Caucasians or in AgP cases. Here, VDR is linked to periodontal disorder.