ATP5MK and periodontitis: As for MMP-8 −799 C/T polymorphism, analysis of genotypes in periodontitis and healthy control groups in the study by Chou et al. [11] showed that the −799 T allele was associated with increased risk of both AgP (adjusted OR = 1.99, p = 0.04) and CP (adjusted OR = 1.93, p = 0.007) in Asians.