Group-specific component and 25-hydroxylase gene polymorphisms in nasopharyngeal carcinoma: Associations with susceptibility and radiotherapy response

Figure 2 Stratified analysis of gene polymorphisms and nasopharyngeal carcinoma risk/radiotherapy response by serum 25-hydroxyvitamin D levels. A: The association between the group-specific component gene rs4588 TT genotype and nasopharyngeal carcinoma risk was significant only in the subgroup with serum 25-hydroxyvitamin D [25(OH)D] levels > 50 nmol/L [odds ratio (OR) = 2.15, 95%CI: 1.32-3.51, P = 0.002]; B: The association between the 25-hydroxylase gene rs12794714 AA genotype and radiotherapy resistance was significant only in the subgroup with serum 25(OH)D levels > 50 nmol/L (OR = 2.43, 95%CI: 1.45-4.08, P < 0.001). AUC: Area under the curve; CYP2R1: 25-hydroxylase; GC: Group-specific component; ROC: Receiver operating characteristic; 25(OH)D: 25-hydroxyvitamin D.