Compared with the aCtrl and bCtrl groups, the mRNA and protein expression levels of ATF4, DDIT3 and IκBα in tumour were significantly increased in all SNP‐related groups (p < 0.05), except for ATF4 protein expression in the bSNP‐50 group (p > 0.05). This evidence concerns the gene NFKBIA and neoplasm.