MGMT and xeroderma pigmentosum: Additionally, O-6-methylguanine methyltransferase (MGMT) was activated (log2FC = 2.58, false discovery rate = 1.5 × 10−4), and the gene expression of xeroderma pigmentosum complementation group C (XPC), which interacts with unpaired DNA bases, was significantly upregulated (log2FC = 1.83, false discovery rate = 3.4 × 10−4).