However, some tumour cells are able to repair this type of DNA damage using a repair protein O6‐alkylguanine DNA alkyltransferase, which is encoded by the O‐6‐methylguanine‐DNA methyltransferase (MGMT) gene (Kaina & Christmann, 2002; Lee, 2016; Perazzoli et al., 2015). Here, MGMT is linked to neoplasm.