Thus, we comment on AEN, APE1, ARTEMIS (DCLRE1C), EXD2, EXO1, EXOG, FAN1, FEN1, MRE11A, p53, PLD3, PDL4, POLD1, POLE, RAD9A, TREX1, TREX2, and WRN, most of them included in the recently curated list of DNA Damage Repair genes in cancer [35]. The gene discussed is TREX1; the disease is cancer.