Between two histological subtypes, no difference was observed in the expression of XRCC6, PRKDC, LIG4, and PAXX, while expression of XRCC5, XRCC4, and NHEJ1 was higher in adenocarcinoma compared to mucinous adenocarcinoma (Figure 3A). This evidence concerns the gene NHEJ1 and mucinous adenocarcinoma.