KRAS is mutated in 41–100% of appendiceal mucinous adenomas (Szych et al. 1999; Zauber et al. 2011; Yantiss et al. 2007; Tsai et al. 2019; Liao et al. 2020; Yanai et al. 2020). This evidence concerns the gene KRAS and mucinous cystadenoma.