KRAS and neoplasm: In our study, the percentage of the four tumor subgroups, including dMMR/KRAS mutation, dMMR/KRAS wild-type, pMMR/KRAS mutation and pMMR/KRAS wild-type tumors was 6.78%, 8.4%, 35.88%, 48.94%, respectively, which is similar to the data reported by a study from Beijing, China (Ye et al., 2015).