In our study, we found KRAS mutations in 1/4 conventional adenomas and in 1/12 serrated polyps (SSL without dysplasia, BRAF-wildtype), which is in keeping with the results of several previous studies, where the frequency of KRAS mutations in both conventional and serrated adenomas was between 8 and 10% (29–32). This evidence concerns the gene BRAF and dysplasia.