34,46,48 Aberrant retention of presumed mutant nuclear p53 was rarely observed in the present series, although it occurred more frequently in serrated polyps with dysplasia (12%) than in adenomas (1%). One of the polyps with aberrant expression of p53 was a mixed polyp with BRAF mutation (Figure 1B). Had it not been removed, this polyp may have progressed within a short time frame to the subset of CRC with BRAF mutation, DNA methylation, TP53 mutation and DNA microsatellite stable status (a ‘fusion’ pathway shown in Table 3).49,50. The gene discussed is BRAF; the disease is adenoma.