This highlights the critical role of ctDNA methylation markers in the surveillance and prognostication of CRC.472 Additionally, the methylation of MLH1 on shores, regardless of genetic background, was found to be independent of promoter CpG island hypermethylation and MSI status.473 There is considerable evidence of CpG island hypermethylation contributing significantly to the reduced expression of protocadherin beta 3 (PCDHB3). The gene discussed is PCDHB3; the disease is colorectal carcinoma.