SFRP2 and colorectal carcinoma: Among the 18 analysed markers (Table 1), DNA methylation was significantly (p < 0.05) altered for six loci belonging to four genes, in which COL1A2, SFRP2, SOCS3 showed hypermethylation and THBS2 showed hypomethylation both in AD and in CRC samples compared to NAT.