PCNA and carcinoma: Normal tissue is characterised by higher expression levels of ACTG2, VWF, EZR, B4GALNT2, CNN1, DES and MS4A12 and lower levels of NOX1, HDAC1, CCND1, LGR5, PCNA, CDX1, KRT18, NTN1, CDX2 and CASP3 when compared to adenomatous polyp or carcinoma tissues (Figure 1).