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High Ki67 expression is an independent good prognostic marker in colorectal cancer

2015/08/17 by Nathaniel Melling, Charlotte Marie Kowitz, Ronald Simon +7 · 26 citations
Medicine · Biochemistry, Genetics and Molecular Biology · #Colorectal Cancer Surgical Treatments #Wnt/β-catenin signaling in development and cancer #Colorectal Cancer Screening and Detection

paper · pdf · doi:10.1136/jclinpath-2015-202985

Abstract

AIMS: To correlate Ki67 expression with outcome in colorectal cancer (CRC). METHODS: Ki67 labelling index (Ki67LI) was analysed by immunohistochemistry on a tissue microarray containing 1800 CRCs. The results were compared with clinicopathological and molecular parameters. RESULTS: Ki67LI was considered low in 26.3%, moderate in 56.7% and high in 17.0% of 1653 interpretable CRCs. High Ki67 expression was associated with low tumour stage (p<0.0001) and nodal status (p=0.0315), but not with tumour grade (p=0.8639), histological tumour type (p=0.1542) or tumour localisation, and was an independent prognosticator of favourable survival (p=0.0121). High Ki67 expression was also significantly associated with high-level nuclear β-catenin and p53 expression (p<0.0001 and p=0.0095, respectively). CONCLUSIONS: In summary, our data show that high Ki67 expression in CRCs is associated with good clinical outcome. Ki67, p53 and β-catenin overexpression seem to be linked to CRC, and indicate a cellular state of high proliferative activity. Finally, our findings strongly argue for a clinical utility of Ki67 immunostaining as an independent prognostic biomarker in CRC.

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