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Poster display session

115P - Expression of Ki-67 as a prognostic factor in patients with colorectal cancer


23 Nov 2019


Poster display session


Tumour Site

Colon and Rectal Cancer


Kuantkan Zhabagin


Annals of Oncology (2019) 30 (suppl_9): ix30-ix41. 10.1093/annonc/mdz421


K.T. Zhabagin

Author affiliations

  • Medical Director, Semey Nuclear medicine and oncology center, 071400 - Semey/KZ


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Abstract 115P


Colorectal cancer is in fourth place due to mortality worldwide. In order to improve the diagnosis of colorectal cancer, immunohistochemical studies are becoming increasingly popular. The available literature contains a number of publications devoted to the study of the prognostic value of the expression of various biomarkers. However, the value of expression levels of the proliferation marker Ki-67 in colorectal cancer remains poorly understood. In this regard, the purpose of our study was to study the clinical significance of the expression of Ki-67 as a prognostic factor in patients with colorectal cancer.


To study the clinical significance of the expression of Ki-67 as a prognostic factor in patients with colorectal cancer, we examined 201 patients with colorectal cancer who were undergoing surgical treatment in combination with chemotherapy.


A study of the proliferative activity of tumor glandular epithelial cells using patient Ki-67 proliferation marker showed that low or medium expression level (≤ 30%) was observed in 138 (68.9%) patients, while high (> 30%) - in 63 patients (31.1%). Binary logistic regression made it possible to establish links between the expression level of Ki-67 and the tumor stage, the presence of metastases in regional lymph nodes, the presence of distant metastases and the degree of tumor differentiation. In particular, patients with stage II, III, and IV stages of cancer had a higher chance of having a high level of Ki-67 expression than patients with stage I disease — 2.63, 3.16, and 3.97 times, respectively. The presence of 4 or more regional lymph nodes (N2) was accompanied by higher chances (6.6 times) to have a high level of expression of Ki-67, and the presence of distant metastases (M1) - by 1.92 times. Patients with low-differentiated cancer had a 5.1- times higher chance of being in the group with a high level of Ki-67 expression than patients with highly differentiated cancer.


The results of the research on finding the most informative and effective methods for predicting and diagnosing colorectal cancer among residents of the studied region will allow developing and introducing methods for complex primary and secondary prevention.

Clinical trial identification

Editorial acknowledgement

Legal entity responsible for the study

The author.


Has not received any funding.


The author has declared no conflicts of interest.

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