The expression of PLK4 in colorectal cancer and its clinical significance

蒋浩海; 肖　锋; 顾春燕

doi:10.19401/j.cnki.1007-3639.2018.09.007

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The expression of PLK4 in colorectal cancer and its clinical significance

更新时间：2026-01-27

- The expression of PLK4 in colorectal cancer and its clinical significance
- China Oncology Vol. 28, Issue 9, Pages: 686-691(2018)
- 作者机构：
  
  1. 盐城市第一人民医院普外科,江苏,盐城,224001
  2. 南通大学附属南通第三医院病理科,江苏,南通,226006
- 作者简介：
- 基金信息：
- DOI：10.19401/j.cnki.1007-3639.2018.09.007
  CLC： R735.34
- Published Online：26 October 2018，
  
  Published：26 October 2018
- 稿件说明：
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蒋浩海,肖　锋,顾春燕,等. PLK4在结直肠癌中的表达及临床意义[J]. 中国癌症杂志, 2018, 28(9): 686-691.

蒋浩海, 肖　锋, 顾春燕. The expression of PLK4 in colorectal cancer and its clinical significance[J]. China Oncology, 2018, 28(9): 686-691.
蒋浩海,肖　锋,顾春燕,等. PLK4在结直肠癌中的表达及临床意义[J]. 中国癌症杂志, 2018, 28(9): 686-691. DOI： 10.19401/j.cnki.1007-3639.2018.09.007.

蒋浩海, 肖　锋, 顾春燕. The expression of PLK4 in colorectal cancer and its clinical significance[J]. China Oncology, 2018, 28(9): 686-691. DOI： 10.19401/j.cnki.1007-3639.2018.09.007.

摘要

背景与目的：Polo样蛋白激酶4（Polo-like kinases 4，PLK4）主要参与调控中心体的复制进程，过表达PLK4能够诱导肿瘤细胞中心体扩大、染色体不稳定及肿瘤侵袭性增强。该研究旨在探讨PLK4在人结直肠癌（colorectal cancer，CRC）中的表达及临床意义。方法：收集19例CRC组织及对应癌旁组织的新鲜标本，129例CRC组织及癌旁组织的石蜡标本。应用实时荧光定量聚合酶链反应（real-time fluorescent quantitative polymerase chain reaction，RTFQ-PCR）检测19例CRC组织及对应癌旁组织中PLK4 mRNA的表达；采用免疫组织化学法检测129例CRC患者手术切除石蜡标本的PLK4蛋白的水平，分析PLK4表达与CRC临床病理指标之间的相关性及与预后的相关性。结果：RTFQ-PCR显示，PLK4 mRNA表达在CRC组织中明显高于癌旁组织（P0.01），免疫组织化学结果显示，PLK4蛋白阳性信号定位于细胞质及部分细胞核。PLK4蛋白在129例CRC组织中低表达62例，高表达67例，PLK4蛋白在CRC组织中的表达显著高于癌旁组织（P0.01），PLK4蛋白水平与CRC分化程度（P=0.001 1）、N分期（P0.000 1）、M分期（P=0.035 8）和TNM分期（P0.000 1）呈正相关。Kaplan-Meier生存曲线显示，PLK4低表达组中位生存时间为27个月，高表达组中位生存时间为12个月，组间总生存率（overall survival，OS）差异有统计学意义，PLK4高表达组OS明显低于PLK4低表达组（P0.000 1）。多因素COX比例风险模型分析显示，PLK4高表达不是CRC的独立预后因素（P=0.176）。结论：PLK4在CRC组织中高表达，并且与CRC组织分化差、淋巴结转移、远处转移及TNM分期相关；PLK4高表达提示CRC预后差，但不是独立预后因素。

Abstract

Background and purpose: Polo-like kinase 4 (PLK4) is mainly involved in regulation of the replication process of centrosome. Overexpression of PLK4 can induce the enlargement of the centrosome

cause instability of the chromosomes

and enhance tumor invasiveness. The purpose of this research was to investigate the expression of PLK4 in human colorectal cancer (CRC)

and evaluate its clinicopathological significance. Methods: Fresh tissues of 19 cases of CRC and adjacent normal tissues were collected

and paraffin specimens of 129 cases of CRC tissues and adjacent tissues were collected. PLK4 mRNA expression was measured from 19 cases of CRC and corresponding normal tissues by real-time fluorescent quantitative polymerase chain reaction (RTFQ-PCR). Immunohistochemical staining was performed to detect the PLK4 expression in 129 cases of CRC and corresponding normal tissues. The association of the PLK4 expression with clinicopathological parameters and prognostic significance was evaluated. Results: The level of PLK4 mRNA expression in CRC tissues was significant higher than in the corresponding normal tissues (P0.01). Immunohistochemical staining showed PLK4 protein was localized in cytoplasm and part of nucleus in CRC cells. In 129 cases of CRC

low expression of PLK4 protein was found in 62 cases whereas PLK4 protein was highly expressed in 67 cases. PLK4 protein expression in CRC was significantly higher than that in adjacent tissues (P0.01). There was a correlation of PLK4 expression with higher histological grading (P=0.001 1)

higher incidence of lymph node metastasis (P0.000 1)

distant metastasis (P=0.035 8) and TNM staging (P0.000 1). Kaplan-Meier survival curves showed that the median survival time was 27 months in PLK4 protein low expression group

and 12 months in PLK4 protein high expression group. Log-rank test results showed that high PLK4 expression was found to be a detrimental prognostic factor measured by overall survival (OS) (P0.000 1). Multivariate COX proportional hazards model analysis showed that PLK4 high expression was not an independent prognostic factor for CRC (P=0.176). Conclusion: PLK4 was highly expressed in CRC tissues

and was associated with poor CRC differentiation

lymph node metastasis

distant metastasis and TNM stage. The high expression of PLK4 suggests that CRC has poor prognosis

but it is not an independent prognostic factor.

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