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Chinese Journal of Colorectal Diseases(Electronic Edition) ›› 2019, Vol. 08 ›› Issue (01): 16-22. doi: 10.3877/cma.j.issn.2095-3224.2019.01.004

Special Issue:

• Original Article • Previous Articles     Next Articles

A multi-center retrospective study of MLH1 and PMS2 gene expression and clinicopathological features in 26 280 patients with colorectal cancer

Yuanyuan Zhang1, Shuangmei Zou2, Zhenning Wang3, Fanghai Han4, Lijian Xia5, Rui Zhang6, Jinlong Yu7, Xinlin Wu8, Zhixun Zhao9,(), Xishan Wang9,()   

  1. 1. Department of Medical, YiDucloud (Beijing) Technology Co., Ltd., Beijing 100091, China
    2. Department of Pathology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
    3. Department of Gastrointestinal Tumors Surgery, The First Hospital of China Medical University, Shenyang 110072, China
    4. Department of Gastrointestinal Surgery, Sun Yat-sen Memorial Hospital, Guangzhou 510120, China
    5. Department of General Surgery, ShanDong Provincial QianFoshan Hospital, Ji′nan 250014, China
    6. Department of Colorectal Surgery, LiaoNing Cancer Hospital & Institute, Shenyang 110042, China
    7. Department of General Surgery, ZhuJiang Hospital of Southern Medical University, Guangzhou 510280, China
    8. Department of Gastrointestinal Surgery, The Affiliated Hospital of Inner Mongolia Medical University, Hohehot 010050, China
    9. Department of Colorectal Surgery, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
  • Received:2018-11-27 Online:2019-02-25 Published:2019-02-25
  • Contact: Zhixun Zhao, Xishan Wang
  • About author:
    Corresponding author: Zhao Zhixun, Email: ;
    Wang Xishan, Email:

Abstract:

Objective

To study the expression of MLH1 and PMS2 proteins and the characteristics of clinicopathological features.

Methods

A total of 205 071 patients with colorectal cancer data from 7 hospitals including the Chinese Academy of Medical Sciences Cancer Hospital from January 2010 to December 2018 were included in the study. 26 280 immunohistochemical information and case information met the research criteria. The relationship between MLH1 and PMS2 gene protein expression and age, sex, tumor size, pathological stage and other factors were analyzed.

Results

The MLH1 deletion rate was 4%, and the PMS2 deletion rate was 3.25%. There was a statistically significant difference in the ratio of male to female in the two patients with loss of protein expression (both P<0.001), and the age of onset was smaller than that in the normal expression group (both P<0.001). The incidence of the second primary cancer was also higher than that of the normal expression group (both P<0.001). The maximal tumor diameter of patients with MLH1 and PMS2 protein expression was greater than that of the normal expression group (all P<0.001), and the total number of lymph nodes cleared was also higher than the normal expression group (both P<0.001). In addition, the MLH1 expression-deficient group showed a clear tendency to familial aggregation compared to the normal group (P=0.001). At the site, the incidence of MLH1 and PMS2 protein deletions in the right colon was higher than in the normal expression group. In terms of tumor stage, the T stage of MLH1 and PMS2 protein was significantly different between the expression loss group and the normal group (P<0.001). In the M stage, the distant metastasis rate of patients with PMS2 protein deletion was lower than that of the normal group (P<0.001).

Conclusion

Patients with loss of MLH1 and PMS2 expression have earlier onset age, larger tumor volume, higher proportion of right colon, higher incidence of second primary cancer, higher number of lymph node dissection, and pathological staging. There is a close correlation.

Key words: Colorectal neoplasms, Mismatch repair gene, MLH1, PMS2, Multicenter study, Big data platform

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