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A polymorphism within the mismatch repair gene predicts prognosis and adjuvant chemotherapy benefit in gastric cancer

  • Xiaohui Zhao
  • Dongfang Dai
  • Xiaoqin Li
  • Bo Shen
  • Xiaofeng Chen
  • Yongqian ShuEmail author
  • Deqiang WangEmail author
Original Article
  • 34 Downloads

Abstract

Background

Defective mismatch repair (dMMR) and microsatellite instability (MSI) correlate with gastric cancer (GC) outcome. We hypothesized that MMR genetic polymorphisms that have low-penetrant effects but may cause heterogeneous MMR capability among individuals also affect GC outcome.

Methods

The polymorphisms rs1800734 in MLH1, rs2303428 and rs3732183 in MSH2, rs735943 in EXO1, and rs11797 in TREX1 were selected and analyzed in independent discovery and validation sets that included 167 and 593 patients, respectively. MSI was determined.

Results

In both the discovery and validation sets, the rs2303428 TC + CC genotype correlated with poor overall survival (OS) in non-cardia (P < 0.05) but not in cardia GC. Multivariate models showed that for OS of patients with non-cardia GC, the rs2303428 TC + CC genotype was an independent predictor in the validation set (HR 1.54; 95% CI 1.02–2.32; P = 0.040) and had a trend to be an independent predictor in the discovery set (HR 1.70; 95% CI 0.96–3.01; P = 0.067). Furthermore, in both patient sets, fluoropyrimidines-based adjuvant chemotherapy improved OS for non-cardia patients with the rs2303428 TC + CC genotype (HR 0.14; 95% CI 0.04–0.57; P = 0.006; and HR 0.29; 95% CI 0.15-0.58; P < 0.001, respectively) but not for those with the TT genotype. The rs2303428 genotypes were not associated with MSI frequency. The rs2303428 TC + CC genotype correlated with reduced expressions for thymidylate synthetase, P-glycoprotein and ERCC1 (P < 0.05) in non-cardia GC.

Conclusions

The rs2303428 genotypes may predict prognosis and adjuvant chemotherapy benefit in non-cardia GC patients.

Keywords

Polymorphism Mismatch repair Microsatellite instability Gastric cancer Adjuvant chemotherapy 

Notes

Funding

This project was supported by grants from the National Natural Science Foundation of China (Grant numbers: 81301765 and 81672896), Key Project of Zhenjiang City for Health Science and Technology (SH2016038), and Project of Young Medical Talents in Jiangsu Province (QNRC2016829).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Human rights statement

All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions.

Informed consent

Informed consent to be included in the study, or the equivalent, was obtained from all patients.

Supplementary material

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Copyright information

© The International Gastric Cancer Association and The Japanese Gastric Cancer Association 2019

Authors and Affiliations

  1. 1.Department of Medical Oncology, The Cancer Therapy CenterAffiliated Hospital of Jiangsu UniversityZhenjiangChina
  2. 2.Department of PathologyAffiliated Hospital of Jiangsu UniversityZhenjiangChina
  3. 3.Department of Medical OncologyThe Affiliated Cancer Hospital of Nanjing Medical UniversityNanjingChina
  4. 4.Department of Medical OncologyThe First Affiliated Hospital of Nanjing Medical UniversityNanjingChina

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