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A Multi-cohort Study of the Prognostic Significance of Microsatellite Instability or Mismatch Repair Status after Recurrence of Resectable Gastric Cancer

 Ji Yeong An  ;  Yoon Young Choi  ;  Jeeyun Lee  ;  Woo Jin Hyung  ;  Kyoung-Mee Kim  ;  Sung Hoon Noh  ;  Min-Gew Choi  ;  Jae-Ho Cheong 
 CANCER RESEARCH AND TREATMENT, Vol.52(4) : 1153-1161, 2020-10 
Journal Title
Issue Date
Biomarker ; Microsatellite instability ; Prognosis ; Recurrence ; Stomach neoplasms
Purpose: High microsatellite instability (MSI) is related to good prognosis in gastric cancer. We aimed to identify the prognostic factors of patients with recurrent gastric cancer and investigate the role of MSI as a prognostic and predictive biomarker of survival after tumor recurrence. Materials and methods: This retrospective cohort study enrolled patients treated for stage II/III gastric cancer who developed tumor recurrence and in whom the MSI status or mismatch repair (MMR) status of the tumor was known. MSI status and the expression of MMR proteins were evaluated using polymerase chain reaction and immunohistochemical analysis, respectively. Results: Of the 790 patients included, 64 (8.1%) had high MSI status or MMR deficiency. The tumor-node-metastasis stage, type of recurrence, Lauren classification, chemotherapy after recurrence, and interval to recurrence were independently associated with survival after tumor recurrence. The MSI/MMR status and receiving adjuvant chemotherapy were not associated with survival after recurrence. In a subgroup analysis of patients with high MSI or MMR-deficient gastric cancer, those who did not receive adjuvant chemotherapy had better treatment response to chemotherapy after recurrence than those who received adjuvant chemotherapy. Conclusion: Patients with high MSI/MMR-deficient gastric cancer should be spared from adjuvant chemotherapy after surgery, but aggressive chemotherapy after recurrence should be considered. Higher tumor-node-metastasis stage, Lauren classification, interval to recurrence, and type of recurrence are associated with survival after tumor recurrence and should thus be considered when establishing a treatment plan and designing clinical trials targeting recurrent gastric cancer.
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1. College of Medicine (의과대학) > Dept. of Surgery (외과학교실) > 1. Journal Papers
Yonsei Authors
Noh, Sung Hoon(노성훈) ORCID logo https://orcid.org/0000-0003-4386-6886
Cheong, Jae Ho(정재호) ORCID logo https://orcid.org/0000-0002-1703-1781
Choi, Yoon Young(최윤영) ORCID logo https://orcid.org/0000-0002-2179-7851
Hyung, Woo Jin(형우진) ORCID logo https://orcid.org/0000-0002-8593-9214
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