The clinicopathological characteristics and genetic alterations of mucinous carcinoma of the stomach

Chien Hsun Tseng, Wen Liang Fang*, Kuo Hung Huang, Ming Huang Chen, Yee Chao, Su Shun Lo, Anna Fen Yau Li, Chew Wun Wu, Yi Ming Shyr

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Background: Mucinous gastric carcinoma (MGC) is rare and often associated with an advanced stage. The clinicopathological features and prognosis of MGC and non-MGC (NMGC) are controversial. Methods: In total, 2637 gastric cancer (GC) patients receiving curative surgery were enrolled. The clinicopathological features and genetic alterations were compared between patients with MGC and NMGC. Results: Among the 2637 GC patients, 92 (3.5%) had MGC. After propensity score matching, compared to patients with NMGC, patients with MGC had more poorly differentiated tumors, medullary stromal reaction-type tumors, tumors with infiltrating Ming's classification, diffuse-type tumors, more abnormal preoperative serum carbohydrate antigen 19-9 levels, and more advanced T categories. After propensity score matching, there were no significant differences between MGC and NMGC regarding the initial recurrence patterns, 5-year overall survival (OS), and disease-free survival (DFS) rates. Multivariate analysis demonstrated that the MGC cell type is not an independent prognostic factor of OS and DFS. No significant differences in microsatellite instability status, Epstein-Barr virus infection, Helicobacter pylori infection, or genetic mutations were observed between MGC and NMGC. The expression of programmed death-ligand 1 (PD-L1) was significantly higher in MGC than that in NMGC. MGC was diagnosed at a more advanced stage compared with NMGC. Conclusion: MGC itself was not an independent prognostic factor of worse survival. MGC was correlated with higher PD-L1 expression than NMGC, which may have a clinical impact on the treatment of MGC in the future.

Original languageEnglish
Pages (from-to)141-147
Number of pages7
JournalJournal of the Chinese Medical Association
Issue number2
StatePublished - 2020


  • Genetic alteration
  • MGC
  • NMGC
  • PD-L1


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