Journal of Gastric Cancer

The Korean Gastric Cancer Association (대한위암학회)
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Postoperative Radiotherapy Improves Survival in Gastric Signet-Ring Cell Carcinoma: a SEER Database Analysis

  • Wei, Feng (Department of Gastroenterology, The Fifth People's Hospital of Shanghai Fudan University) ;
  • Lyu, Hongwei (Department of Gastroenterology, The Fifth People's Hospital of Shanghai Fudan University) ;
  • Wang, Shuoer (Central Laboratory, The Fifth People's Hospital of Shanghai Fudan University) ;
  • Chu, Yan (Department of Gastroenterology, The Fifth People's Hospital of Shanghai Fudan University) ;
  • Chen, Fengyuan (Department of Gastroenterology, The Fifth People's Hospital of Shanghai Fudan University)
  • Received : 2019.07.06
  • Accepted : 2019.09.26
  • Published : 2019.12.31
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Abstract

Purpose: To identify the potential therapeutic role of postoperative radiotherapy (RT) in patients with locally advanced (stage II and stage III) gastric signet ring cell carcinoma (SRC). Materials and methods: Patients with locally advanced gastric SRC from the Surveillance, Epidemiology, and End Results program database between 2004 and 2012 were included in our study. Univariate and multivariate Cox proportional models were performed, and survival curves were generated to evaluate the prognostic effect of postoperative RT and surgery alone on SRC patients. Propensity score matching (PSM) was used to avoid selection bias among the study cohorts. Results: We found that patients with postoperative RT had better probability of survival compared with those who did not receive RT (overall survival [OS], P<0.001; cancer-specific survival [CSS], P<0.001). After PSM, analysis of both overall and CSS showed that patients who underwent postoperative RT had better prognosis than those receiving surgery alone in the matched cohort (OS, P=0.00079; CSS, P=0.0036). Multivariate Cox proportional model indicated that postoperative RT had better effect on prognosis compared with surgery alone with respect to both overall (hazard ratio [HR], 0.716; 95% confidence interval [95% CI], 0.590-0.87; P=0.001) and CSS (HR, 0.713; 95% CI, 0.570-0.890; P=0.003). Conclusions: Postoperative RT had better prognosis compared with surgery alone for both overall and CSS for patients with locally advanced gastric SRC.

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References

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