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Survival Benefit of Additional Surgery After Non-curative Endoscopic Submucosal Dissection for Early Gastric Cancer: A Propensity Score Matching Analysis

Sho Suzuki MD, PhD, Takuji Gotoda MD, PhD, Waku Hatta MD, PhD, Tsuneo Oyama MD, PhD, Noboru Kawata MD, Akiko Takahashi MD, Yoshikazu Yoshifuku MD, Shu Hoteya MD, PhD, Masahiro Nakagawa MD, PhD, Masaaki Hirano MD, PhD, Mitsuru Esaki MD, Mitsuru Matsuda MD, PhD, Ken Ohnita MD, PhD, Kohei Yamanouchi MD, PhD, Motoyuki Yoshida MD, Osamu Dohi MD, PhD, Jun Takada MD, PhD, Keiko Tanaka MD, Shinya Yamada M
Gastrointestinal Oncology
Volume 24, Issue 11 / October , 2017

Abstract

Background and Purpose

Previous studies comparing survival outcomes between patients who did and did not undergo additional surgery after non-curative endoscopic submucosal dissection (ESD) for early gastric cancer (EGC) were limited in that the baseline characteristics differed significantly between the groups. We aimed to address this limitation and compared survival outcomes between these two groups using propensity score matching analysis.

Methods

The study enrolled 1969 consecutive patients who underwent non-curative ESD for EGC between 2000 and 2011 at any of 19 institutions across Japan. Using propensity score matching analysis, patients who underwent additional surgery (n = 1064) were compared with patients who did not (n = 905). Overall survival (OS) and disease-specific survival (DSS) after ESD were compared between both groups.

Results

Propensity score matching analysis yielded 553 matched pairs and well-balanced baseline characteristics between the two groups. The 5-year OS rates were 91.0% in the additional surgery group and 75.5% in the no additional surgery group, and the 5-year DSS rates were 99.0 and 96.8%, respectively. OS and DSS in the additional surgery group were significantly higher than in the no additional surgery group (OS, p < 0.001; DSS, p = 0.013). In Cox proportional hazard analysis, additional surgery significantly reduced gastric cancer-related death after non-curative ESD for EGC (hazard ratio 0.33, 95% confidence interval 0.12–0.79, p = 0.012).

Conclusions

Our findings suggest that additional surgery reduces mortality after non-curative ESD for EGC. We recommend additional surgery for patients after non-curative ESD for EGC.

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