Exploring the possibility of endoscopic submucosal dissection for clinical submucosal invasive early gastric cancers

Abstract

Background

The current standard treatment modality for clinical submucosal invasive (cT1b) early gastric cancer (EGC) is surgery. However, there are discrepancies in T staging between pre- and post-operative findings, and in cases of overestimation, patients may lose the opportunity to preserve the stomach. The aim of this study was to analyze surgical outcomes of cT1b EGC and determine the pre-treatment factors favoring ESD.

Methods

Patients who underwent gastrectomy for cT1b EGC with a tumor size of 30 mm or less in diameter and differentiated-type histology were retrospectively reviewed from January 2010 to December 2014. According to the final surgical pathologic results, two groups were classified: patients whose pathologic results qualified for current ESD indication (ESD-qualified group, n = 203) and patients whose pathologic results made them ineligible for ESD (ESD-disqualified group, n = 261). The preoperative clinical characteristics were compared.

Results

Forty-three percent of the patients (203/464) who underwent gastrectomy for cT1b EGC qualified for ESD; their endoscopic lesion tended to be smaller than 20 mm in size and located in the distal part of stomach. In addition, the ESD-qualified group showed a significantly higher proportion of well-differentiated tubular adenocarcinoma on endoscopic biopsy and of the flat/depressed type in the endoscopic evaluation.

Conclusion

Forty-three percent of the patients with cT1b EGC who underwent gastrectomy had a chance to preserve their stomach by ESD. Therefore, pre-treatment factors such as endoscopic lesion size, location, histology, and gross type should be considered for treatment modality selection for cT1b EGC.

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Correspondence to Hyunsoo Chung.

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Hyun Deok Lee, Hyunsoo Chung, Sang Gyun Kim, Jung Kim, Jue Lie Kim, Eunwoo Lee, and Hyun Chae Jung have no conflicts of interest or financial ties to disclose.

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Lee, H.D., Chung, H., Kim, S.G. et al. Exploring the possibility of endoscopic submucosal dissection for clinical submucosal invasive early gastric cancers. Surg Endosc 33, 4008–4015 (2019). https://doi.org/10.1007/s00464-019-06690-5

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Keywords

  • Clinical submucosal invasive early gastric cancer
  • Endoscopic submucosal dissection
  • Pre-treatment factors