O-015 - Is endoscopic submucosal dissection of superficial spreading early gastric cancer safe?

Date 04 July 2015
Event WorldGI 2015
Session Oral and LBA abstracts
Topics Gastric Cancer
Surgery and/or Radiotherapy of Cancer
Presenter H.M. Kim
Citation Annals of Oncology (2015) 26 (suppl_4): 108-116. 10.1093/annonc/mdv235
Authors H.M. Kim1, S.K. Lee2, H. Kim2, K.J. Lee1, K.H. Pak1, W.J. Hyung1, S.H. Noh2, C.B. Kim1, Y.C. Lee2
  • 1Yonsei University Wonju College of Medicine, Wonju/KR
  • 2Yonsei University College of Medicine, Seoul/KR

Abstract

Introduction

Endoscopic submucosal dissection is an alternative modality of surgery in early gastric cancer (EGC). The size of EGC is not a limitation of endoscopic treatment, but there are few data on reasonable endoscopic treatment of superficial spreading EGC. The aim of this study was to investigate the rate and risk factors of lymph node metastasis of superficial spreading EGC for establishing proper criteria of endoscopic treatment of superficial spreading EGC.

Methods

Between 2000 and 2010, the patients who received curative surgery due to early gastric cancer in Severance Hospital, Seoul, Korea were enrolled. The tumors were divided into two groups by size of 6 cm. Superficial spreading EGC was defined as the largest lesion ≥6 cm.

Results

Of 2,758 EGC lesions, 105 (3.8%) lesions had a size of ≥ 6 cm, and 2653 (96.2%) lesions had a size of <6 cm. Tumor size ≥ 6 cm had higher rate of submucosal cancer 60.0% vs. 46.1%, P = 0.005), lymphovascular invasion (25.7% vs. 12.7%, P < 0.0001), and lymph node metastasis (18.1% vs. 10.9%, P = 0.22) than <6 cm EGC. In the multivariable analysis, the odd ratio of tumor size (≥ 6 cm) was 1.28 (95% confidence interval, P = 0.388) for lymph node metastasis without statistical significance.

In 105 patients with tumor size ≥ 6 cm, the rate of lymph node metastasis was higher in submucosal cancer than in mucosal cancer (25.4% vs. 7.1%, P = 0.017). The lymph node metastasis was significantly associated with lymphovascular invasion.

Conclusion

Superficial spreading EGC (tumor size ≥ 6 cm) was not associated with an increased risk of lymph node metastasis. This finding suggests that superficial spreading EGC become a candidate of endoscopic treatment as EGC < 6 cm.