RSS-Feed abonnieren
DOI: 10.1055/s-2007-966750
© Georg Thieme Verlag KG Stuttgart · New York
Factors related to lymph node metastasis and the feasibility of endoscopic mucosal resection for treating poorly differentiated adenocarcinoma of the stomach
Publikationsverlauf
submitted 18 October 2006
accepted after revision 26 June 2007
Publikationsdatum:
21. Januar 2008 (online)
![](https://www.thieme-connect.de/media/endoscopy/200801/lookinside/thumbnails/10.1055-s-2007-966750-1.jpg)
Background and aim: Endoscopic mucosal resection (EMR) is currently not accepted as an alternative treatment to surgery in early gastric cancer (EGC) of the undifferentiated histologic type. The present retrospective analysis examined the correlation of various histologic factors with the presence of lymph node metastasis (LNM).
Patients and methods: A retrospective analysis on 234 patients with poorly differentiated EGC who underwent radical gastrectomy with D2 lymph node dissection was undertaken. Several clinicopathologic factors were investigated to identify predictive factors for LNM: age, sex, type of operation, tumor location, tumor size, gross type, ulceration, lymphatic invasion, and depth of invasion.
Results: Of the 234 lesions with poorly differentiated EGC, half (n = 116) already showed submucosal invasion in the resection specimen; 25.9 % of those (30/116) were limited to the upper third (SM1). Of the lesions confined to the mucosa, LNM was found in 3.4 % (4/118). With minor submucosal infiltration (SM1), the LNM rate was lower (0/30) in our patient population. Only with SM2/3 infiltration did the LNM rate sharply rise to around 30 %. The cut-off for submucosal infiltration depth was 500 μm (0/32 LNM), above which LNM rates were substantial (31.2 %; 24/77). There was limited correlation between the SM1-3 classification and actual measurement of submucosal infiltration depth. In a multivariate analysis, tumor size (P = 0.033), depth of invasion (P = 0.004), and lymphatic invasion (P < 0.001) were associated with LNM.
Conclusion: Poorly differentiated EGC confined to the mucosa or with minimal submucosal infiltration (≤ 500 μm) could be considered for curative EMR due to the low risk of LNM. Given the limited case number of subgroups, these findings should be confirmed by more data from other centers, which should also focus on local recurrence after EMR in poorly differentiated EGC.
References
- 1 Ono H, Kondo H, Gotoda T. et al . Endoscopic mucosal resection for treatment of early gastric cancer. Gut. 2001; 48 225-229
- 2 Gotoda T, Yanagisawa A, Sasako M. et al . Incidence of lymph node metastasis from early gastric cancer: estimation with a large number of cases at two large centers. Gastric Cancer. 2000; 3 219-225
- 3 Abe N, Watanabe T, Sugiyama M. et al . Endoscopic treatment or surgery for undifferentiated early gastric cancer?. Am J Surg. 2004; 188 181-184
- 4 Abe N, Watanabe T, Suzuki K. et al . Risk factors predictive of lymph node metastasis in depressed early gastric cancer. Am J Surg. 2002; 183 168-172
- 5 Yamao T, Shirao K, Ono H. et al . Risk factors for lymph node metastasis from intramucosal gastric carcinoma. Cancer. 1996; 77 602-606
- 6 Sano T, Kobori O, Muto T. Lymph node metastasis from early gastric cancer: endoscopic resection of tumour. Br J Surg. 1992; 79 241-244
- 7 Maehara Y, Orita H, Okuyama T. et al . Predictors of lymph node metastasis in early gastric cancer. Br J Surg. 1992; 79 245-247
- 8 Association JGC . Japanese Classification of Gastric Carcinoma. 2nd English Ed. Gastric Cancer. 1998; 1 10-24
- 9 Yano H, Kimura Y, Iwazawa T, Monden T. Laparoscopic management for local recurrence of early gastric cancer after endoscopic mucosal resection. Surg Endosc. 2005; 19 981-985
- 10 Korea Gastric Cancer Association . Nationwide Gastric Cancer Report in Korea. J Korean Gastric Cancer Assoc. 2002; 2 105-114
- 11 Gotoda T, Kondo H, Ono H. et al . A new endoscopic mucosal resection procedure using an insulation-tipped electrosurgical knife for rectal flat lesions: report of two cases. Gastrointest Endosc. 1999; 50 560-563
- 12 Tada M, Murakami A, Karita M, Yanai H, Okita K. Endoscopic resection of early gastric cancer. Endoscopy. 1993; 25 445-450
- 13 Park D J, Lee H K, Lee H J. et al . Lymph node metastasis in early gastric cancer with submucosal invasion: feasibility of minimally invasive surgery. World J Gastroenterol. 2004; 10 3549-3552
- 14 Miyata M, Yokoyama Y, Okoyama N. et al . What are the appropriate indications for endoscopic mucosal resection for early gastric cancer? Analysis of 256 endoscopically resected lesions. Endoscopy. 2000; 32 773-778
S. W. Jeon, MD
Department of Internal Medicine, Kyungpook National University Hospital
50, Samduk 2-Ga
Chung-Gu Daegu 700-721
South Korea
Fax: +82-53-426-8773
eMail: sw-jeon@hanmail.net