5Kunisaki C, Takahashi M, Nagahori Y, et al. Risk factors for lymph node metastasis in histologically poorly differentiated type early gastric cancer[J]. Endoscopy, 2009, 41(6): 498-503.
6Kim JH, Lee YC, Kim H, et al. Endoscopic resection for undifferentiated early gastric cancer[J]. Gastrointest Endosc, 2009, 69(4): e1-e9.
7Hirasawa T, Gotoda T, Miyata S, et al. Incidence of lymph node metastasis and the feasibility of endoscopic resection for undifferentiated-type early gastric cancer[J]. Gastric Cancer, 2009, 12(3) : 148- 152.
8Kang HY, Kim SG, Klm JS, et ol. Clinical outcomes of endoscopic submucosal dissection for undifferentiated early gastric cancer[J]. Surg Endosc, 2010, 24(3): 509-516.
9Wu CY, Chen JT, Chen GH, et al. Lymph node metastasis in early gastric cancer: a clinicopathological analysis[J]. Hepatogastroenterology, 2002, 49(47): 1465-1468.
10Park YD, Chung YJ, Chung HY, et al. Factors related to lymph node metastasis and the feasibility of endoscopic mucosal resection for treating poorly differentiated adenocarcinoma of the stomach[J]. Endoscopy, 2008, 40(1):7-10.
