Tumor size Lymph nodes metastasis rate (%) Differentiated Undifferentiated ＜2.0 cm 7.7(1/13) 21.7(5/23) 2.0-2.9 cm 11.1(2/18) 35.3(6/17) ≥ 3.0 cm 39.1(9/23) 81.3(13/16)

Table 4: Comparison of lymph nodes metastasis rate between differentiated and undifferentiated EGC in 110cases with tumor invasion in the submucosa.