Tumor size Lymph nodes metastasis rate (%) Differentiated Undifferentiated ＜2.0 cm 0.0(0/54) 0.0(0/22) 2.0-2.9 cm 0.0(0/15) 4.4(2/45) ≥ 3.0 cm 14.3(2/14) 27.3(3/11)

Table 3: Comparison of lymph nodes metastasis rate between differentiated and undifferentiated EGC in 161cases with tumor invasion in the mucosa.