Clinicopathological and treatment related factors between the LSG and SSG.

#SSG: small size group; LSG: large size group.*T1: tumor has invaded the mucosa or submucosa layer; T2: tumor has invaded the muscular layer or the subserosa; T3: tumor has invaded the serosa or penetrating serosa; T4: tumor invaded adjacent organs.+N0: no regional lymph node metastasis; N1: 1–2 regional lymph node metastasis; N2: 3–6 regional lymph node metastasis; and N3a: 7–15 regional lymph node metastasis; N3b: ≥15 regional lymph node metastasis.