R-1 Carcinomas of the Alimentary tract Esophageal Carcinoma(EC) Gastric Carcinoma(GC) Colorectal Carcinoma(CRC) carcinomas arise from superficial epithelium of mucosa or gland Histologic type squamous cell carcinoma adenocarcinoma Special type EC 90% <10%〔 in cardia) GC 10%〔 in cardia) >90% signet-ring cell carcinoma CRC <10%(anal zone) >90% mucinous adenocarcinomaCarcinomas of the Alimentary tract Esophageal Carcinoma (EC) Gastric Carcinoma (GC) Colorectal Carcinoma (CRC) carcinomas arise from superficial epithelium of mucosa or gland squamous cell carcinoma adenocarcinoma signet-ring cell carcinoma mucinous adenocarcinoma Special type Histologic type EC >90% <10% (in cardia) GC <10% (in cardia) >90% CRC <10% (anal zone) >90% R-1