ecrin-mdr-crcClinical2009colorectal cancer, gastric cancer, esophageal cancerColorectal Cancer, Gastric Cancer, Esophageal CancerInterventionalhttps://newmdr.ecrin.org/Study/2620522Japan6ECRIN MDRCompletedfalseClinical research of diagnosis for lymph node metastases of gastrointestinal cancer by using 5-aminolevulinic acidInterventions: Oral administration of 5-aminolevulinic acid before surgery Primary outcome(s): evaluation of the diagnosis rate of the lymph node metastasis Study Design: Single arm Non-randomized2009-06-152620522JPRN-UMIN000005080