This study aims to develop evidence-based gastric cancer treatment guidelines that can provide the standard of gastric cancer therapy in accordance with the medical reality in South Korea.
 This guideline was prepared in an integrated and comprehensive manner through an interdisciplinary approach that included the Korean Gastric Cancer Association (KGCA), the Korean Society of Medical Oncology (KSMO), the Korean Society of Gastroenterology (KSG), the Korean Society for Radiation Oncology (KOSRO), and the Korean Society of Pathologists (KSP), along with the participation of experts in the methodology of guideline development (National Evidence-based Healthcare Collaborating Agency). To complete this guideline, the Guideline Committee of the KGCA established the Development Working Group and Review Panel for Korean Practice Guidelines for Gastric Cancer 2018. This guideline will be revised every 3 to 5 years when there is solid evidence that can a?ect the outcomes of patients with gastric cancer.
 This guideline is intended to help medical sta?s and educate training physicians at secondary and tertiary care medical institutions, including endoscopists, surgeons, medical oncologists, radiology oncologists, and pathologists. Furthermore, it is intended for widespread adoption to increase the standard of gastric cancer treatment, thereby contributing to improving patient quality of life as well as national health care.