Japanese Gastric Cancer Treatment Guidelines 2021 (6th edition).

"Declarations Conflict of interestDr. Baba reports research grants from Chugai, Eli Lilly, and Taiho, a speaker honorarium from Chugai, Eli Lilly, Taiho, Ono, MSD, Merck, Dai-ichi Sankyo, Tsumura, Miyarisan, Yakult, Eisai, Sanofi, BMS, Novartis, Janssen, and Takeda, and participation on a data safety monitoring board of Eli Lilly, Astellas, AstraZeneca, and Dai-ichi Sankyo outside the submitted work. Dr. Terashima reports a speaker honorarium from Taiho, Chugai, Ono, BMS, Yakult, Takeda, Eli Lilly, Pfizer, Dai-ichi Sankyo, Johnson and Johnson, Medtronic Japan, Intuitive Surgical Japan, and Olympus outside the submitted work. Dr. Fujishiro reports research grants from Olympus and Fujifilm, royalties from Hoya, a speaker honorarium from Olympus and Fujifilm, patents issued from Hoya, and an unpaid directorship of Japan Gastroenterological Endoscopy Society outside the submitted work. Conflict of interest Dr. Baba reports research grants from Chugai, Eli Lilly, and Taiho, a speaker honorarium from Chugai, Eli Lilly, Taiho, Ono, MSD, Merck, Dai-ichi Sankyo, Tsumura, Miyarisan, Yakult, Eisai, Sanofi, BMS, Novartis, Janssen, and Takeda, and participation on a data safety monitoring board of Eli Lilly, Astellas, AstraZeneca, and Dai-ichi Sankyo outside the submitted work. Dr. Terashima reports a speaker honorarium from Taiho, Chugai, Ono, BMS, Yakult, Takeda, Eli Lilly, Pfizer, Dai-ichi Sankyo, Johnson and Johnson, Medtronic Japan, Intuitive Surgical Japan, and Olympus outside the submitted work. Dr. Fujishiro reports research grants from Olympus and Fujifilm, royalties from Hoya, a speaker honorarium from Olympus and Fujifilm, patents issued from Hoya, and an unpaid directorship of Japan Gastroenterological Endoscopy Society outside the submitted work."

"Declarations: Conflict of interestDr. Baba reports research grants from Chugai, Eli Lilly, and Taiho, a speaker honorarium from Chugai, Eli Lilly, Taiho, Ono, MSD, Merck, Dai-ichi Sankyo, Tsumura, Miyarisan, Yakult, Eisai, Sanofi, BMS, Novartis, Janssen, and Takeda, and participation on a data safety monitoring board of Eli Lilly, Astellas, AstraZeneca, and Dai-ichi Sankyo outside the submitted work. Dr. Terashima reports a speaker honorarium from Taiho, Chugai, Ono, BMS, Yakult, Takeda, Eli Lilly, Pfizer, Dai-ichi Sankyo, Johnson and Johnson, Medtronic Japan, Intuitive Surgical Japan, and Olympus outside the submitted work. Dr. Fujishiro reports research grants from Olympus and Fujifilm, royalties from Hoya, a speaker honorarium from Olympus and Fujifilm, patents issued from Hoya, and an unpaid directorship of Japan Gastroenterological Endoscopy Society outside the submitted work. Conflict of interest: Dr. Baba reports research grants from Chugai, Eli Lilly, and Taiho, a speaker honorarium from Chugai, Eli Lilly, Taiho, Ono, MSD, Merck, Dai-ichi Sankyo, Tsumura, Miyarisan, Yakult, Eisai, Sanofi, BMS, Novartis, Janssen, and Takeda, and participation on a data safety monitoring board of Eli Lilly, Astellas, AstraZeneca, and Dai-ichi Sankyo outside the submitted work. Dr. Terashima reports a speaker honorarium from Taiho, Chugai, Ono, BMS, Yakult, Takeda, Eli Lilly, Pfizer, Dai-ichi Sankyo, Johnson and Johnson, Medtronic Japan, Intuitive Surgical Japan, and Olympus outside the submitted work. Dr. Fujishiro reports research grants from Olympus and Fujifilm, royalties from Hoya, a speaker honorarium from Olympus and Fujifilm, patents issued from Hoya, and an unpaid directorship of Japan Gastroenterological Endoscopy Society outside the submitted work."