Graduate School;
Peking Union Medical College and Chinese Academy of Medical Sciences;
Beijing 100730;
China;
Department of Gastroenterology;
China-Japan Friendship Hospital;
Beijing 100029;
China;
Peking University China-Japan Friendship School of Clinical Medicine;
Peking University;
Beijing 100029;
China;
Tryptophan metabolism; Colorectal cancer; Kynurenine; Indoles; Microbiota; Colorectal adenoma;