Relationship between gastrointestinal flora and gastrointestinal neoplasms

The gastrointestinal flora is composed of a large number of microorganisms with complex structure, which participates in the process of decomposition, digestion and absorption of nutrients, promotes the development of the body′s immune system, inhibits the colonization of pathogenic bacteria, and affects the health and disease of the body. In recent years, with the advancement of sequencing technology, the relationship between gastrointestinal flora and gastrointestinal neoplasms has became a research hotspot. This article reviews the carcinogenic pathways of the gastrointestinal flora and the possible carcinogenic mechanisms of the gastrointestinal flora. Key words: Immune system; Gastrointestinal tract; Carcinoma; Gastrointestinal flora