TY  - JOUR
AU  - Zhang, Ying
AU  - Tan, Bingyu
AU  - Zhou, Qianying
AU  - Xu, Lixia
AU  - Zhou, Lei
PY  - 2026
TI  - Tumor-resident bacteria in gastrointestinal cancers: from regulatory mechanisms to clinical implications
JO  - Cancer Biology & Medicine
SN  - 2095-3941
SP  - 615
EP  - 636
VL  - 23
IS  - 5
AB  - The human microbiome is increasingly recognized as a key contributor to the tumor microenvironment (TME). Advances in sequencing technologies have revealed the pivotal role of intratumoral microbiota in the development of gastrointestinal cancers. This review summarizes current knowledge on the characteristics and functional mechanisms of tumor-resident bacteria in colorectal, gastric, and hepatocellular carcinoma. We describe how these microbes affect carcinogenesis and disease progression through multiple pathways, including interactions between the microbiota and the host gut barrier, tumor cells, anti-tumor immunity, and other non-cellular components of the TME. In addition, the translational potential of intratumoral microbiota as diagnostic and prognostic biomarkers, as well as the influence on therapeutic responses, is discussed. A growing understanding of tumor-microbe interactions not only deepens insight into cancer biology but also opens new directions for innovative diagnostic and therapeutic strategies, highlighting the potential of targeting the intratumoral microbiome to improve patient outcomes in gastrointestinal oncology.
UR  - https://doi.org/10.20892/j.issn.2095-3941.2025.0686
DO  - 10.20892/j.issn.2095-3941.2025.0686