| Summary: | Abstract Colitis‐associated bowel cancer (CAC) is one of the most common malignancies associated with inflammation. The aim of this study was to observe a new herbal formula “Xiaotan Sanjie Fang” (XTSJF) derived from the addition and subtraction theory of traditional medicine as an alternative to CAC treatment by “Daotan Decoction” and “Xiaojianzhong Decoction”, which are famous traditional Chinese medicine prescriptions for the treatment of inflammatory diseases of the digestive tract. We constructed a DMH/DSS inflammation‐associated colorectal cancer rat model and treated CAC rats with sulfasalazine and different doses of XTSJF. The results showed that the body weight of rats treated with different doses of XTSJF increased, which was still lower than that of normal rats; AFC decreased significantly compared with the model group and the positive control group, and the final dose was superior to the low dose; histological observation revealed that it could maintain the normal structure of colon tissue, while it could inhibit the secretion of VEGF, COX2, and AQP1 and the expression of pro‐inflammatory cytokines IL‐6, IL‐1β, and TNF‐α, promote the expression of caspase‐3 and BAX and inhibit the expression of Bcl‐2. Taken together, these data suggest that XTSJF can inhibit COX‐2/VEGF expression to prevent the development of inflammation‐associated colorectal cancer.
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