| Summary: | Background: Shaoyao Ruangan mixture (SRM) has been applied clinically for more than 20 years in Zhejiang Cancer Hospital to treat patients with primary liver cancer (PLC). Intestinal microecology plays an important role in the emergence of liver diseases. This study aimed to reveal connections among SRM, intestinal microbiota and PLC, and the potential targets of SRM for liver cancer. Methods: We established a control group, a PLC model group, and a treatment group of mice to analyze the inhibitory effect of SRM on PLC and its intestinal flora target. We also evaluated drug efficacy of SRM and analyzed specific changes in intestinal flora by 16S rDNA sequencing of stools. As the serum interleukin (IL)-10 level could be an independent prognostic factor for unresectable liver cancer, we detected IL-10 levels and analyzed their association with the abundance of specific bacteria. Results: Liver tumors in the treatment group were smaller and fewer than those in the model group ( P = .046). The abundance of Bacteroides was significantly higher in the model group than that in the control group, while SRM significantly reduced the increasing abundance of Bacteroides in mice with PLC. We found that the IL-10 level was positively correlated with the abundance of Bacteroides . Conclusion: SRM can effectively inhibit the progression of PLC and increase Bacteroides abundance. In view of the association between Bacteroides and liver cancer and the significant positive correlation between Bacteroides and IL-10 levels, Bacteroides may be the target intestinal flora of SRM to inhibit PLC.
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