e15030 Background: To verify the efficacy of Quxie Capsule in patients with metastatic colorectal cancer (mCRC). Methods: This is a update of a randomized, double-blind, placebo-controlled trial. Between April 2014 and July 2015, 121 patients were enrolled in the study. Sixty patients were eligible and randomized to the two groups at a 1:1 ratio. Treatment group received conventional therapy and Chinese herbal medicine combined with Quxie Capsule for 3 months. Control group received conventional therapy and Chinese herbal medicine combined with placebo for 3 months. Main outcome measures were overall survival (OS) and progression-free survival (PFS). As of Dec 31st 2018, one patient in the control group was still alive, and all the other patients reached the main clinical endpoint. Median follow-up time was 19.4 months. Bo Ao Tong (Beijing) Medical Technology Co. Ltd. was responsible for the protocols of blind and block randomization. Results: The median OS were 23.9 months in the treatment group [95% confidence interval (CI) 15.9–28.5] vs. 14.3 months in the control group (95% CI 11.3–21.4) (Kaplan–Meier, Log-rank P=0.032), hazard ratio (95%CI)= 0.55 (0.31, 0.95), P=0.04. In the subgroups of left-sided colon, RAS wild type, non-targeted therapy, colon cancer and ≥second-line therapy, the median OS of the treatment group and the control group were respectively: 20.9 vs 12.2m, 17.4 vs 14.4m, 20.8 vs 12.0m, 25.1 vs 18.5m, 25.1 vs 12.0m ( P=0.037, 0.019, 0.022, 0.018, 0.007). There were no significant differences between the two groups in PFS. Conclusions: Quxie Capsule showed good efficacy, can reduce the risk of death and prolong the OS of patients with mCRC. Clinical trial information: ChiCTR-IOR-16009733.