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Background: Adjuvant therapy is used to reduce the risk of hepatocellular carcinoma (HCC) recurrence and improve patient prognosis. Exploration of treatment strategies that are both efficacious and safe has been extensively performed in the recent years. Although donafenib has demonstrated good efficacy in the treatment of advanced HCC, its use as adjuvant therapy in HCC has not been reported. Objectives: To investigate the efficacy and safety of postoperative adjuvant donafenib treatment in patients with HCC at high-risk of recurrence. Design: Retrospective study. Methods: A total of 196 patients with HCC at high-risk of recurrence were included in this study. Of these, 49 received adjuvant donafenib treatment, while 147 did not. Survival outcomes and incidence of adverse events (AEs) in the donafenib-treated group were compared. Inverse probability of treatment weighting (IPTW) method was used. Results: The median follow-up duration was 21.8 months [interquartile range (IQR) 17.2–27.1]. Before IPTW, the donafenib-treated group exhibited a significantly higher 1-year recurrence-free survival (RFS) rate (83.7% versus 66.7%, p = 0.023) than the control group. Contrarily, no significant difference was observed in the 1-year overall survival (OS) rates between the two groups (97.8% versus 91.8%, p = 0.120). After IPTW, the 1-year RFS and OS rates (86.6% versus 64.8%, p = 0.004; 97.9% versus 89.5%, p = 0.043, respectively) were higher than those in the control group. Multivariate analysis revealed that postoperative adjuvant donafenib treatment was an independent protective factor for RFS. The median duration of adjuvant donafenib treatment was 13.6 (IQR, 10.7–18.1) months, with 44 patients (89.8%) experienced AEs, primarily grade 1–2 AEs. Conclusion: Postoperative adjuvant donafenib treatment effectively reduced early recurrence among patients with HCC at high-risk of recurrence, while exhibiting favorable safety and tolerability profile. However, these findings warrant further investigation. Plain language summary: Comparison of the outcomes of patients with HCC with or without donafenib after radical resection to better understand the efficacy and safety of postoperative adjuvant donafenib Why was this study done? Donafenib is the only new-generation targeted drug developed in the past 14 years that has demonstrated superior efficacy and increased safety in the first-line treatment of HCC. We aimed to explore whether postoperative adjuvant donafenib can improve the prognosis of patients with HCC at high-risk of recurrence. What did the researchers do? Medical data of patients with HCC at high-risk of recurrence who underwent radical resection at two medical centers between April 2021 and October 2022 were collected to compare long-term outcomes of patients treated with and without donafenib and explore the safety of adjuvant donafenib treatment. What did the researchers find? A total of 196 patients with HCC at high-risk of recurrence, including 49 who received adjuvant donafenib treatment and 147 who did not, were analyzed. At a median follow-up of 21.8 months, it was observed that adjuvant donafenib treatment effectively reduced early recurrence among patients with HCC at high-risk of recurrence, while exhibiting favorable safety and compliance profiles. What do the findings mean? The study provides real-world clinical empirical data on adjuvant donafenib treatment for patients with HCC at high-risk of recurrence, and these results may provide new directions for adjuvant treatment of HCC. [ABSTRACT FROM AUTHOR]