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Hepatocellular carcinoma (HCC) is the most common primary malignancy of the liver. The majority of patients with HCC are diagnosed with advanced-stage disease. Sorafenib is a frontline therapy drug approved by the Food and Drug Administration for advanced HCC. However, the poor aqueous solubility of sorafenib limits its applications. The present study aimed to overcome this limitation of sorafenib. Thus, bovine serum albumin (BSA)-based nanoparticles were developed to encapsulate hydrophobic sorafenib. The resultant sorafenib-loaded BSA nanoparticles (Sf-BSA-NPs) were thoroughly characterized for size distribution, encapsulation efficiency and morphology. Previous studies on HepG2 cells in vitro have demonstrated that Sf-BSA-NPs exhibit remarkable superiority to free sorafenib in cytocompatibility, cytotoxicity and proapoptotic effect. The results of the present study demonstrated that Sf-BSA-NPs were effective in improving aqueous solubility, and enhanced drug cytotoxicity, suggesting its therapeutic potential for HCC.