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Kaplan–Meier analysis demonstrating overall survival in the PD-1 inhibitors plus sorafenib group and the PD-1 inhibitors plus lenvatinib group in patients receiving combination therapy as first-line treatment (a) and as second- or further-line treatment (b), respectively. PD-1, programmed cell death protein-1; MTKI, multitarget tyrosine kinase inhibitor.
