Donafenib combined with anti-PD-1 antibody and transarterial chemoembolization (TACE) as first-line (1L) treatment for unresectable/advanced hepatocellular carcinoma (HCC)

e16107 Background: Targeted drugs, immune checkpoint inhibitors and TACE are important non-surgical approaches to treat HCC. A triple combination of the three is under investigation. This prospective study was conducted to assess the efficacy and safety of donafenib combined with anti-PD-1 antibody and TACE as first-line treatment for unresectable or advanced HCC. Methods: Patients (pts) who had histologically or clinically confirmed HCC and with no prior systemic therapy, at least one measurable lesion per mRECIST, Child-Pugh score ≤7, and ECOG PS score 0-1 were enrolled and received donafenib 100 mg twice daily, anti-PD-1 antibody Q3W and on-demand conventional TACE. CT/MRI scans were performed every six weeks. The primary endpoint was progression-free survival (PFS). Secondary endpoints were objective response rate (ORR), disease control rate (DCR), overall survival and safety. Results: A total of 30 pts were enrolled between Dec 2021 and Nov 2022. All pts had HBV-related HCC and baseline ECOG PS score of 0. Baseline characteristics are shown in the Table. As of 6 Feb 2023, eleven pts had discontinued the triple therapy. The median follow up time was 3.6 months (range, 1.8-13.4). The median number of on-study TACE sessions was 2 (range, 1-4). Among 29 efficacy evaluable pts, five pts had disease progression and no death occurred. The median PFS was not reached (95%CI, 2.4 months -NE). The 6-month PFS rate was 69.4% (95%CI, 34.5%-84.0%). Five pts had a complete response and 13 had a partial response (responders). ORR and DCR were 62.1% (95%CI, 42.3%-79.3%) and 86.2% (95%CI, 68.3%-96.1%) per mRECIST. The median time to response was 1.3 months (95%CI, 1.1-1.6). The median duration of response was not reached (95%CI, 3.4 weeks-NE). Four pts (1 with BCLC B, 3 with BCLC C) underwent successful surgical resection after a median treatment duration of 2.9 months (range, 1.8-3.3) and no recurrence was noted with a median of 5.9 months (range, 2.8-10.2) follow-up after hepatectomy. In the safety population (n = 30), any grade and grade 3 treatment-related adverse events (TRAEs) occurred in 15 (50.0%) and 7 (23.3%) pts with no grade 4 TRAEs or toxic death. Rash was the most common grade 3 TRAE (incidence: 13.3%) and led to treatment discontinuation in one pt. Conclusions: The triple combination of donafenib plus anti-PD-1 antibody and TACE showed promising efficacy and was well tolerated in pts with unresectable or advanced HCC. Clinical trial information: NCT05262959 . [Table: see text]