<b><i>Introduction:</i></b> Development of immune-related adverse events (irAEs) has been associated with enhanced efficacy with the use of immune checkpoint inhibitors (ICIs). It remains unknown whether such an association exists in advanced hepatocellular carcinoma (aHCC). This study aims to evaluate the association between irAEs and ICI efficacy in patients with aHCC. <b><i>Methods:</i></b> We performed a retrospective cohort study on patients with aHCC who received at least one dose of an ICI between May 2015 and November 2019 at the National Cancer Centre Singapore. The primary study objectives were to compare the overall survival (OS) and progression-free survival (PFS) between patients with and without irAEs. Complementary multivariable landmark analyses were performed at the 6-week and 12-week landmarks. Data cutoff was December 31, 2020. <b><i>Results:</i></b> One hundred and sixty-eight patients were included. Median age was 69 years, 85.7% were male, 57.7% had hepatitis B infection, 60.7% had ECOG 0, and 78.0% had Child-Pugh A liver cirrhosis. 82.7% received ICI monotherapy, while 17.3% received ICI in combination. Development and severity of irAE were correlated with survival. The median PFS for grade ≥3 irAE versus grades 1–2 irAE versus no irAE was 8.5 versus 3.6 versus 1.3 mths (<i>p</i> &#x3c; 0.001). The median OS for grade ≥3 irAE versus grades 1–2 irAE versus no irAE was 26.9 versus 14.0 versus 4.6 mths (<i>p</i> &#x3c; 0.001). Patients with ≥2 irAEs had a significantly longer OS on multivariable analysis (adjusted hazard ratio [aHR]0.35, <i>p</i> &#x3c; 0.001). The presence of grade ≥3 irAEs was associated with a significantly longer OS on the multivariable analysis at the 6-week landmark (aHR0.34, <i>p</i> = 0.030) and 12-week landmark (aHR0.28, <i>p</i> = 0.011). The use of systemic corticosteroids in patients with irAE was associated with a trend toward a longer OS (20.7 vs. 14.3 mths, <i>p</i> = 0.064). <b><i>Conclusion:</i></b> Our study suggests that the presence of all-grade irAEs may be a potential prognostic biomarker in patients with aHCC treated with ICI. Patients with more severe irAEs and multisystem involvement have better prognosis. The prompt use of systemic corticosteroids to treat patients with irAEs is key to ensure the best long-term outcomes for these patients.

Introduction Combination therapy with immune checkpoint inhibitor (ICI) and antivascular endothelial growth factor (anti‐VEGF) is currently the first line treatment for advanced hepatocellular carcinoma (aHCC). However, there are many patients who may not be able to receive combination therapy due to underlying comorbidities or resource limitations. For these patients, systemic treatment options include single agent tyrosine kinase inhibitors (TKIs) or ICI monotherapy. However, whether an optimal sequence of systemic therapy exists remains unknown. We aim to explore the impact of sequencing of TKI and ICI therapy in terms of response rates and to examine the safety of their use in sequential order. Methods Patients with aHCC treated with both ICI and TKI between December 30, 2013 and June 13, 2018 were retrospectively identified. Patients were classified into two groups: those who received TKI in the first‐line (TKI1), followed by ICI (ICI2) and those who received ICI (ICI1) in the first‐line followed by TKI (TKI2). The primary objective of the study was to identify differences in objective response rate (ORR) and disease control rate (DCR), as evaluated based on response evaluation criteria in solid tumor v1.1 for TKI1, TKI2, ICI1, and ICI2. Secondary objectives included comparison of progression free survival (PFS) for each line of therapy, overall survival (OS) and adverse events (AEs). Results Twenty‐seven and 23 patients were classified into group 1 and 2, respectively. Objective response rates of TKI1 and TKI2 were 3.8% and 17.6%, respectively (p = .28); DCR to TKI1 versus TKI2 was 23.1% versus 35.3% (p = .49). ORRs of ICI1 and ICI2 were 8.7% and 14.3%, respectively (p = .66); DCR to ICI2 versus ICI1 was 56.5% versus 42.9% (p = .37). Median PFS was not significant between TKI1 and TKI2 (PFS 3.06 versus 1.61 months, p = .097) as well as between ICI2 and ICI1 (PFS 1.84 versus 2.37 month, p = .32). Median OS was also not significantly different between both groups (OS 20.63 versus 13.93 months, p = .20) on univariable and multivariable analysis (OS adjusted hazard ratio [HR] 2.07, 95% CI .83–5.18, p = .118). The proportion of patients who experienced adverse events of any grade was similar in both groups (TKI1 59.3% versus TKI2 52.2%; ICI1 78.3% versus ICI2 70.4%). Conclusion Our study suggests that the sequence of TKI versus ICI therapy in patients with aHCC may not matter, given similar efficacy and toxicity profile when either agent is received in the first or second‐line setting. This finding is of value in the real‐world setting, where patients may be frail or have comorbidities that render them unable to tolerate combination therapy (ICI and TKI/anti‐VEGF). For these patients, sequential exposure to both classes of drugs (ICI and TKI) may be a suitable option.