Background and Aim
Because of their survival benefits, immune checkpoint inhibitors (ICIs) are widely administered to patients with various advancedâstage malignancies. During ICI treatment, drugâinduced liver injury (DILI) occasionally occurs. In particular, hepatic immuneârelated adverse events (irAEs) are rare but serious and fatal. In patients with hepatic irAEs, immediate steroid treatment is generally recommended; however, the risk factors for ICIâassociated DILI remain unknown. In the present study, we identified a risk factor for ICIâassociated DILI.
Methods
We retrospectively analyzed 135 patients treated with antiâprogrammed cell deathâ1 (PDâ1) antibodies, such as nivolumab and pembrolizumab, at Asahikawa Medical University Hospital. We investigated grade â„ 2 hepatotoxic AEs during antiâPDâ1 therapy, and PDâ1 inhibitorâassociated DILI was then diagnosed according to the Digestive Disease Week Japan (DDWâJ) 2004 scale. The risk factors for PDâ1 inhibitorâassociated DILI were identified by Cox hazard analysis.
Results
Thirtyâsix patients developed grade â„ 2 hepatic AEs during antiâPDâ1 therapy. Among them, eight patients were diagnosed with PDâ1 inhibitorâassociated DILI based on the DDWâJ 2004 scale. Cox hazard analysis revealed that nonâalcoholic fatty liver disease (NAFLD) was a risk factor for PDâ1 inhibitorâassociated DILI. In addition, we revealed that the outcomes of patients with the DDWâJ 2004 score = 3 were improved without steroid treatment.
Conclusions
NAFLD is a potential risk factor for PDâ1 inhibitorâassociated DILI based on the DDWâJ 2004 scale. The DDWâJ 2004 scale might be useful for determining whether steroid treatment is required in patients with PDâ1 inhibitorâassociated DILI.