Pembrolizumab Induced Acute Kidney Injury and Liver Injury in a Patient with Malignant Melanoma.

Immune checkpoint inhibitors (ICIs) have recently gained recognition as valuable treatment options for a variety of cancers. Pembrolizumab is a monoclonal antibody that acts as an inhibitor of programmed cell death receptor-1 (PD-1). This helps release host T-cells from regulatory inhibition by tumor neoantigens, therefore mediating antitumor effects. Pembrolizumab has been approved for a variety of cancers including melanoma, head and neck squamous cell carcinoma, non-small cell lung cancer, and urothelial cell carcinoma. It has also recently gained attention for possible use in hepatocellular carcinoma and triple negative breast cancer. Although efficacious, ICIs manifest a unique set of immune-related adverse effects (irAEs) including acute kidney injury (AKI) and acute liver injury (ALI) of which the mechanism is poorly understood. While these irAEs have been described previously in literature individually, there is a paucity of literature describing their simultaneous occurence. With the growing incorporation of ICIs in oncological regimens, it is important to characterize the presentation of irAEs to facilitate earlier recognition and intervention to avoid further complications. We present a case of a 60-year-old male who presented with concurrent AKI and ALI secondary to pembrolizumab therapy for advanced metastatic melanoma. To the authors' knowledge, this is the first reported incident in literature of AKI and ALI occurring simultaneously secondary to ICI immunotherapy with pembrolizumab, although each have been reported and characterized individually.