Atezolizumab (programmed cell death-ligand 1 antibody)-induced inflammation of actinic keratosis: A case report.

Atezolizumab is a programmed cell death-ligand 1 antibody that modulates the immune system response and has shown great promise in treating malignancies. Cutaneous toxicities from immune checkpoint inhibitors are the most commonly reported immune-related adverse events, although toxicities related to immunotherapy are still being characterized. Herein, we present a novel case of inflamed actinic keratoses in a patient after receiving atezolizumab therapy that resolved without requirement of dose adjustment or discontinuation of treatment.