The addition of immune checkpoint inhibitors to the armamentarium of cancer therapies has resulted in unprecedented improvement in clinical outcomes for a vast range of malignancies. Because they interfere with the physiologic function of immune checkpoints, such as programmed cell death protein 1 or cytotoxic T-lymphocyte-associated protein 4, to promote self-tolerance, these agents are associated with a unique spectrum of immune-related adverse events (irAEs). Immune-mediated endocrinopathies are among the most commonly noted irAEs. Immune-mediated diabetes is an uncommon irAE but can be associated with significant morbidity if it is not recognized and treated in a time-sensitive manner. In this manuscript, we present a case based discussion and review of the literature pertaining to immune-mediated diabetes associated with immune checkpoint blockade. KEY POINTS: Immune checkpoint inhibitor associated diabetes mellitus often resembles type 1 diabetes mellitus (DM) in its pathophysiology and clinical manifestations. However, some patients may present with type 2 DM or worsening hyperglycemia in the setting of pre-existent DM. Early recognition and management is key to preventing life-threatening events such as diabetic ketoacidosis. Endocrinology referral and interdisciplinary management should be considered for every patient to optimize glycemic control and to ensure optimal monitoring for long-term microvascular complications.
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