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  • Title: Diabetic Ketoacidosis as a Delayed Immune-Related Event after Discontinuation of Nivolumab.
    Author: Mae S, Kuriyama A, Tachibana H.
    Journal: J Emerg Med; 2021 Mar; 60(3):342-344. PubMed ID: 33097350.
    Abstract:
    BACKGROUND: Nivolumab, an anti-programmed cell death-1 (PD-1) monoclonal antibody with immune checkpoint inhibitory activity, represents a novel treatment for several cancers. Immune checkpoint inhibitors cause side effects, known as immune-related adverse events (irAEs) or delayed immune-related events (DIRE), after immunotherapy discontinuation. Type 1 diabetes mellitus (T1DM) and diabetic ketoacidosis have been reported to develop as an irAE during the treatment with nivolumab. Here, we report on a patient who developed T1DM and diabetic ketoacidosis after discontinuation of treatment with nivolumab as a DIRE. CASE REPORT: A 59-year-old man, who received nivolumab for an alpha fetoprotein-producing gastric cancer, presented with acute fatigue 4 months after discontinuation of nivolumab. Throughout therapy with nivolumab, the patient's hemoglobin A1c (HbA1c) level was ≤ 6%. However, 1 month prior to the patient's emergency department visit, he noticed weight loss, and 3 weeks prior to that, his HbA1c was 7.1%. Urinalysis showed ketone bodies, and arterial blood gas analysis suggested metabolic acidosis with hyperglycemia (690 mg/dL), which established the diagnosis of diabetic ketoacidosis. An endogenous insulin deficiency without verifiable anti-islet autoantibodies was confirmed; the patient had a human leukocyte antigen haplotype that does not increase the risk of acute-onset T1DM. We considered that T1DM in this patient developed possibly due to nivolumab. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: This case highlights the need for clinicians to be vigilant of the fact that a history of anti-PD-1 monoclonal antibody therapy may increase the risk of diabetic ketoacidosis, whether treatment is ongoing or discontinued.
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