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  • Title: Characteristics of insulinopenic and non insulinopenic diabetes related to immune checkpoint inhibitors: A French pharmacovigilance study.
    Author: Bastin M, Allouchery M, Sassier M, Rouby F, Eftekhari P, Lebrun-Vignes B, Andreelli F, Bihan K.
    Journal: Therapie; 2021; 76(6):695-703. PubMed ID: 33836905.
    Abstract:
    INTRODUCTION: Immune checkpoint inhibitor-induced diabetes mellitus (ICI-DM) is an immune-related adverse drug reaction (irADR). Hyperglycemia can be linked to endogenous insulin deficiency with ketoacidosis or associated with preserved beta-cell function. OBJECTIVES: We aimed to identify the characteristics of both types of ICI-DM (type 1 and type 2 DM), to improve our understanding of this irADR and its management. METHODS: Data for ICI-DM recorded in the French Pharmacovigilance Database from 2015 to October 2019 were analyzed according to the French causality assessment. RESULTS: In total, 60 subjects were included. Anti-PD1/PDL1 pathway blockade therapy (nivolumab: 61.7%+3.3% in association with ipilimumab pembrolizumab: 28.3%) was most frequently implicated in ICI-DM, but some reports involved anti-CTLA4 drug (ipilimumab: 6.7%+3.3% in association with nivolumab). One third of reports occurred within one month of the initiation of immunotherapy. Decreased insulin secretion (defined by the presence of ketone bodies) were confirmed in 80% of reports. Among them, 54% of patients met the diagnostic criteria for fulminant diabetes. Overall, 17.7% of the reports had pre-existing type 2 diabetes T2D. Four deaths due to hyperglycemia were declared, with altered insulin secretion in only two of these reports. BMI was lower in the insulinopenic group (23.4±0.7 vs. 27.9±1.6, P=0.004) and other irADRs were more frequently observed in patients with persistent insulin secretion (66.7 vs. 18.8%, P=0.02). We found no difference in age, indication or cumulative ICI dose between the two groups (with and without insulinopenia). The presence of GAD antibodies was associated with a shorter time to diabetes onset (42.6±6.1 vs. 208.1±41.6 days, P=0.029). CONCLUSIONS: ICI-DM is a rare but serious irADR triggered by all classes of immunotherapy. The observation period for ICI-DM can be shortened for patients positive for anti-GAD antibodies. Endogenous insulin deficiency did not appear to be the only mechanism involved in ICI-DM, as beta-cell function was preserved in 20% of reports. Improvements in our understanding of this complication will be required for its prevention.
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