Background Anti-cytotoxic T-lymphocyte antigen-4 antibody (CTLA-4-Ab) monotherapy induces two types of pituitary immunerelated adverse events (irAEs): multiple pituitary hormone deficiency (Multi-D; impairment of ≥2 anterior pituitary hormones) and isolated adrenocorticotropic hormone (ACTH) deficiency (IAD). Combination therapy with CTLA-4-Ab and anti-programmed cell death-1 antibody (PD-1/CTLA-4-Abs), which is increasingly replacing CTLA-4-Ab monotherapy, frequently causes pituitary irAEs; however, whether it increases Multi-D/IAD incidence is unknown.
Methods In total, 74 and 748 patients with malignancies treated with PD-1/CTLA-4-Abs and PD-1-Ab, respectively, were prospectively evaluated for ACTH and cortisol levels at baseline and every 6 weeks after treatment initiation, and then observed until the last clinical visit. The characteristics of pituitary irAEs were evaluated by pituitary stimulation tests and compared with those induced by PD-1-Ab monotherapy.
Results PD-1/CTLA-4-Abs therapy showed higher incidence rates of pituitary irAEs (16/74 [21.6%] vs. 25/748 [3.3%], P<0.001), Multi-D (9/74 [12.2%] vs. 2/748 [0.3%], P<0.001), and IAD (7/74 [9.5%] vs. 23/748 [3.1%], P=0.014) than PD-1-Ab monotherapy. ACTH deficiency was observed in all cases, whereas the prevalence rates of luteinizing hormone deficiency (8/16 [50.0%] vs. 1/25 [4.0%]), follicle-stimulating hormone deficiency (6/16 [37.5%] vs. 1/25 [4.0%]), and thyrotropin deficiency (4/16 [25.0%] vs. 0/25 [0%]) were significantly higher after PD-1/CTLA-4-Abs than after PD-1-Ab treatment. Pituitary enlargement, which was observed only in the Multi-D cases, was significantly more frequent after PD-1/CTLA-4-Abs than after PD-1-Ab treatment (6/16 [37.5%] vs. 0/25 [0%], P=0.002).
Conclusion This prospective study revealed high risks of both Multi-D and IAD under PD-1/CTLA-4-Abs treatment, emphasizing the need for careful evaluation of pituitary function.
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Background Type 1 diabetes mellitus induced by immune-checkpoint inhibitors (ICI-T1DM) is a rare critical entity. However, the etiology of ICI-T1DM remains unclear.
Methods In order to elucidate risk factors for ICI-T1DM, we evaluated the clinical course and immunological status of patients with ICI-T1DM who had been diagnosed during 2016 to 2021.
Results Seven of 871 (0.8%, six men and one woman) patients developed ICI-T1DM. We revealed that the allele frequencies of human leukocyte antigen (HLA)-DPA1*02:02 and DPB1*05:01 were significantly higher in the patients with ICI-T1DM In comparison to the controls who received ICI (11/14 vs. 10/26, P=0.022; 11/14 vs. 7/26, P=0.0027, respectively). HLA-DRB1*04:05, which has been found to be a T1DM susceptibility allele in Asians, was also observed as a high-risk allele for ICI-T1DM. The significance of the HLA-DPB1*05:01 and DRB1*04:05 alleles was confirmed by an analysis of four additional patients. The absolute/relative neutrophil count, neutrophils-lymphocyte ratio, and neutrophil-eosinophil ratio increased, and the absolute lymphocyte count and absolute/relative eosinophil count decreased at the onset as compared with 6 weeks before. In two patients, alterations in cytokines and chemokines were found at the onset.
Conclusion Novel high-risk HLA alleles and haplotypes were identified in ICI-T1DM, and peripheral blood factors may be utilized as biomarkers.
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Immune-related adverse events (irAEs) affecting the endocrine glands are among the most frequent irAEs induced by immune checkpoint inhibitors (ICIs) and include hypopituitarism, primary adrenal insufficiency, thyrotoxicosis, hypothyroidism, hypoparathyroidism, and type 1 diabetes mellitus. Since the incidence and clinical features of endocrine irAEs vary according to the ICI used, it is important to understand the characteristics of these irAEs and to manage each one appropriately. Since some endocrine irAEs, including adrenal crisis and diabetic ketoacidosis, are potentially life-threatening, predicting the risk of endocrine irAEs before their onset is critical. Several autoantibodies have been detected in patients who develop endocrine irAEs, among which anti-thyroid antibodies may be predictive biomarkers of thyroid dysfunction. In this review, we describe the clinical features of each endocrine irAE induced by ICIs and discuss their potential biomarkers, including autoantibodies.
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