GAD2 and type 2 diabetes mellitus: BMI – Body mass index; C-peptide – Connecting peptide; CIADM – Checkpoint inhibitor–associated diabetes mellitus; CTCAE – Common Terminology Criteria for Adverse Events; DKA – Diabetic ketoacidosis; GAD-65 – Glutamic acid decarboxylase-65 antibody; HbA1c – Glycated hemoglobin; HCO3− – Bicarbonate; ICI – Immune checkpoint inhibitor; IgG – Immunoglobulin G; irAE – Immune-related adverse event; Nil – None detected; T2DM – Type 2 diabetes mellitus; +/++/+++ – Degree of positivity for urine ketones