Emerging Treatment Models in Rheumatology: IgG4‐Related Disease: Insights Into Human Immunology and Targeted Therapies

IgG4-related disease (IgG4-RD) is a systemic, multi-organ disorder with heterogeneous clinical features but distinctive presentations.1, 2 The classic onset of this disease is subacute, taking the form of tumor-like lesions that develop gradually. These lesions are generally identified either on physical examination (e.g., salivary gland enlargement) or imaging (e.g., a renal, lung, or pancreatic mass), frequently at a time when the patient...