Amyloidosis in Human Inborn Errors of Immunity Predicts Poor Prognosis.

Purpose: Chronic inflammation in inborn errors of immunity(IEI) caused by the infections or immune dysregulation is associated with the amyloid A (AA) amyloidosis development. This study aims to analyze the clinical characteristics, management strategies, and outcomes of patients with IEI complicated by AA amyloidosis, focusing on demographics, disease manifestations, treatment modalities, and survival rates.

Methods: Thirteen patients diagnosed with IEI and AA amyloidosis, along with an additional 10 patients previously reported from Türkiye, were reviewed retrospectively.

Results: The median ages at diagnosis of IEI and amyloidosis were 20 years (2-61) and 25 years (7-70), respectively. Renal (74%) and gastrointestinal involvement (44%) were the most common, followed by skin(9%), pulmonary (9%), and cardiac involvement (9%). Primary antibody deficiencies(48%), combined immunodeficiencies(31%), hyperimmunoglobulin E syndrome(9%), congenital neutropenia (4%), autoinflammatory disorders (4%), and chronic mucocutaneous candidiasis (4%) were the IEI types associated with amyloidosis. Bronchiectasis (74%) and malignancy (17%) were observed in given ratio of patients. Treatment modalities for amyloidosis include colchicine (n = 12, 52%), steroids (n = 5, 22%) and tocilizumab (n = 2, 9%) without significant benefit. Thirteen patients (57%) died with a median age of 24 years (8-45), predominantly due to sepsis (52%). Familial Mediterranean fever (FMF) gene analysis was negative in all patients except for one, who had a heterozygous MEFV gene defect (M694V).

Conclusion: AA amyloidosis in IEI is associated with severe morbidity and mortality. Early diagnosis and management of IEI are crucial to prevent amyloidosis development. However, colchicine appears ineffective once amyloidosis has occurred, highlighting the need for further research into early diagnostic biomarkers and novel treatment options.