Proteasome inhibitor-associated thrombotic microangiopathy: a real-world retrospective and pharmacovigilance database analysis.

Abstract

Objectives: Thrombotic microangiopathy (TMA) is associated with carfilzomib, but the potential association between bortezomib or ixazomib exposure and TMA is still unknown. Besides, the knowledge of carfilzomib-induced TMA is based mainly on case reports. We aim to quantify the risk and better characterize the clinical features of proteasome inhibitor (PI)-induced TMA.

Methods: Data from 2004 to 2023 on TMA events induced by PIs were retrieved from the FDA Adverse Event Reporting System (FAERS) database and conducted disproportionality analyse. Case reports/series from 2004 to 2023 on PI-induced TMA were extracted and analyzed retrospectively.

Results: FAERS pharmacovigilance data identified 225 TMA cases across 213 individuals related to PIs therapy. PIs were significantly associated with TMA (n = 213, ROR 1.71 [1.49-1.96]; EBGM 1.70 [1.52]), and carfilzomib had the greatest proportion (58.7%) and highest positive signal values (n = 125, ROR 17.97 [15.04-21.47]; EBGM 17.49 [15.07]) of TMA. Sixty cases (median age: 63 years) from 35 studies showed evidence of TMA, with 37 (61.7%) were male. The typical initial symptoms were gastrointestinal symptoms (45.3%), fever (24.5%), fatigue/asthenia (20.8%), neurological signs (18.9%), and dyspnea (17.0%). The median time to TMA onset was 8 days. Most patients presented with hemolytic anemia (98.1%), thrombocytopenia (96.6%), and acute kidney injury (96.7%). Cessation of PIs and treatment with plasma exchange therapy (25.0%), hemodialysis (31.7%), and eculizumab (26.7%) were associated with improved hematologic outcomes (96.3%) and renal outcomes (93.3%).

Conclusion: This study identified PIs agents with significant reporting associations with TMA. A prompt diagnosis of TMA and supportive treatments are necessary for patients receiving PIs concurrent with anemia, thrombocytopenia, and acute kidney injury.