Fostamatinib had 46% durable response, with 73% steroid reduction, in this multicentre retrospective study of refractory wAIHA/ES. Hypertension, gastrointestinal (GI) distress and neutropenia occurred in 23%. Only one patient required drug discontinuation and one patient dose reduction. In an eight-patient subset, migration inhibitory factor (MIF) levels, naïve (CD62Lhi) T-cell and HLA-DRhi monocyte subsets each correlated with treatment response.
Keywords: autoimmune haemolytic anaemia; fostamatinib; immune cytopenias.
© 2026 The Author(s). British Journal of Haematology published by British Society for Haematology and John Wiley & Sons Ltd.