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Immunosuppressive therapy (IST) is administered to patients with acquired hemophilia A (AHA) to eradicate autoantibodies against coagulation factor VIII (FVIII). Data from registries previously demonstrated that IST is often complicated by adverse events, in particular infections. This pilot study was set out to assess the feasibility of reduced-intensity, risk factor-stratified IST. We followed a single-center consecutive cohort of twenty-five patients with AHA receiving IST according to a new institutional treatment standard. Based on results from a previous study, GTH-AH 01/2020, patients were stratified into "poor risk" (FVIII &lt; 1 IU/dl or inhibitor ≥ 20 Bethesda units (BU)/ml) or "good risk" (FVIII ≥ 1 IU/dl and inhibitor &lt; 20 BU/ml). Outcomes were compared between the current cohort and the GTH registry as a historic control (n = 102). Baseline characteristics of the cohort were not different from the historic control. Partial remission, defined as FVIII recovered to &gt; 50 IU/dl, was achieved by 68% of patients after a median time of 112 days, which was lower and significantly later than in the historic control (hazard ratio: 1.8, 95% confidence interval 1.2-2.8). Complete remission, overall survival, and frequency of fatal infections were not different. Grade 3 and 4 infections were more frequent. The impact of risk factors that was observed in the historic cohort was no longer apparent, as partial and complete remission and overall survival were similar in "good risk" and "poor risk" patients. In conclusion, reduced-intensity, risk factor-stratified IST is feasible in AHA but did not decrease the risk of infections and mortality in this cohort.

Reduced-intensity, risk factor–stratified immunosuppression for acquired hemophilia A: single-center observational study