HematologySanofi

Sanofi Reports Positive ATLAS Trial Results for Fitusiran in Hemophilia A and B

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Biotechnology Media Insights

Editorial Team · May 22, 2025

Sanofi announces positive Phase 3 ATLAS trial results showing fitusiran significantly reduces bleeding rates in hemophilia A and B patients with and without inhibitors.

Hematology blood research laboratory with test tubes and analysis equipment

Sanofi today announced positive results from the Phase 3 ATLAS clinical program evaluating fitusiran in patients with hemophilia A or B with and without inhibitors. The trials demonstrated significant reductions in annualized bleeding rates compared to on-demand factor replacement therapy.

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