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Pfizer Reports Positive Topline Phase 3 Results For HYMPAVZI In Hemophilia A or B With Inhibitors

By Fatima Gulzar | August 11, 2025, 8:19 PM

Pfizer Inc. (NYSE:PFE) is among the 11 Best GLP-1 and Weight Loss Stocks to Invest in. Pfizer Inc. (NYSE:PFE) reported positive topline results from its Phase 3 BASIS study, which evaluated HYMPAVZI™ (marstacimab) in patients with hemophilia A or B with inhibitors.

Pfizer Reports Positive Topline Phase 3 Results For HYMPAVZI™ In Hemophilia A or B With Inhibitors
Copyright: Kurhan / 123RF Stock Photo

The annualized bleeding rate was reduced by 93% with once-weekly subcutaneous medication as opposed to on-demand intravenous treatment (1.39 vs. 19.78; p < 0.0001). Furthermore, HYMPAVZI was superior in all secondary endpoints linked to bleeding and was usually well-tolerated; no thromboembolic events or fatalities were observed.

HYMPAVZI was investigated in 48 patients over 12 months, with a focus on a high-need population: 20% of hemophilia A and 3% of hemophilia B patients develop inhibitors that negate traditional factor replacement therapy. Pfizer Inc. (NYSE:PFE) developed the treatment, which functions by blocking the tissue factor pathway inhibitor instead of substituting FVIII or FIX. HYMPAVZI, which is administered using a pre-filled pen, provides patients with few other options with a straightforward preventative approach. Pfizer Inc. (NYSE:PFE) will begin regulatory filings after conducting a thorough data review. It is among the Best Weight Loss Stocks.

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READ NEXT: 10 High-Growth EV Stocks to Invest In and 13 Best Car Stocks to Buy in 2025.

Disclosure. None.

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