Promising drug may tame rare blood disorder flares

NCT ID NCT04191304

First seen Jan 06, 2026 · Last updated May 06, 2026 · Updated 25 times

Summary

This study tests whether the drug benralizumab can prevent or delay flare-ups in people with hypereosinophilic syndrome (HES), a rare condition where too many eosinophils (a type of white blood cell) cause damage to organs. About 134 participants aged 12 and older will receive either benralizumab or a placebo every 4 weeks for 24 weeks, alongside their usual treatments. After that, everyone can receive benralizumab in an open-label extension. The main goal is to see if the drug reduces the time to the first HES flare.

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Contacts and locations

Locations

  • Research Site

    La Jolla, California, 92037, United States

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    Atlanta, Georgia, 30324, United States

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    Bethesda, Maryland, 20892, United States

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    Ann Arbor, Michigan, 48105, United States

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    Durham, North Carolina, 27705, United States

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    Cleveland, Ohio, 44106, United States

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    Columbus, Ohio, 43212, United States

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    Salt Lake City, Utah, 84112, United States

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    Rosario, 2000, Argentina

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    Innsbruck, 6020, Austria

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    Brussels, 1070, Belgium

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    Edegem, 2650, Belgium

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    Chengdu, 610041, China

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    Tianjin, 300020, China

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    Xiamen, 361015, China

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    Zhengzhou, 450008, China

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    København Ø, 2100, Denmark

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    Lille, 59037, France

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    Pessac, 33604, France

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    Strasbourg, 67091, France

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    Suresnes, 92151, France

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    Toulouse, 31059, France

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    Hanover, 30625, Germany

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    Kirchheim, 73230, Germany

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    Mannheim, 68167, Germany

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    Ahmedabad, 380013, India

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    Ajmer, 305001, India

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    Delhi, 110029, India

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    Haifa, 34362, Israel

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    Holon, 58100, Israel

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    Jerusalem, 91120, Israel

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    Kfar Saba, 44218, Israel

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    Petah Tikva, 49100, Israel

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    Ramat Gan, 5265601, Israel

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    Rehovot, 76100, Israel

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    Tel Aviv, 64239, Israel

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    Bologna, 40138, Italy

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    Chiba, 260-0852, Japan

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    Hamamatsu, 431-3192, Japan

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    Ichikawa-shi, 272-8516, Japan

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    Kawasaki-shi, 211-8510, Japan

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    Nishinomiya-shi, 663-8501, Japan

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    Osaka, 530-8480, Japan

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    Sendai, 980-8574, Japan

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    Rotterdam, 3015 GD, Netherlands

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    Chęciny, 26-060, Poland

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    Gdansk, 80-214, Poland

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    Lodz, 90-153, Poland

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    Seoul, 5505, South Korea

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    Santander, 39010, Spain

  • Research Site

    London, W2 1NY, United Kingdom

Conditions

Explore the condition pages connected to this study.