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New drug RAY121 tested for Long-Term control of autoimmune diseases

NCT ID NCT06723106

ENROLLING_BY_INVITATION Disease control Sponsor: Chugai Pharmaceutical Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study is a long-term extension of an earlier trial, testing the safety of a drug called RAY121 in people with six different immune system disorders, including antiphospholipid syndrome and immune thrombocytopenia. Participants have already completed four doses of RAY121 and shown improvement. The goal is to see if the drug remains safe and effective over a longer period.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance

RAY121 (a drug that blocks a part of the immune system called the classical complement pathway)

What this could lead to

If successful, this could show that RAY121 is safe and effective for long-term control of several autoimmune diseases, potentially offering a new treatment option.

What could go wrong

This is a very early (Phase 1) and small study (144 people). It only includes patients who already responded to RAY121, so results may not apply to everyone. Long-term safety is still unknown.

Disclaimer Read more

This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.

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Conditions

The condition(s) this trial relates to.

antiphospholipid syndrome Behcet disease bullous pemphigoid dermatomyositis immune-mediated necrotizing myopathy Purpura, Thrombocytopenic, Idiopathic thrombocytopenia due to immune destruction

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

ANTIPHOSPHOLIPID SYNDROME (APS) BEHÇET'S SYNDROME (BS) BULLOUS PEMPHIGOID (BP) DERMATOMYOSITIS (DM) IMMUNE THROMBOCYTOPENIA (ITP) IMMUNE-MEDIATED NECROTIZING MYOPATHY (IMNM)

Contacts and locations

Locations

  • "SHATHD" EAD Sofia

    Sofia, Sofia City Province, 1756, Bulgaria

  • AKH - Medizinische Universitaet Wien, Abteilung fuer Klinische Pharmakologie

    Vienna, 1090, Austria

  • AP-HP Hôpital Universitaire Pitié Salpêtrière

    Paris, Île-de-France Region, 75013, France

  • Box Hill Hospital

    Melbourne, Victoria, 3128, Australia

  • Campbelltown Public Hospital

    Sydney, New South Wales, 2560, Australia

  • Centro Clinico Academico Braga

    Braga, Braga District, 471-243, Portugal

  • Centro Hospitalar de Vila Nova de Gaia/Espinho, E.P.E.

    Vila Nova de Gaia, Porto District, 4434-502, Portugal

  • Centrul Medical Monza SRL

    Bucharest, Bucharest Municipality, 400015, Romania

  • Clinica Universidad de Navarra

    Pamplona, Community of Madrid & Navarre, 28027, Spain

  • Clinical Hospital Center "Sestre Milosrdnice"

    Zagreb, City of Zagreb, 10000, Croatia

  • DiIEX Recherche Sherbrooke, Inc

    Sherbrooke, Quebec, J1L 0H8, Canada

  • Diagnostic Consultation Center CONVEX EOOD

    Sofia, Sofia City Province, 1202, Bulgaria

  • Dr. Abdurrahman Yurtaslan Oncology Teaching and Research Hospital

    Ankara, Ankara, 06200, Turkey (Türkiye)

  • Hamamatsu University Hospital

    Hamamatsu, Shizuoka, 431-3192, Japan

  • Hokkaido University Hospital

    Sapporo, Hokkaido, 060-0808, Japan

  • Hopital Lapeyronie,Service d'Immuno Rhumatologie

    Montpellier, Occitanie, 34295, France

  • Hospital Universitari Vall d'Hebron, Internal Medicine Dept.

    Barcelona, Province of Barcelona and Catalonia, 08035, Spain

  • Hospital Universitari i Politecnic La Fe

    Valencia, Valencia, 46026, Spain

  • Hospital Universitario 12 de October

    Madrid, Madrid, 28041, Spain

  • Hospital Universitario Ramon y Cajal, Servicio de Reumatologia

    Madrid, Madrid, 28034, Spain

  • Hospital Universitario Reina Sofia

    Córdoba, Province Of Córdoba, 14004, Spain

  • Hospital Universitario Virgen del Rocio

    Seville, Province Of Seville, 41013, Spain

  • IRCCS Istituto Scientifico Romagnolo Per Lo Studio Dei Tumori "Dino Amadori" - IRST

    Meldola, Forlì-Cesena Province, 47014, Italy

  • Institute Reumatologii I'm. Eleonory Reicher

    Warsaw, Masovian Voivodeship, 02-637, Poland

  • Institute of Science Tokyo Hospital

    Bunkyo-ku, Tokyo, 113-8519, Japan

  • Istanbul University Istanbul Medical Faculty

    Istanbul, Istanbul, 34093, Turkey (Türkiye)

  • Istituto Clinico Humanitas

    Milan, Milan Province, 20089, Italy

  • Kindai University Hospital

    Sakai, Osaka, 589-8511, Japan

  • National Center of Neurology and Psychiatry

    Kodaira, Tokyo, 187-8551, Japan

  • National Hospital Organization Kyushu Medical Center

    Fukuoka, 810-8563, Japan

  • National Hospital Organization Osaka Minami Medical Center

    Kawachi-Nagano, Osaka, 586-8521, Japan

  • National Hospital Organization Tokyo Medical Center

    Meguro-ku, Tokyo, 152-8902, Japan

  • National Taiwan University Hospital

    Taipei, 100229, Taiwan

  • Okayama University Hospital

    Okayama, 700-8558, Japan

  • Oncology Institute Prof. Dr. Ion Chiricuta I.O.C.N.

    Cluj-Napoca, Cluj, 11658, Romania

  • Osaka University Hospital

    Suita, Osaka, 565-0871, Japan

  • Ospedale San Giovanni Bosco

    Torino, Turin Province, 10154, Italy

  • Royal Prince Alfred Hospital

    Camperdown, New South Wales, 2050, Australia

  • Sanatorium Profesora Arenbergera

    Prague, Prague, 11000, Czechia

  • Semmelweis Egyetem

    Budapest, 1083, Hungary

  • Sorlandet sykehus Kristiansand

    Kristiansand, Agder County, 4604, Norway

  • Specialty Hospital Medico

    Rijeka, Primorje-Gorski Kotar County, 51000, Croatia

  • Stavanger Universitetssjukehus

    Stavanger, Rogaland County, 4011, Norway

  • Szegedi Tudomanyegyetem Szent-Gyorgyi Albert Klinikai Kozpont

    Szeged, Csongrád-Csanád County, 6720, Hungary

  • Taichung Veterans General Hospital

    Taipei, 407219, Taiwan

  • The Alfred Hospital

    Melbourne, Victoria, 3004, Australia

  • Toho University Omori Medical Center

    Ōta-ku, Tokyo, 134-8540, Japan

  • Tohoku University Hospital

    Sendai, Miyagi, 980-8574, Japan

  • UMC Utrecht

    Utrecht, Utrecht Province, 3584 CX, Netherlands

  • UMHAT "Prof. Dr. St. Kirkovich", AD

    Stara Zagora, Stara Zagora Province, 6003, Bulgaria

  • Universitaetsklinikum Carl Gustav Carus TU Dresden, Klinik und Poliklinik f. Dermatologie

    Sachsen, Bundesländer, 1307, Germany

  • Universitaetsklinikum Erlangen

    Erlangen, Bavaria, 91054, Germany

  • Universitaetsklinikum Schleswig Holstein - Campus Luebeck, Klinik f Dermatologie, Allergologie u Venerologie

    Lübeck, Schleswig-Holstein, 23538, Germany

  • Universitaetsklinikum Tuebingen

    Tübingen, Baden-Wurttemberg, 72076, Germany

  • Universitaetsmedizin Goettingen

    Göttingen, Göttingen District, 3075, Germany

  • University Medical Centre Groningen UMCG

    Groningen, Groningen Province, 9713 GZ, Netherlands

  • University hospital centre Zagreb

    Zagreb, City of Zagreb, 10000, Croatia

  • Westmead Hospital

    Sydney, New South Wales, 2145, Australia