{
  "abstract": "Introduction: Fitusiran is an antithrombin (AT)-lowering therapeutic that increases thrombin generation to restore hemostasis in people with hemophilia (PwH) A/B, with and without inhibitors. Breakthrough bleed management guidelines (BMG) with reduced dose and frequency of clotting factor concentrates (CFC)/bypassing agents (BPA) were recommended for perioperative management. Objectives: To present hemostatic outcomes and provide case reviews of orthopedic surgeries performed in PwHA/B aged ≥12 years receiving fitusiran prophylaxis, regardless of inhibitor status. Methods: All major orthopedic surgeries in the fitusiran clinical program until 14 June 2023 were evaluated, including participants on AT-based dose regimen (AT-DR) and fixed 80 mg once-monthly dose (ODR). Procedures conducted during fitusiran prophylaxis with AT levels <60% were included. Major orthopedic surgeries were defined as operations on a joint or bone and associated soft tissue. Procedure management was at investigator/surgeon’s discretion. Perioperative hemostatic control was assessed using the ISTH 4-point response scale (excellent/good/moderate/poor) on the day of surgery. Results: Nineteen major orthopedic surgeries (AT-DR, n = 7; ODR, n = 12) were performed in 16 participants. Hemostatic control was excellent/good in 13/15 (87%) and moderate in 2/15 (13%; knee arthroplasty and total knee replacement, both treated with BPAs) surgeries with an assessment on the surgery day. Reduced doses of CFC/BPAs were used in 15/19 (79%) surgeries, per BMG. A tibial metal plate/screw fixation was managed successfully with fitusiran prophylaxis without any CFC/BPA. On the surgery day, AT level was 9.1% and hemostatic control was good; no complications were reported in the perioperative period. AT concentrate (ATIII) was used per investigator discretion in two participants, with excellent hemostatic control on the day of the surgery in one (internal fixation for femoral/patella fractures) and moderate in the other (right knee arthroplasty). Antifibrinolytics were not used during major orthopedic surgeries. One postoperative lower limb deep vein thrombosis occurred during a knee arthroplasty in the setting of pre-existing thrombotic risk factors, including morbid obesity restricting mobility and excessive FVIII dosing exceeding BMG and ISTH recommendations; fitusiran was permanently discontinued 14 days after surgery due to this event. No postoperative safety findings or complications were reported when BMG were followed. Conclusion: Major orthopedic surgeries can be safely and effectively performed in PwHA/B, with and without inhibitors, receiving fitusiran prophylaxis using reduced CFC/BPA doses as per BMG, highlighting the benefit and efficacy of reduced CFC/BPA consumption with fitusiran prophylaxis. Perioperative ATIII administration is not necessary. Postoperative thrombosis in a participant with pre-exisitng increased thrombotic risk after dosing above the BMG highlighted the importance of BMG adherence. Funding: Sanofi.",
  "abstract_shown": true,
  "affiliations": [
    "Massachusetts General Hospital, Boston, United States",
    "Groupe Hospitalier Necker Enfants Malades, France",
    "Ege University Faculty of Medicine, Türkiye",
    "Central Hospital of Northern Pest – Military Hospital, Budapest, Hungary",
    "Fiona Stanley Hospital, Australia",
    "Nanfang Hospital, China",
    "Eulji University Hospital, Daejeon, South Korea",
    "Azienda Ospedale Università di Padova, Italy",
    "Center for Inherited Blood, Disorders, Orange, United States",
    "Sanofi, United States",
    "Sanofi, France",
    "St. John's Medical College Hospital, Bengaluru, India"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 14,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Larissa BORNIKOVA"
    },
    {
      "affs": [
        1
      ],
      "name": "Laurent FRENZEL"
    },
    {
      "affs": [
        2
      ],
      "name": "Kaan KAVAKLI"
    },
    {
      "affs": [
        3
      ],
      "name": "László NEMES"
    },
    {
      "affs": [
        4
      ],
      "name": "Stephanie P'NG"
    },
    {
      "affs": [
        5
      ],
      "name": "Jing SUN"
    },
    {
      "affs": [
        6
      ],
      "name": "Chur-woo YOU"
    },
    {
      "affs": [
        7
      ],
      "name": "Ezio ZANON"
    },
    {
      "affs": [
        8
      ],
      "name": "Vanessa SALINAS"
    },
    {
      "affs": [
        9
      ],
      "name": "Laurel MENAPACE"
    },
    {
      "affs": [
        9
      ],
      "name": "Abhimanyu YARRAMANENI"
    },
    {
      "affs": [
        9
      ],
      "name": "Yuqian SHEN"
    },
    {
      "affs": [
        10
      ],
      "name": "Salim KICHOU"
    },
    {
      "affs": [
        11
      ],
      "name": "Alok SRIVASTAVA"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6c2tre6etypgc.bib",
  "cited_by": 0,
  "doi": "10.1016/j.htct.2026.108025",
  "fulltext_url": "http://www.sciencedirect.com/science/article/pii/S2531137926017724",
  "id": "6c2tre6etypgc",
  "issns": [
    "2531-1379",
    "2531-1387"
  ],
  "landing_url": "https://doi.org/10.1016/j.htct.2026.108025",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "lcc",
      "RC633-647.5"
    ],
    [
      "openalex",
      "2720|Hemophilia Treatment and Research"
    ]
  ],
  "openalex": "W7223141934",
  "pdf_url": "https://www.sciencedirect.com/science/article/pii/S2531137926017724/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": "Elsevier",
  "ris": "https://research.draconitic.com/paper/6c2tre6etypgc.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T13:43:19Z",
      "native_id": "50ac590da0f743c18282f3b7c7c11207",
      "source": "doaj",
      "url": "https://doi.org/10.1016/j.htct.2026.108025"
    }
  ],
  "subjects": [
    {
      "field": "medicine",
      "origin": "lcc:RC633-647.5",
      "subfield": "endocrinology-metabolism"
    }
  ],
  "title": "MAJOR ORTHOPEDIC SURGERIES CONDUCTED UNDER FITUSIRAN PROPHYLAXIS IN PEOPLE WITH HEMOPHILIA A AND B, WITH AND WITHOUT INHIBITORS",
  "title_text": "MAJOR ORTHOPEDIC SURGERIES CONDUCTED UNDER FITUSIRAN PROPHYLAXIS IN PEOPLE WITH HEMOPHILIA A AND B, WITH AND WITHOUT INHIBITORS",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T13:43:19Z",
  "url": "https://research.draconitic.com/paper/6c2tre6etypgc",
  "venue": "Hematology, Transfusion and Cell Therapy",
  "versions": []
}