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Pure red cell aplasia (PRCA) and autoimmune hemolytic anemia (AIHA) post-hematopoietic stem cell transplantation (HSCT) are an unmet medical need with no established standard of care, significantly affecting the patient quality of life and posing a challenge for clinicians. The anti-CD38 IgG-kappa Daratumumab appears to be a safe and efficace treatment compared to prior drugs. Our study is a prospective monocentric investigation assessing the use of daratumumab in these complications following allo-HSCT.

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Article Synopsis
  • Allogeneic stem cell transplantation (allo-SCT) offers curative potential for multiple myeloma patients but is effective in only a minority, with some patients experiencing long-term survival after relapse thanks to a combination of antimyeloma drugs and donor T cells.
  • A study evaluating 242 multiple myeloma patients who underwent allo-SCT revealed a median overall survival of 39.4 months and highlighted factors like older age and previous therapies that predict shorter survival outcomes.
  • Among 118 relapsed patients, various treatments were employed, with a significant portion receiving multiple lines of salvage therapy, including chemotherapy and immunomodulating agents, demonstrating a diverse treatment approach post-relapse.
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Daratumumab in the Management of Red Cell Aplasia Following Allogeneic Hematopoietic Stem Cell Transplantation.

Eur J Haematol

November 2024

Hans Messner Allogeneic Blood and Marrow Transplant Program, Division of Medical Oncology and Hematology, Princess Margaret Hospital, Toronto, Canada.

Pure red cell aplasia (PRCA) is a rare but significant complication following major ABO-incompatible allogeneic hematopoietic stem cell transplantation (HSCT). The persistence of recipient B lymphocytes producing anti-donor isohemagglutinins leads to reticulocytopenia and anemia, often resulting in transfusion dependence. Current treatment options for post-HSCT PRCA are limited and frequently yield suboptimal responses, complicating patient management.

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Isatuximab is an IgG1-derived monoclonal antibody against CD38 approved for the treatment of adult patients with multiple myeloma. Here we describe the successful treatment of a therapy-refractory pure red cell aplasia case following ABO-mismatched allogeneic stem cell transplantation with isatuximab. Our patient was a 75-year-old female with acute myeloid leukemia who received an HLA-B antigen mismatched, unrelated peripheral blood stem cell transplant with a major ABO incompatibility (blood group A+ in the donor and blood group O+ in the recipient).

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