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Immunodeficiencies better treated by transplantation.

J R Hobbs, K Hugh-Jones

    The Tokai Journal of Experimental and Clinical Medicine
    |June 1, 1985
    PubMed
    Summary

    Bone marrow transplants can correct severe combined immunodeficiency (SCID) by restoring T-cell and B-cell function. Matched sibling donors offer the best outcomes, especially for elective procedures in healthy infants.

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    Area of Science:

    • Immunology
    • Hematology
    • Transplantation

    Background:

    • Successful immunodeficiency correction requires balanced cooperation between T-cells, B-cells, and antigen-presenting cells for host defense against viral infections.
    • Optimal B-cell function often necessitates well-matched genetic haplotypes between host and donor, or donor cell-mediated displacement of host B-cells.

    Purpose of the Study:

    • To evaluate the efficacy of bone marrow transplantation (BMT) in correcting various forms of severe combined immunodeficiency (SCID) and other immune defects.
    • To compare outcomes based on donor matching, transplant conditioning, and recipient health status.

    Main Methods:

    • Bone marrow transplantation with varying conditioning regimens (Busulphan, irradiation, Cyclophosphamide) and donor types (matched sibling, haplotype-matched, unrelated).
    • Assessment of T-cell and B-cell function post-transplant and patient survival rates.
    • Distinguishing between BMT without induction and BMT with displacement induction for different immune defects.

    Main Results:

    • BMT without induction successfully corrected four types of lymphopenic SCID.
    • Displacement induction was essential for 16 lymphocyte function errors and 9 phagocyte defects, with Cyclophosphamide effective for matched sibling donors.
    • Elective BMT from matched sibling donors into fit recipients yielded 98.7% survival, with only one fatal acute graft-versus-host disease (GvHD).
    • Emergency transplants in unfit recipients had 60% survival, while haplotype-matched donors achieved 50% survival.

    Conclusions:

    • Bone marrow transplantation, particularly from matched sibling donors with appropriate conditioning, is a highly effective treatment for SCID and other primary immunodeficiencies.
    • Recipient fitness and donor matching significantly impact transplant outcomes, with elective procedures in healthy patients offering superior survival rates.
    • Further research is warranted to improve outcomes for transplants using haplotype-matched or unrelated donors.

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