Abstract:
:Seventy-one patients with hematologic malignancies received bone marrow from a histocompatible sibling (n = 48) or a partially matched relative (n = 23) that had been depleted of CD5+ T cells with either an anti-CD5 mooclonal antibody (MoAb) plus complement (anti-Leu1 + C) or an anti-CD5 MoAb conjugated to ricin A chain (ST1 immunotoxin [ST1-IT]). These patients received intensive chemoradiotherapy consisting of cytosine arabinoside, cyclophosphamide, and fractionated total body irradiation. Both anti-Leu1 + C and ST1-IT ex vivo treatments effectively depleted bone marrow of T cells (97% and 95%, respectively). Overall, primary and late graft failure each occurred in 4% of evaluable patients. The diagnosis of myelodysplasia was a significant risk factor for graft failure (P less than .001), and if myelodysplastic patients were excluded, there were no graft failures in major histocompatibility complex (MHC)-matched patients and 2 of 23 (8.7%) in MHC-mismatched patients. The actuarial risk of grade 2 to 4 acute graft-versus-host disease (GVHD) was 23% in MHC-matched patients and 50% in MHC-mismatched patients. In MHC-matched patients, acute GVHD tended to be mild and treatable with corticosteroids. Chronic GVHD was observed in 6 of 36 (17%) MHC-matched patients and none of 11 MHC-mismatched patients. There were no deaths attributable to GVHD in the MHC-matched group. Epstein-Barr virus-associated lymphoproliferative disorders were observed in 3 of 23 MHC-mismatched patients. The actuarial event-free survival was 38% in the MHC-matched patients versus 21% in the MHC-mismatched patients. However, if outcome is analyzed by risk of relapse, low-risk patients had a 62% actuarial survival compared with 11% in high-risk patients. These data indicate that the use of anti-CD5 MoAbs can effectively control GVHD in histocompatible patients, and that additional strategies are required in MHC-mismatched and high-risk patients.
journal_name
Bloodjournal_title
Bloodauthors
Antin JH,Bierer BE,Smith BR,Ferrara J,Guinan EC,Sieff C,Golan DE,Macklis RM,Tarbell NJ,Lynch Esubject
Has Abstract,Author List Incompletepub_date
1991-10-15 00:00:00pages
2139-49issue
8eissn
0006-4971issn
1528-0020journal_volume
78pub_type
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