title: Selective depletion of bone marrow T lymphocytes with anti-CD5 monoclonal antibodies: effective prophylaxis for graft-versus-host disease in patients with hematologic malignancies.
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.
authors.affiliation: Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115.
authors.forename: J H
authors.initials: JH
authors.lastname: Antin
authors.forename: B E
authors.initials: BE
authors.lastname: Bierer
authors.forename: B R
authors.initials: BR
authors.lastname: Smith
authors.forename: J
authors.initials: J
authors.lastname: Ferrara
authors.forename: E C
authors.initials: EC
authors.lastname: Guinan
authors.forename: C
authors.initials: C
authors.lastname: Sieff
authors.forename: D E
authors.initials: DE
authors.lastname: Golan
authors.forename: R M
authors.initials: RM
authors.lastname: Macklis
authors.forename: N J
authors.initials: NJ
authors.lastname: Tarbell
authors.forename: E
authors.initials: E
authors.lastname: Lynch
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000911:Antibodies, Monoclonal; D015703:Antigens, CD / Q000276:immunology*; D001854:Bone Marrow Cells; D016465:Bone Marrow Purging / Q000379:methods*; D018956:CD5 Antigens; D005260:Female; D006085:Graft Survival; D006086:Graft vs Host Disease / Q000517:prevention & control; D006801:Humans; D007938:Leukemia / Q000150:complications / Q000628:therapy; D008212:Lymphocyte Depletion / Q000592:standards; D008232:Lymphoproliferative Disorders / Q000209:etiology; D008297:Male; D008875:Middle Aged; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D018956:CD5 Antigens