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Prepublished online as a Blood First Edition Paper on September 12, 2002; DOI 10.1182/blood-2002-05-1615.

Submitted June 4, 2002
Accepted August 22, 2002
Outcome of transplantation of highly purified peripheral blood CD34+ cells with T cell add-back compared to unmanipulated bone marrow or peripheral blood stem cells from HLA-identical sibling donors in patients with first chronic phase chronic myeloid leukemia
Ahmet H Elmaagacli*, Rudolf Peceny, Nina Steckel, Rudolf Trenschel, Hellmut Ottinger, Hans Grosse-Wilde, Ulrich W Schaefer, and Dietrich W Beelen
Bone Marrow Transplantation, University Hospital Essen, Essen, Germany
Institute of Immunology, University Hosptial Essen, Essen, Germany
* Corresponding author; email: ahmet.elmaagacli{at}uni-essen.de.
Outcomes of highly purified CD34+ peripheral blood stem cell transplantation (PBSCT) for chronic phase CML (n=32) were compared to those of PBSCT (n=19) and of bone marrow transplantation (BMT) (n=22) in the HLA-compatible sibling donor setting. Median follow-up was 18 months after CD34+-PBSCT and unmanipulated PBSCT and 20 months after BMT. CD34+-PBSCT was associated with delayed T cell immune reconstitution at 3 months and 12 months post transplant compared with PBSCT (P<0.001) or BMT (NS). The estimated probability of grade II - IV acute graft-versus-host disease (GVHD) was 60% ± 13% for the PBSCT group, 37% ± 13% for the BMT group and only 14% ± 8% for the CD34+-PBSCT group (CD34-PBSCT versus BMT P<0.01 and CD34-PBSCT versus PBSCT P<0.001). The probabilities for molecular relapse were 88% for CD34+-PBSCT, 55% after BMT and 37% after PBSCT (CD34+PBSCT versus PBSCT P<0.03). Cytogenetic relapse probability were 58% after CD34+-PBSCT, 42% after BMT, and 28% after PBSCT (NS). 26 of 32 patients after CD34+-PBSCT received a T cell add-back. Hematologic relapse occurred in 4 of 22 patients after BMT, in 3 of 19 patients after PBSCT and only in 1 of 32 patients after CD34+-PBSCT. The occurrence of an hematologic relapse in patients receiving CD34+-PBSCT was prevented by donor leukocyte infusions, which were applied at a median of 4 times (range 1-7) with a median T cell dose of 3.3x106 x kg/body weight [at a median] beginning at day 120 (75-660 days). The estimated probability of 3-year-survival after transplant was 90% in the CD34+-PBSCT, 68% in the PBSCT group, and 63% in the BMT group, respectively (CD34-PBSCT versus BMT P<0.01 and CD34-PBSCT versus PBSCT P<0.03). Transplantation of CD34+-PBSCs with T cell add-back for patients with CML in 1st chronic phase seems to be safe and is an encouraging alternative transplant procedure to BMT or PBSCT.

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