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Correspondence

Donor-Derived T-Cell Leukemia after Bone Marrow Transplantation

N Engl J Med 2006; 354:1758-1759April 20, 2006

Article

To the Editor:

Asymptomatic carriers of human T-cell lymphotropic virus type I (HTLV-I) are considered acceptable as donors in allogeneic stem-cell transplantation for patients with adult T-cell leukemia–lymphoma (ATL).1 However, the infusion of HTLV-I–infected cells from HTLV-I–seropositive donors could lead to the development of donor-derived ATL under immunosuppressive conditions after stem-cell transplantation. Here we describe a patient in whom ATL derived from donor cells developed four months after transplantation of stem cells from a sibling with HTLV-I.

A 44-year-old Japanese man with lymphoma-type ATL underwent transplantation of bone marrow from his HLA-identical brother in February 2004. The conditioning regimen included intravenous cyclophosphamide (120 mg per kilogram of body weight) and total-body irradiation (12 Gy). Cyclosporine and a short course of methotrexate were given as prophylaxis against graft-versus-host disease (GVHD). On day 26, low-dose prednisone was instituted because of GVHD-associated fever. With stable hematopoietic engraftment, complete donor chimerism was confirmed in a T-cell fraction on day 20 (Figure 1Figure 1Analysis of T Cells at Engraftment (Day 20) and at the Onset of ATL (Day 133).). On day 133, the patient's white-cell count increased to 49.1×109 per liter with 89 percent ATL cells, although the original tumor had completely disappeared. Southern blot analysis revealed monoclonal integration of HTLV-I provirus in the ATL cells. Although we discontinued immunosuppressive therapy and administered chemotherapeutic agents, the patient died of the tumor in August 2004 (day 177).

A test for the status of donor–recipient chimerism in a T-cell–enriched fraction at the onset of ATL after transplantation showed a donor pattern (Figure 1). In September 2004, hematologic and blood chemical values of the donor were almost normal, although the white-cell count included 1 percent atypical lymphocytes. Southern blot analysis showed no monoclonal integration of the HTLV-I provirus in the peripheral-blood mononuclear cells of the donor. These findings suggest that the donor was still an asymptomatic carrier without substantial clonal proliferation of HTLV-I–infected cells.

Suppression of the host immune system increases the occurrence of virus-associated lymphoid cancers.2 ATL develops in approximately 5 percent of HTLV-I carriers after an incubation period of several decades.3 However, ATL has been reported to develop at a younger age in renal-transplant recipients with HTLV-I infection during immunosuppressive therapy4 and sooner after the transmission of HTLV-I infection through blood transfusion in patients under immunosuppressive conditions.5 Thus, the immunosuppressive status in recipients of stem-cell transplants also potentially contributes to the development of ATL in donor-derived T cells that are infected with HTLV-I.

Hiroya Tamaki, M.D., Ph.D.
Osaka Minami Medical Center, Osaka 586-8521, Japan

Masao Matsuoka, M.D., Ph.D.
Kyoto University Institute for Virus Research, Kyoto 606-8507, Japan

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    M Jabbour, H Tuncer, J Castillo, J Butera, T Roy, J Pojani, M Al-Malki, A S Al-Homsi. (2011) Hematopoietic SCT for adult T-cell leukemia/lymphoma: a review. Bone Marrow Transplantation 46:8, 1039-1044
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    Daniel H. Wiseman. (2011) Donor Cell Leukemia: A Review. Biology of Blood and Marrow Transplantation 17:6, 771-789
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    Kenji Ishitsuka, Kazuo Tamura. (2008) Treatment of adult T-cell leukemia/lymphoma: past, present, and future. European Journal of Haematology 80:3, 185-196
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    Jun-ichirou Yasunaga*, Masao Matsuoka. (2007) Leukaemogenic mechanism of human T-cell leukaemia virus type I. Reviews in Medical Virology 17:5, 301-311
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    H Tamaki, Y Taniguchi, A Kikuchi, T Yamagami, T Soma, M Matsuoka. (2007) Development of adult T-cell leukemia in donor-derived human T-cell leukemia virus type I-infected T cells after allogeneic bone marrow transplantation. Leukemia 21:7, 1594-1596
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