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Allogeneic hematopoietic stem cell transplantation (allo-HSCT) has been considered as standard therapy for aggressive adult T cell leukemia/lymphoma (ATLL) patients to achieve a long-term survival [1, 2]. Anti-CCR4 monoclonal antibody mogamulizumab (Mog) is the first immunotherapeutic agent targeting ATLL. Since CCR4 is expressed on regulatory T cells (Treg), there is growing concern regarding increased risk of severe and refractory acute graft-versus-host disease (aGVHD) in ATLL patients treated with Mog before allo-HSCT (pretransplant Mog) [3–6].
We describe a case of an acute-type ATLL patient who underwent HLA-haploidentical peripheral blood stem cell transplantation (haplo-PBSCT) following pretransplant Mog. The interval between the last Mog administration and haplo-PBSCT was 49 days. A 65-year-old Japanese male presented with a 2-week history of fatigue, anorexia, and nausea. He was diagnosed as acute-type ATLL with hypercalcemia. His ATLL including abnormal bone lesions was chemorefractory. Therefore, he was further treated with two doses of Mog (1 mg/kg weekly for 2 weeks). The disease status significantly improved after Mog administration. Unmanipulated haplo-PBSCT was performed from his son (Table 1). The conditioning consisted of fludarabine (25 mg/m2/day, days −8 to −4), melphalan (80 mg/m2, day −3), rabbit anti-thymocyte globulin (thymoglobulin; 2.5 mg/kg, day −2), and TBI (4 Gy). Tacrolimus and mycophenolate mofetil were further used for GVHD prophylaxis. Stable and complete donor chimerism was obtained. On day 30, he only developed grade I aGVHD (stage 1 skin rash). One year later, the number of CD4 + CD25 + CD127-/low Treg cells and CD4 + T cells in his PB remained below the normal range (15/μL and 183/μL, respectively), showing delayed T cell reconstitution. He has been in complete remission (CR) without chronic GVHD for 2 years.
Low-dose thymoglobulin, in addition to its T cell depleting properties, stimulates the recovery of Treg cells [7, 8]. In this regard, Motohashi et al. reported an acute-type ATLL patient who achieved CR following Mog treatment and subsequently received unrelated bone marrow transplantation (uBMT) [9]. Two months after the last Mog administration, uBMT was performed from a serologically two antigen (HLA-C and -DR) mismatched donor by using conditioning with 1.25 mg/kg of thymoglobulin. As a result, they only observed grade I aGVHD.
In ATLL, allo-HSCT at disease regression induced by initial treatment has been shown to improve the clinical outcome [10]. Pretransplant Mog significantly improved the disease status before haplo-PBSCT. Moreover, a recent nationwide study of ATLL patients with pretransplant Mog in Japan showed that pretransplant Mog with intervals of <50 days to allo-HSCT was associated with increased risk of GVHD-related mortality [6]. In our case, the interval between pretransplant Mog and haplo-PBSCT was 49 days. The nationwide study also pointed out the possibility that in vivo effector T cell depletion with anti-thymocyte globulin contributes to the reduction of severe aGVHD in ATLL patients with pretransplant Mog [6]. To our knowledge, our case is the first report of successful prevention of aGVHD with low-dose thymoglobulin in haplo-PBSCT following pretransplant Mog. Low-dose thymoglobulin is an effective option for aGVHD prophylaxis in ATLL patients with pretransplant Mog.
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Hirosawa, M., Higashi, T., Iwashige, A. et al. HLA-haploidentical hematopoietic stem cell transplantation with low-dose thymoglobulin GVHD prophylaxis for an adult T cell leukemia/lymphoma patient treated with pretransplant mogamulizumab. Ann Hematol 96, 327–328 (2017). https://doi.org/10.1007/s00277-016-2856-y
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DOI: https://doi.org/10.1007/s00277-016-2856-y