Abstract
By retrospective analysis of 88 patients from the British Society of Blood and Marrow Transplantation registry, we investigated the effect of in vivo T-cell depletion in HLA-identical sibling reduced-intensity conditioning (RIC) allografts for adult AML by comparing patients who received alemtuzumab with those without alemtuzumab conditioning. Both groups were equivalent for age, sex, karyotype and disease status at transplant. With a median follow-up of 27 months (3–72 months) and 48 months (7–72 months), the 2- and 5-year overall survival, with or without alemtuzumab, is 60 and 60% (P=0.80) and 61 and 53%, respectively (P=0.85). The 2-year non-relapse mortality is 12% with alemtuzumab, and 17% without alemtuzumab (P=0.49). The 2-year relapse rate is 35% with alemtuzumab compared with 19% without alemtuzumab (P=0.28). Grades II–IV acute GVHD occurred in 22% (8/37) without alemtuzumab compared with 14% (7/51) given alemtuzumab (P=0.25). Extensive chronic GVHD occurred in 47% (14/30) not given alemtuzumab compared with 4% (2/45) who were given alemtuzumab (P=0.001). Among evaluable patients, the risk of infections was higher in those treated with alemtuzumab compared with those not treated with alemtuzumab (79 vs 57%, respectively, P=0.02). In conclusion, alemtuzumab has a beneficial effect by reducing chronic GVHD without affecting overall survival. Further studies are warranted before alemtuzumab can be recommended as standard in RIC allografts for AML.
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Acknowledgements
This study was performed on behalf of the Clinical Trials Committee of the BSBMT. We thank all of the data managers and transplantation physicians at the following participating centres for providing data and responding to additional requests: University Hospital of Wales, Cardiff; Leeds Teaching Hospitals NHS Trust; Sheffield Teaching Hospitals NHS Trust; Christie Hospital, Manchester; Addenbrookes Hospital, Cambridge; Nottingham City Hospital; The Royal Marsden Hospital, Sutton, Surrey; Royal Infirmary of Edinburgh; Birmingham Heartlands Hospital; St George's Hospital, London; John Radcliffe Hospital, Oxford; Manchester Royal Infirmary; St Bartholomew's Hospital, London; Queen Elizabeth Hospital, Birmingham; Southampton General Hospital; Hammersmith Hospital, London; Glasgow Royal Infirmary; Newcastle-upon-Tyne Hospitals; Bristol Childrens Hospital. AJP and TJL participate as members of the Oxford Biomedical Research Centre.
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Malladi, R., Peniket, A., Littlewood, T. et al. Alemtuzumab markedly reduces chronic GVHD without affecting overall survival in reduced-intensity conditioning sibling allo-SCT for adults with AML. Bone Marrow Transplant 43, 709–715 (2009). https://doi.org/10.1038/bmt.2008.375
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DOI: https://doi.org/10.1038/bmt.2008.375
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