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The recovery of circulating antigen-specific T-cell immunity to Epstein-Barr virus (EBV) was determined in ELIspot assays following allogeneic myeloablative or nonmyeloablative stem cell transplantation (MST/NST). In 8 of 12 MST patients receiving an alemtuzumab-treated graft, the frequency of the EBV-specific reactivities was similar to or greater than that seen in the healthy controls. A response was detectable in 3 of 6 and 6 of 9 patients by 3 and 6 months, respectively, and in all patients by one year following MST. In contrast, only 1 of 9 (95% confidence interval [CI], 0-2.8) patients made a detectable EBV-specific response by 6 months following NST conditioned with fludarabine, melphalan, and alemtuzumab. Responses were detected in 7 of 10 patients by 1 year after NST. Parallel surveillance demonstrated that other virus infections occurred more frequently and earlier after transplantation in NST patients. The use of alemtuzumab in vivo in the nonmyeloablative conditioning might have resulted in the delay in EBV-specific T-cell recovery and increased virus infections.

Original publication




Journal article



Publication Date





839 - 842


Alemtuzumab, Antibodies, Monoclonal, Antibodies, Monoclonal, Humanized, Antibodies, Neoplasm, Antigens, Viral, Antineoplastic Combined Chemotherapy Protocols, Epstein-Barr Virus Infections, Graft vs Host Disease, Hematologic Neoplasms, Hematopoietic Stem Cell Transplantation, Herpesvirus 4, Human, Humans, Lymphocyte Depletion, T-Lymphocytes, T-Lymphocytes, Cytotoxic, Transplantation Conditioning, Transplantation, Homologous