title: Cytomegalovirus reactivation after matched sibling donor reduced-intensity conditioning allogeneic hematopoietic stem cell transplant correlates with donor killer immunoglobulin-like receptor genotype.
abstract: OBJECTIVE
  Cytomegalovirus reactivation is common after reduced-intensity conditioning allogeneic hematopoietic stem cell transplant. Natural killer and T cells mediate immunity against viruses including cytomegalovirus. The alloreactivity of natural killer cells and some T-cell subsets is mediated through the interaction of their killer immunoglobulin-like receptors with target cell ligands. This study sought to assess whether donor inhibitory or activating killer immunoglobulin-like receptor genotypes may influence post-transplant cytomegalovirus reactivation in transplant recipients.
  
  
  METHODS
  We analyzed 64 patients who underwent T-cell replete, matched sibling donor reduced-intensity conditioning allogeneic hematopoietic stem cell transplantation at our institution. Transplant recipients were categorized according to their HLA inhibitory killer immunoglobulin-like receptor ligand groups. Donor killer immunoglobulin-like receptor genotypes were determined and then were assessed for correlations with cytomegalovirus reactivation in transplant recipients.
  
  
  RESULTS
  No differences in cytomegalovirus reactivation were observed when comparing those with or without missing inhibitory killer immunoglobulin-like receptor ligands. When considering the number of donor activating killer immunoglobulin-like receptor genes, those with 5 or 6 had less cytomegalovirus reactivation than those with 1 to 4 (19% vs 48%; P = .029). The difference could not be attributed to baseline patient or transplant characteristics. No specific activating killer immunoglobulin-like receptor genotype was found to be associated with cytomegalovirus reactivation.
  
  
  CONCLUSIONS
  These observations indicate that assessment of donor killer immunoglobulin-like receptor genotype may have important implications for predicting cytomegalovirus reactivation after T-cell replete, matched sibling donor reduced intensity conditioning allogeneic hematopoietic stem cell transplant.
authors: Department of Hematologic Oncology & Blood Disorders, Taussig Cancer Institute, Cleveland, OH, USA. sobeckr@ccf.org
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