Infectious outcomes after alternative donor stem cell transplantation: a retrospective cohort comparison

J. Somani, I. Redei, .I Cherry, A. Tanner, S. Lonial, V Bartlett, K. Manion, E. Wailer, A. Langston

Author address: 

Emory University BM and Stem Cell Transplant Center, Atlanta, GA, USA


Allogeneic stem cell transplantation from donors other than HLA-matched siblings results in a high risk of posttransplant infections because of the risk of graft-versushost disease (GVHD) with an unmanipulated graft, or delayed immune reconstitution following T cell-depletion (TCD). We compared infectious outcomes in the first yr post-transplant (tx) in 28 consecutive recipients of stringently TCD blood hematopoeitic progenitor cell (HPC) grafts from haploidentical family donors (HD), and 28 consecutive recipients of unmanipulated grafts from matched or 1 Ag mismatched unrelated donors (URD). Included are pts (excluding CML-CPl) transplanted at our center between 6198 and 12/01 after myeloablative conditioning. HD pts received pre-tx ATG, and no scheduled post-tx immunosuppression. URD pts received tacrolimus and methotrexate for GVHD prophylaxis. Median CD3-t cell dose/kg was 3.6 logs lower in the HD vs URD grafts (pd loo), and CMV disease were similar in the two groups. EBV-associated PTLD was unique to HD pts (n=3), and drug-resistant HSV disease was also more common after HD tx. Infection related deaths (censored at 1 yr) in HD pts included bacterial sepsis (3),Aspergillosis (3) parainfluenza pneumonia (2) PCP (1) other pneumonia (l), amebic encephalitis (1) toxoplasmosis (1) EBVPTLD (l), and acalculous cholecystitis (1). Infectious deaths in URD pts resulted from IF1 (3) bacterial sepsis (2), CMV pneumonia (1) aspiration pneumonia (1) and acalculous cholecystitis (1). Infections are the most common cause of death in these pts. The trend toward higher risk of infectious death following TCD HD vs unmanipulated URD transplants was not statistically significant, although the spectrum of infections was different. Strategies aimed at enhancing immune reconstitution without stimulating GVHD are needed to reduce the risks of infection and relapse after stringently TCD alternative donor transplantation.

abstract No: 


Full conference title: 

12th International Symposium on Infections in the Immunocompromised Host
    • ISIIH 12th