Dendritic cells (DCs) orchestrate immune responses after allogeneic hematopoietic cell transplantation (HCT). We studied the association of donor myeloid DCs (mDCs) and plasmacytoid DCs (pDCs) recovery in the landmark analysis of umbilical cord blood (UCB) and matched related donor (RD) HCT. Eighty patients (42 UCB and 38 RD recipients) with a day 100 blood sample were included in the analysis. Median age was 51 years (range, 20 to 71). Most patients had acute leukemia (50%) or lymphoma (23%) and received reduced-intensity conditioning (75%). After transplantation, UCB recipients had higher DC counts than RD recipients reaching normal levels at day 100 after transplantation (UCB median 4.7 cells/µL versus RD median 1.7 cells/µL). UCB recipients with high day 100 pDCs levels (≥ median) had 2-fold lower risk of relapse compared with those with pDClow (14% versus 28%, P =.29) and a trend to improved 1-year survival in multivariate analysis with hazard ratio of.22 (95% confidence interval,.04 to 1.05; P =.057). Cytomegalovirus (CMV) reactivation had adverse impact on DC reconstitution at day 100 in both UCB and RD groups and almost exclusively affected the mDC subset (CMV reactivation: mDC 3.2 cells/µL versus no CMV reactivation: 7.8 cells/µL; P =.004). Collectively, these data suggest that high levels of circulating pDCs at day 100 after UCB transplantation confer a survival advantage at 1 year.
Bibliographical noteFunding Information:
Research reported in this publication was supported by National Institutes of Health grant P30 CA77598 utilizing the Biostatistics and Bioinformatics Core, Oncology Medical Informatics Services and the Translational Therapy Laboratory, all Shared Resources of the Masonic Cancer Center, University of Minnesota and by the National Center for Advancing Translational Sciences of the National Institutes of Health Award Number UL1TR000114 . This work was supported in part by a grant from the National Cancer Institute CA65493 (J.S.M., M.R.V., C.G.B.) and National Center for Advancing Translational Sciences KL2 TR000113 and the National Institutes of Health Award Number UL1TR000114 (V.B.). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
- Dendritic cells
- Related donor transplantation
- Umbilical cord blood transplantation