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Dendritic Cell Recovery Impacts Outcomes after Umbilical Cord Blood and Sibling Donor Transplantation for Hematologic Malignancies.
Biology of Blood and Marrow Transplantation 2017 November
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.
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