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Objectives: Haploidentical haematopoietic cell transplantation (Haplo‐HCT) using peripheral blood stem cell (PBSC) grafts and post‐transplant cyclophosphamide (PTCy) is being increasingly used; however, data on immunological reconstitution (IR) are still scarce. Methods: This retrospective study evaluated T‐cell immunological reconstitution in 106 adult patients who underwent allogeneic haematopoietic cell transplantation for haematologic malignancies between 2013 and 2016. Results: At D30, while conventional T cells reached similar median counts in Haplo‐HCT recipients (n = 19) and controls (n = 87), γδ and Vδ2+ T‐cell median counts were significantly lower in Haplo‐HCT recipients and it persists at least until D360 for Vδ2+ T cells. PTCy induces a significant reduction in early γδ and Vδ2+ T‐cell proliferation at D 7. At one year, the rate of increase in Epstein–Barr virus (EBV) viral load was significantly higher in Haplo‐HCT recipients as compared to controls (61% versus 34%, P = 0.02). In multivariate analysis, a higher γδ T‐cell count (> 4.63 μL−1) at D30 was the only independent parameter significantly associated with a reduced risk of increase in EBV viral load (RR 0.34; 95% CI, 0.15–0.76, P = 0.009). Conclusion: Immunological reconstitution of γδ T cells is significantly delayed after Haplo‐HCT using PTCy and low‐dose ATG and is associated with an increased risk of increase in EBV viral load. [ABSTRACT FROM AUTHOR]

Objectives: This retrospective study analyzed the impact of early cyclosporine A (CsA) initiation (day −3) on the risk of acute graft‐vs‐host disease (aGvHD) after haploidentical hematopoietic cell transplantation (Haplo‐HCT) using post‐transplant cyclophosphamide. Methods: Sixty‐one consecutives patients who underwent Haplo‐HCT were analyzed. Results: At day +180, the cumulative incidences of grade II‐IV and grade III‐IV aGvHD were 39% and 18%, respectively. Patients having a lowest CsA concentration (<301 ng/mL; the cutoff value used to segregate the patients between low and high CsA concentrations) in the first week after Haplo‐HCT had a significantly higher risk of grade II‐IV aGvHD (P = 0.02), severe grade III‐IV aGvHD (P = 0.03), cGvHD (P = 0.02), and extensive cGvHD (P = 0.04). In multivariate analysis, a higher CsA concentration (≥301 ng/mL) during the first week following Haplo‐HCT was the only parameter significantly associated with a reduced risk of grade II‐IV and grade III‐IV aGvHD (RR = 0.21; P = 0.049 and RR < 0.001; P < 0.0001, respectively). We find no correlation between CsA concentration and relapse, non‐relapse mortality, progression‐free survival, GvHD‐free and progression‐free survival, or overall survival. Conclusions: CsA could be initiated early before Haplo‐HCT with achievement of high CsA concentration to reduce the risk of aGvHD without any detrimental effect on relapse. [ABSTRACT FROM AUTHOR]