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Aim. Using strict criteria, to assess incidence, pretransplant risk factors, and outcomes of severe "poor graft function" (sPGF), following allogeneic hematopoietic stem cell transplantation (allo-HSCT) in adults. Materials &amp; Methods. The study included 710 adult patients (median age was 31 years, range 18-70 years; 55 % male and 45 % female patients) with different hematological diseases and documented transplant engraftment after allo-HSCT from matched sibling (20 %), unrelated (67 %) and haploidentical (13 %) donors in the period from 2008 to 2016. Myeloablative and reduced-intensity conditioning regimens were administered in 30 % and 70 % of patients, respectively. The analysis was based on the following sPGF criteria: 2 or more lines of cytopenia (platelets  9 /L, absolute neutrophil count  9 /L, and hemoglobin   90 %, and absence of relapse signs, rejection, and severe acute graft-versus-host reaction. The following factors were analyzed: age, sex, diagnosis, presence/absence of remission in acute leukemias, ferritin level, type of donor, HLA-match, blood group and sex match, graft source, number of transplanted CD34+ cells, and conditioning regimen. Multivariate analysis included parameters of univariate analysis with p  st  year after allo-HSCT (median 50 days). Bi- and trilineage cytopenia was found in 59 % and 41 % of cases, respectively. In multivariate analysis sPGF risk was associated with myelodysplastic syndrome, myeloproliferative disorders (hazard ratio [HR] 3.403; 95% CI 1.972-5.606; p &lt; 0.0001), and haploidentical donors (HR 3.830; 95% CI 1.545-8.828; p = 0.001). The absence of remission at the time of allo-HSCT in acute leukemias and blood group incompatibility were of borderline significance. In almost half of the cases, sPGF had a poor outcome, including death from cytopenia-related complications, further relapses, and graft rejection. Prognosis of bilineage sPGF was more favorable than that of trilineage sPGF. Conclusion. The present large cohort study yielded the incidence and analyzed the structure of sPGF in adult patients with oncohematological diseases. In addition, the key pretransplant sPGF risk factors were identified. The results of the trial can serve to optimize the choice of therapy after allo-HSCT.

Severe "Poor Graft Function" after Allogeneic Hematopoietic Stem Cell Transplantation in Adult Patients: Incidence, Risk Factors, and Outcomes