scholarly journals Adult Umbilical Cord Blood Transplantation Using Myeloablative Total Body Irradiation, Fludarabine, and Thiotepa Conditioning

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 3395-3395
Author(s):  
Sarah Anand ◽  
Samantha Thomas ◽  
Kelly Corbet ◽  
Cristina Gasparetto ◽  
Richard Lopez ◽  
...  
Keyword(s):  
Overall Survival ◽  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Cumulative Incidence ◽  
Cord Blood Transplantation ◽  
Chronic Gvhd ◽  
Treatment Related Mortality ◽  
Related Mortality ◽  
Neutrophil Engraftment

Abstract Introduction: Umbilical cord blood (UCB) extends the curative potential of stem cell transplantation to adult patients without a suitable donor. The most commonly used myeloablative preparative regimen results in an unacceptably high 6-month treatment related mortality rate of approximately 32% (Barker J et al. Br J Haematol. 2015). In an attempt to reduce treatment related mortality, we piloted a modified myeloablative regimen with total body irradiation (TBI), fludarabine, and thiotepa. We report clinical outcomes from a cohort of patients who received single or double UCBT after conditioning with this regimen. Methods: Thirty-one consecutive adult patients ≥ 18 years old with hematologic malignancies who underwent single or double umbilical cord blood transplantation at Duke University from 2010 to 2015 were included in this study. The conditioning regimen consisted of thiotepa 5 mg/kg/day i.v. x 2 days (days -11 to -10), TBI 150 cGy twice a day for total nine fractions (1350 cGy days -9 to -5), and fludarabine 40 mg/m2/day i.v. x 4 days (days -5 to -2). Cord blood units were matched to the recipient at 4 or more HLA loci (intermediate-resolution for A and B, high-resolution for DRB1). Graft versus host disease (GVHD) prophylaxis was with tacrolimus (target level 10-15 ng/ml) and mycophenolate mofetil 1000 mg TID. Antimicrobial prophylaxis and supportive care measures including GCSF administration until ANC > 1000 were conducted per institutional protocol. Probabilities of neutrophil and platelet recovery, acute and chronic GVHD, and treatment-related mortality were estimated by the cumulative incidence method. Relapse-free and overall survival rates were estimated by the Kaplan-Meier method. Results: Thirty-one patients (median age 46 years; range, 19-65) with hematologic malignancies were evaluated. Twenty-four patients (77%) had acute leukemia or myelodysplastic syndrome, while 7 patients (23%) had non-Hodgkin's lymphoma or multiple myeloma. By the "Disease Risk Index" (Armand P et al. Blood. 2014), 20 patients (65%) had low or intermediate risk disease, while 11 patients (35%) had high or very high risk disease. 30 patients underwent double UCB and 1 patient received single UCB transplantation. The median cryopreserved total nucleated cell dose was 5.4 x 107/kg (range: 3.2-8.4 x 107/kg). The cumulative incidence of neutrophil engraftment was 90% (95% CI, 82%-99%; Figure 1) at a median time of 21 days (95% CI, 19-26). Three patients did not have neutrophil engraftment; two patients had early death at days 7 and 14 prior to engraftment, while one patient had graft failure requiring second transplant. The cumulative incidence of platelet engraftment was 86% (95% CI, 75%-97%) at a median time of 47 days (95% CI, 37-73). Cumulative incidences of grades II-IV and grades III-IV acute GVHD were 48% (95% CI, 34%-69%) and 10% (95% CI, 3%-28%), respectively. The overall incidence of chronic GVHD was 40% (95% CI, 27%-59%), with 17% (95% CI, 8%-37%) of patients experiencing moderate to severe chronic GVHD. Treatment-related mortality at 6 months was 13% (Figure 2), while at 1 year and 3 years was 27% and 33%, respectively. With a median follow-up of 35.5 months (95% CI, 12.7-52.2), disease-free and overall survival at 3 years was 51% (95% CI, 29%-69%) and 57% (95% CI, 36%-73%), respectively. Conclusion: UCB transplantation with the modified myeloablative conditioning regimen of TBI, fludarabine, and thiotepa results in reliable neutrophil engraftment with reduced early treatment related mortality as compared to standard myeloablative conditioning consisting of TBI, fludarabine, and cyclophosphamide. It provides a promising disease-free and overall survival in an older (median age 46), heterogeneous patient population. This regimen represents a reasonable alternative to standard conditioning with TBI, fludarabine, and cyclophosphamide and warrants further study. Figure 1 Figure 1. Figure 2 Figure 2. Disclosures No relevant conflicts of interest to declare.

Total Body Irradiation 1350cGy/Fludarabine (TBI/FLU) vs Myeloablative Busulfan/Fludarabine (Bu/Flu) Preparation in Adult Recipients of Dual Umbilical Cord Blood (UCB) Transplantation: Superior Engraftment with Low Treatment-Related Mortality

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 4403-4403
Author(s):  
Mitchell Horwitz ◽  
John Chute ◽  
Cristina Gasparetto ◽  
Gwynn Long ◽  
David Rizzieri ◽  
...  
Keyword(s):  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Graft Failure ◽  
Cord Blood Transplantation ◽  
Umbilical Cord Blood Transplantation ◽  
Cell Dose ◽  
Blood Transplantation ◽  
Treatment Related Mortality ◽  
Related Mortality

Abstract A high graft failure rate due to low stem cell dose and high treatment-related mortality have historically been the major pitfalls of myeloablative adult umbilical cord blood transplantation. The goal of this phase II clinical trial was to identify an approach that addresses both of these problems. There is compelling evidence that increasing the cell dose with the use of two partially matched UCB grafts reduces the graft failure rate. While non-myeloablative preparative regimens reduce treatment-related mortality, many patients with high-risk hematologic malignancies may be at increased risk for disease relapse following transplantation. Recently, myeloablative Bu/Flu has gained acceptance as an alternative to standard myeloablative regimens due to published treatment related mortality (TRM) rates as low as 3%. We recently reported an 80% graft failure rate when Bu 130mg/m2 daily × 4 and Flu 160mg/m2 is followed by dual UCB transplantation in adult recipients (Horwitz et al. BBMT 2008). We now report early results of a concurrent cohort of patients, treated on the same prospective clinical trial, who were prepared with myeloablative TBI (1350cGy)/Flu (160mg/m2). Methods: 16 patients with a median age of 35 (range 21–55) signed consent for the trial. All patients had high risk hematologic malignancies including AML(CR2) 7, ALL(CR1 or CR2) 4, MDS 2, NHL 3. The UCB grafts were at least 4 of 6 matched (antigen level class I, allele level class II) with the recipient and 3 of 6 matched with each other. Each graft contained a minimum cell dose of 1.5 × 107/kg providing a minimum combined total nucleated cell dose of 3 × 107/kg. Tacrolimus and mycophenolate mofetil were used for GvHD prophylaxis and G-CSF was administered until the neutrophil count exceeded 1000/mm3. Voriconazole, acyclovir and ciprofloxacin were used as anti-infective prophylaxis for at least 3 months post transplantation. Results: With a median follow-up of 15 months, the Kaplan-Meier event-free and overall survival is 61% and 56%, respectively. Three patients experienced graft failure. Hematopoiesis was restored in all three patients with either autologous (2) or allogeneic (1) hematopoietic stem cells. The remainder of patients evaluable for engraftment (competing risk; relapse) achieved >90% donor myeloid chimerism from a single dominant UCB graft. The cumulative incidence of neutrophil engraftment (ANC>500) and platelet engraftment (>50K) is 79% and 75%, respectively. The median time to neutrophil and platelet engraftment was 27 days and 47 days, respectively. Toxic death occurred in 2 patients, resulting in a treatment-related mortality at 6 months of only 9%. In summary, the combination of myeloablative TBI and fludarabine is superior to Bu/Flu in the setting of umbilical cord blood transplantation. This is likely attributable to more effective host immunosuppression provided by the TBI. Acute GvHD occurred in 4 of 9 patients at risk for this complication (Grade II-3, Grade III-1). Chronic GvHD occurred in 2 patients (limited-1, extensive-1). Like the Bu/Flu regimen, we find the TBI/Flu regimen to be well tolerated, resulting in a notably low treatment-related mortality rate compared to more conventional myeloablative drug combinations. Conclusion: We find the approach consisting of myeloablative TBI/Flu preparation followed by dual umbilical cord blood transplantation in adult patients to be promising and worthy of further investigation.

scholarly journals Adult cord blood transplant results in comparable overall survival and improved GRFS vs matched related transplant

2020 ◽  
Vol 4 (10) ◽  
pp. 2227-2235
Author(s):  
Prashant Sharma ◽  
Enkhtsetseg Purev ◽  
Bradley Haverkos ◽  
Daniel A. Pollyea ◽  
Evan Cherry ◽  
...  
Keyword(s):  
Overall Survival ◽  
Cord Blood ◽  
Cumulative Incidence ◽  
Cord Blood Transplantation ◽  
Chronic Gvhd ◽  
Blood Transplantation ◽  
Cord Blood Transplant ◽  
Conditioning Regimens ◽  
Related Donor

Abstract We compared outcomes among adult matched related donor (MRD) patients undergoing peripheral blood stem cell transplantation and adult patients undergoing double unit cord blood transplantation (CBT) at our center between 2010 and 2017. A total of 190 CBT patients were compared with 123 MRD patients. Median follow-up was 896 days (range, 169-3350) among surviving CBT patients and 1262 days (range, 249-3327) among surviving MRD patients. Comparing all CBT with all MRD patients, overall survival (OS) was comparable (P = .61) and graft-versus-host disease (GVHD) relapse-free survival (GRFS) was significantly improved among CBT patients (P = .0056), primarily because of decreased moderate to severe chronic GVHD following CBT (P < .0001; hazard ratio [HR], 3.99; 95% confidence interval [CI], 2.26-7.04). Among patients undergoing our most commonly used MRD and umbilical cord blood (CB) myeloablative regimens, OS was comparable (P = .136) and GRFS was significantly improved among CBT patients (P = .006). Cumulative incidence of relapse trended toward decreased in the CBT group (P = .075; HR, 1.85; CI 0.94-3.67), whereas transplant-related mortality (TRM) was comparable (P = .55; HR, 0.75; CI, 0.29-1.95). Among patients undergoing our most commonly used nonmyeloablative regimens, OS and GRFS were comparable (P = .158 and P = .697). Cumulative incidence of both relapse and TRM were comparable (P = .32; HR, 1.35; CI, 0.75-2.5 for relapse and P = .14; HR, 0.482; CI, 0.18-1.23 for TRM). Our outcomes support the efficacy of CBT and suggest that among patients able to tolerate more intensive conditioning regimens at high risk for relapse, CB may be the preferred donor source.

Analysis of 120 Pediatric Patients with Non-Malignant Disorders Transplanted Using Unrelated Plasma Depleted Cord Blood and the Role of Post-Thaw Wash

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 4406-4406
Author(s):  
Joseph Rosenthal ◽  
Tang-Her Jaing ◽  
Lee Lee Chan ◽  
Gretchen Eames ◽  
Michael L. Graham ◽  
...  
Keyword(s):  
Overall Survival ◽  
Cord Blood ◽  
Cumulative Incidence ◽  
Pediatric Patients ◽  
Acute Gvhd ◽  
Chronic Gvhd ◽  
Disease Free Survival ◽  
Free Survival ◽  
Disease Free ◽  
Related Mortality

Abstract Unrelated cord blood (UCB) is an important stem cell source for unrelated hematopoietic cell transplantation of patients with non-malignant disorders. Cell dosage is a critical factor for successful UCB hematopoietic stem cell transplantation (HSCT). The red cell reduced (RCR) and post-thaw wash techniques that are widely used incur significant nucleated cell loss. Three strategies were employed to maximize cell dose and improve outcome–use of cord blood processed with plasma depletion without red blood cell reduction (PD CB), avoidance of post-thaw wash, and the use of double cords (2X) when necessary. A CIBMTR-audited analysis was performed on all 120 pediatric patients with non-malignant disorders transplanted with PD CB at 29 U.S. and 17 international centers. Transplant characteristics: median age 3.5 years (range 0.1–14); median patient weight 15 kg (range 4–61); male 58%. The majority of patients (n=58; 55%) were Asian. Twenty-two (21%) patients were Hispanic, 15 (14%) were Caucasian, 6 (6%) were African-American, and three (3%) were of Middle Eastern background. HLA ABDR matches: 6/6–26; 5/6–48; 4/6–47; 3/6 or 2/6–6; median pre-freeze nucleated cell dose 10.5×107/kg; median pre-freeze CD34+ dose 3.7×105/kg; non-myeloablative regimen 24%; 58% infused without post-thaw wash (NW). Myeloid engraftment defined as ANC≥500 and 6-month platelet engraftment defined as ≥ 20K and ≥ 50K are 89±8%, 88±8%, and 84±6% respectively. The median time to myeloid and platelet engraftment are 21 days (range 11–64), 49 days (range 13–155), and 61.5 days (range 21–205) respectively. No major adverse event was observed in either the W or the NW group. The cumulative incidence of reported grade II–IV acute GVHD was 38±5%, and 19±4% had grade III–IV acute GVHD. 36±6% developed limited chronic GVHD, and 12±4% developed extensive chronic GVHD. With a median follow-up of 329 days (range 3–1928 days), the Kaplan-Meier estimates of 1-year TRM, OS and diseasefree survival were 20±6%, 88±6% and 72±6% respectively. Foregoing post-thaw wash for PD CB transplantation improved neutrophil (RR=1.75; p=0.01) and platelet engraftment (RR=1.72; p=0.02) and reduced TRM (RR=0.38; p=0.04). This series demonstrated that unrelated PD CB transplantation can be performed safely and effectively in children with life-threatening, non-malignant disorders. Additionally, the results demonstrate possible improvement in myeloid and platelet engraftment, overall and disease-free survival when post-thaw wash is not employed. Table 1. Summary of overall results Outcome All Patients N = 120 Washed CB N = 48 Unwashed CB N = 71 RR (Wash=Ref) P-value ANC500 Engraftment Cumulative Incidence Median # Days to Engraftment 87±6% d+21 86±9% d+25 89±8% d+19 1.75 0.01 Platelet 20K Engraftment Cumulative Incidence Median # Days to Engraftment 81±6% d+49 75±9% d+52 88±9% d+43 1.72 0.02 Autologous Recovery 3±2% 2±2% 4±3% 1.06 0.95 Acute GvHD II–IV Acute GvHD III–IV 38±5% 19±4% 31±7% 17±6% 45±7% 21±6% 1.74 1.38 0.11 0.50 Chronic GvHD Limited Chronic GvHD Extensive 36±6% 12±4% 14±6% 19±6% 60±10% 6±4% 5.69 0.24 <0.001 0.08 Transplant-Related Mortality–100 Day Transplant-Related Mortality–3 Yr 10±3% 20±4% 11±5% 34±8% 9±4% 11±4% 0.38 0.04 Overall Survival–1 Yr Overall Survival–3 Yr 79±4% 79±4% 66±8% 66±8% 88±4% 88±4% 0.43 0.06 Disease-Free Survival–1 Yr Disease-Free Survival–3 Yr 72±5% 70±6% 58±9% 51±10% 84±5% 84±5% 0.48 0.07

Clinical Characteristics and GVL Effect of Chronic Graft-Versus-Host disease Following Reduced-Intensity Umbilical Cord Blood Transplantation (RICBT).

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 1162-1162
Author(s):  
Atsushi Wake ◽  
Naoyuki Uchida ◽  
Kazuya Ishiwata ◽  
Hideki Araoka ◽  
Masanori Tsuji ◽  
...  
Keyword(s):  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Cord Blood Transplantation ◽  
Chronic Gvhd ◽  
Hematological Diseases ◽  
Blood Transplantation ◽  
Nih Consensus Criteria ◽  
Reduced Intensity ◽  
Observation Period

Abstract Abstract 1162 Poster Board I-184 Backgrounds Umbilical cord blood can be an alternative stem cell source for the patients of hematological diseases. However, little is known about chronic GVHD (cGVHD) and graft versus leukemia/lymphoma (GVL) effect in reduced-intensity cord blood transplantation (RICBT). We had been demonstrated that cGVHD in CBT is tolerable compared with that in BMT and that the occurrence of cGVHD could result in good prognosis. Here, we analyzed the clinical picture of chronic GVHD following RICBT and the GVL effect. Methods We reviewed medical records of 192 patients with hematological diseases who had received CBT between Jan. 2004 and Dec. 2008 who had been free from disease progression for more than 100 days after RICBT at Toranomon Hospital, Tokyo, Japan. Median age was 54 years (17-82). Most of them had diseases in advanced status (n=168). Most of the pre-transplant conditioning were reduced intensity consisted of fludarabine, melphalan and TBI 4Gy (n=157). GVHD prophylaxis were tacrolimus (Tac) alone (n=99) and Tac plus mycophenolate mofetil (MMF) (n=93). HLA disparities were as follows; 6/6 (n=9), 5/6 (n=38), 4/6 (n=142), and 3/6 (n=3). Underlying diseases were AML (n=58), myelodysplastic syndrome (n=36), ALL (n=23), lymphoma (n=64) and others (n=11). Results The Median observation period after the transplantation was 924 days (range, 109–1944). Chronic GVHD was admitted in 114 patients (59.4%) consisted of limited type 88 (45.8%) and extensive type 26 (13.5%) in classical criteria, and mild type 96 (50.0%), moderate type 15 (7.8%), and severe type 3 (1.6%) in NIH consensus criteria of cGVHD. The target organs of cGVHD were skin 87.5%, liver 40.6%, and mouth mucous membranes 32.8 %, eye 23.4%, and the lungs only 7.8% (COP3 and BOS2). Except 21 cases ( 10.9%) required systemic steroid or MMF therapy. The median of Karnofsky score of cGVHD was 90%(40-100). During observation period, no patients except one patient caused by heart failure were died of cGVHD. In multivariate analysis, high-risk disease (p=0.019) and preceding acute GVHD (p=0.026) are related to the occurrence of cGVHD, and cGVHD increased overall survival (p<0.01) and suppressed recurrence of the disease (p<0.01). Conclusion Although the frequency of cGVHD was not low, the severity was mild, and the death related to cGVHD is rare in RICBT. NIH consensus criteria is useful for the evaluation of cGVHD severity. Some effect of GVL may play a role on better survival and lower relapse rate in RICBT. Disclosures No relevant conflicts of interest to declare.

scholarly journals Unrelated donor umbilical cord blood transplantation for inherited metabolic disorders in 159 pediatric patients from a single center: influence of cellular composition of the graft on transplantation outcomes

Blood ◽  
2008 ◽  
Vol 112 (7) ◽  
pp. 2979-2989 ◽  
Author(s):  
Vinod K. Prasad ◽  
Adam Mendizabal ◽  
Suhag H. Parikh ◽  
Paul Szabolcs ◽  
Timothy A. Driscoll ◽  
...  
Keyword(s):  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Metabolic Disorders ◽  
Cord Blood Transplantation ◽  
Chronic Gvhd ◽  
Young Patients ◽  
Unrelated Donor ◽  
Inherited Metabolic Disorders ◽  
The Impact

Abstract Outcomes of 159 young patients with inherited metabolic disorders (IMDs) undergoing transplantation with partially HLA-mismatched unrelated donor umbilical cord blood were studied to investigate the impact of graft and patient characteristics on engraftment, overall survival (OS), and graft-versus-host disease (GVHD). Patients received myeloablative chemotherapy (busulfan, cyclophosphamide, ATG) and cyclosporine-based GVHD prophylaxis. Infused cell doses were high (7.57 × 107/kg) because of the patients' young age (median, 1.5 years) and small size (median, 12 kg). Median follow-up was 4.2 years (range, 1-11 years). The cumulative incidences of neutrophil and platelet engraftment were 87.1% (95% confidence interval [CI], 81.8%-92.4%) and 71.0% (95% CI, 63.7%-78.3%). A total of 97% achieved high (> 90%) donor chimerism. Serum enzyme normalized in 97% of patients with diseases for which testings exist. Grade III/IV acute GVHD occurred in 10.3% (95% CI, 5.4%-15.2%) of patients. Extensive chronic GVHD occurred in 10.8% (95% CI, 5.7%-15.9%) of patients by 1 year. OS at 1 and 5 years was 71.8% (95% CI, 64.7%-78.9%) and 58.2% (95% CI, 49.7%-66.6%) in all patients and 84.5% (95% CI, 77.0%-92.0%) and 75.7% (95% CI, 66.1%-85.3%) in patients with high (80-100) performance score. In multivariate analysis, favorable factors for OS were high pretransplantation performance status, matched donor/recipient ethnicity, and higher infused colony forming units.

scholarly journals Donor-specific anti-HLA antibodies predict outcome in double umbilical cord blood transplantation

Blood ◽  
2011 ◽  
Vol 118 (25) ◽  
pp. 6691-6697 ◽  
Author(s):  
Corey Cutler ◽  
Haesook T. Kim ◽  
Lixian Sun ◽  
Doreen Sese ◽  
Brett Glotzbecker ◽  
...  
Keyword(s):  
Overall Survival ◽  
Cord Blood ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Graft Failure ◽  
Cord Blood Transplantation ◽  
Umbilical Cord Blood Transplantation ◽  
Hla Antibodies ◽  
Fluorescent Intensity ◽  
Blood Transplantation

Abstract Using a uniform detection method for donor-specific anti-HLA antibodies (DSAs), we sought to determine the effect of preformed DSAs on outcomes in double umbilical cord blood transplantation. DSAs were associated with an increased incidence of graft failure (5.5% vs 18.2% vs 57.1% for none, single, or dual DSA positivity; P = .0001), prolongation of the time to neutrophil engraftment (21 vs 29 days for none vs any DSA; P = .04), and excess 100-day mortality or relapse (23.6% vs 36.4% vs 71.4% for none, single, or dual DSA positivity; P = .01). The intensity of DSA reactivity was correlated with graft failure (median of mean fluorescent intensity 17 650 vs 1 850; P = .039). There was inferior long-term progression-free and overall survival when comparing patients with DSAs against both umbilical cord blood units to those without DSAs (3-year progression-free survival, 0% vs 33.5%, P = .004; 3-year overall survival 0% vs 45.0%, P = .04). We conclude that identification of preformed DSAs in umbilical cord blood recipients should be performed and that the use of umbilical cord blood units where preformed host DSAs exist should be avoided.

scholarly journals Impact of ABO Blood Group Incompatibility on Outcomes after Single-Unit Umbilical Cord Blood Transplantation for Malignant Hematological Disease

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 2055-2055
Author(s):  
Cheng Siqi ◽  
Baolin Tang ◽  
Xiaoyu Zhu ◽  
Huilan Liu ◽  
Kaidi Song ◽  
...  
Keyword(s):  
Cord Blood ◽  
Blood Group ◽  
Umbilical Cord ◽  
Umbilical Cord Blood ◽  
Cumulative Incidence ◽  
Single Unit ◽  
Cord Blood Transplantation ◽  
Abo Blood Group ◽  
Abo Incompatibility ◽  
Significant Difference

Objective In contrast to solid organ transplantation, ABO blood group incompatibility was acceptable in allogeneic hematopoietic stem cell transplantation (allo-HSCT). However, reports of the effect of donor-recipient ABO incompatibility on long-time survival, graft-versus-host disease (GVHD), and relapse after allo-HSCT were controversial. Relatively few reports existed on the effects of ABO incompatibility after umbilical cord blood transplantation (UCBT). The aim of this study was to investigate the role of major ABO incompatibility on RBC transfusion burden, hematologic recovery, GVHD, transplant-related mortality (TRM), relapse, and overall survival (OS) in UCBT for malignant disease. Methods This retrospective study included 587 malignant hematonosis patients who received myeloablative single-unit unrelated donor UCBT at our center between May 2008 and June 2018. Median follow-up time of the patients alive was 40.7 months (range: 12.0-134.6 months). A total of 230 (39.2%) patients received an ABO-identical transplant, and 357 (60.8%) received ABO-mismatched transplants, including 161 (27.4%) minor, 141 (24.0%) major, and 55 (9.4%) bidirectional ABO-incompatible UCBTs. All patients received myeloablative conditioning regimens and cyclosporine A (CsA) combined with mycophenolate mofetil (MMF) as a GVHD prophylaxis. Results A comparison of ABO compatibility and incompatibility demonstrated no significant differences (P>0.05) in the cumulative incidence of neutrophil, platelet, and red blood cell engraftment . There was no significant difference in the cumulative incidence of grades Ⅱ to Ⅳ aGVHD (P= .527) and Ⅲ to Ⅳ aGVHD (P= .949) among the 4 groups (Figure A , B). In univariate analysis, ABO blood group incompatibility was not associated with cumulative incidence of 180d TRM (Figure C, P= .602). The overall 3-year survival had no statistically significant differences among the 4 groups (Figure D; P= .384). Further, 11 patients were excluded from the analysis of post-UCBT RBC transfusion burden because of missing data and non-red blood cell engraftment. Of the remaining 576 patients, the median number of RBC transfusions during transplant days 0 to 60 was 4 (range, 0 to 106). There was no significant difference in the transfusion burden among all ABO blood type mismatch groups (Table 1, P = .069). Furthermore, none of the patients developed pure red aplastic anemia (PRCA) after UCBT. Conclusion The results showed that ABO blood group incompatibility had no significant impact on hematologic engraftment, the occurrence of GVHD, and the survival of malignant hemoblastosis. Patients with myeloablative single-unit UCBT may not develop PRCA; Donor-recipient ABO incompatibility may not be the major consideration in the selection of umbilical cord blood. Disclosures No relevant conflicts of interest to declare.

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