Variety Of Conditioning Regimens Research Articles

Peripheral Blood Haploidentical Allogeneic Stem Cell Transplantation in Older Adults with Acute Myeloid Leukemia and Myelodysplastic Syndromes Demonstrates Long Term Survival, Results from Australia and New Zealand Transplant and Cellular Therapies

There is a limited body of evidence for haploidentical hematopoietic stem cell transplantation (haplo-HSCT) in older patients. Previous studies have used a high proportion of bone marrow–derived grafts and a variety of conditioning regimens. In Australia and New Zealand, haplo-HCST is predominantly performed using peripheral blood (PB) with universal use of post-transplantation cyclophosphamide (PTCy). To characterize the outcomes of older recipients undergoing haplo-HSCT for acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS). Data were collected through the Australasian Bone Marrow Transplant Recipient Registry (ABMTRR) for patients aged 65 or older receiving a PB haplo-HSCT for AML/MDS between January 2010 and July 2020. A total of 44 patients were included in the analysis. The median follow-up time was 377 days. The median age was 68 (range 65-74) with a median Karnofsky performance status of 90. Thirty patients (68.2%) had AML, whereas 14 (31.8%) had MDS. The median donor age was 40. The most common conditioning regimen was nonmyeloablative fludarabine, cyclophosphamide, and total body irradiation (75%); the remainder of the patients received either melphalan- or busulfan-based regimens, and the majority were reduced intensity, with only 2 patients undergoing myeloablative conditioning. All patients received post-transplantation cyclophosphamide and mycophenolate mofetil, with the majority also receiving tacrolimus (90.5%) and the remainder receiving cyclosporine (9.5%). No patients received anti-thymocyte globulin. Neutrophil engraftment was achieved in 97.6% of patients at a median of 18 days, whereas platelet engraftment was achieved in 92.7% of patients at a median of 28 days. The cumulative incidences of cytomegalovirus (CMV) reactivation and CMV disease were 52.5% and 5.1% at 1 year. The incidence of grade 2-4 acute Graft Versus Host Disease (GVHD) was 18.2%. The incidence of chronic GVHD at 2 years was 40.7%, with extensive chronic GVHD occurring in 17.7% of patients. The incidences of relapse and non-relapse mortality (NRM) at 2 years were 8.8% and 20.7% respectively. The leading causes of death were infection (64.7%) followed by relapse (14.2%). The 2-year overall survival was 74%. Relapse free survival and GVHD free, relapse free survival at 2 years was 70% and 48%. Haplo-HSCT using a peripheral blood graft and PTCy GVHD prophylaxis demonstrates long-term disease control with acceptable rates of NRM for older patients with AML/MDS.

A phase 1b study to evaluate the efficacy, safety, and pharmacokinetics of an investigational microbiome therapeutic, SER-155, in adults undergoing hematopoietic stem cell transplantation.

TPS7080 Background: In patients undergoing allogeneic hematopoietic cell transplantation (HCT), loss of gastrointestinal microbial diversity is associated with risk of bloodstream infections (BSI), acute graft-versus-host disease (aGvHD), and death. SER-155 is a rationally designed investigational cultivated microbiome therapeutic, hypothesized to improve clinical outcomes in HCT by restoring colonization resistance to potential pathogens, promoting epithelial barrier integrity, and reducing colonic inflammation. SER-155-001 is a Phase 1b study evaluating the efficacy, safety, and pharmacokinetics (PK) of SER-155 in adults undergoing HCT. Methods: This study will enroll approximately 70 subjects ≥18 years in an open-label Cohort 1 (n = 10) followed by a double-blind, placebo-controlled Cohort 2 (n = 60) randomized 1:1 to SER-155 or placebo. A variety of conditioning regimens, donor types, and GVHD-prophylaxis regimens are included. Exclusion criteria include history of severe colitis or active inflammatory bowel disease or total colectomy, umbilical cord blood or ex vivo T-cell depletion, exposure to fecal microbiota transplant or any live microbial therapeutic within 3 months prior to screening, and evidence of relapse or progression of hematologic malignancy (minimal residual disease is allowed). Following screening, participants in both cohorts receive 2 treatment courses (one before and one after HCT), each comprised of microbiome conditioning with oral vancomycin or placebo followed by SER-155 or placebo, plus a conditional 3rd treatment course if the subject receives antibiotics. Safety outcomes are followed through 52 weeks post HCT. The primary endpoint is the incidence and severity of adverse events, serious adverse events, and adverse events of special interest. Secondary endpoints include rates of BSI, gastrointestinal infections, aGvHD, febrile neutropenia and overall survival. Microbiome related endpoints include engraftment of SER-155 bacterial strains in the gastrointestinal tract (PK endpoint) and fecal microbiome diversity, composition and metabolites. Results: Cohort 1 enrollment is complete, with 13 participants receiving SER-155. In December 2022, the Data and Safety Monitoring Committee supported continuation to Cohort 2 enrollment following review of safety data from Cohort 1. Enrollment in Cohort 2 is underway. Conclusions: This Phase 1b study is designed to assess the safety, and clinical efficacy of SER-155 in allogeneic HCT, expanding the clinical experience of microbiome- directed interventions in allogeneic HCT recipients. Clinical trial information: NCT04995653 .

Peripheral Blood Haploidentical Allogeneic Stem Cell Transplantation in Older Adults with AML/MDS Demonstrates Excellent Long Term Overall Survival, Results from the Australasian Bone Marrow Transplant Recipient Registry

Background: Haploidentical Hematopoietic Stem Cell Transplantation (Haplo-HCT) is an established therapy using alternative donors for patients with Acute Myeloid Leukaemia (AML) and Myelodysplastic Syndromes (MDS). There is a limited body of evidence for older patients undergoing Haplo-HCT in AML and MDS. Studies describing Haplo-HCT in older patients have used a high proportion of bone marrow (BM) derived grafts and a variety of conditioning regimens. In this setting, Haplo-HCT demonstrates acceptable Non-Relapse Mortality (NRM) and chronic Graft Versus Host Disease (cGVHD) rates of less than 10% (Ciurea. Biology of Blood and Marrow Transplantation. 2018 Jun 1;24(6):1232-6.). In Australia and New Zealand, Haplo-HCT is predominantly performed using peripheral blood (PB). We performed a retrospective national registry study to examine the outcomes of Haplo-HCT using PB in older patients.Methods: Data was collected through the Australasian Bone Marrow Transplant Recipient Registry (ABMTRR) for patients aged 65 or older receiving a PB Haplo-HCT for AML/MDS between January 2010 and July 2020. Cumulative incidence functions were used for engraftment, CMV reactivation, acute GVHD, chronic GVHD, relapse, and NRM. The competing risk for engraftment, CMV reactivation and GVHD was death. Relapse and NRM were competing risks for each other. Overall survival (OS), relapse-free survival (RFS), and composite GVHD and RFS (GRFS) were calculated using Kaplan-Meier analyses. The impact of pre-transplant factors on these endpoints was analyzed using Cox regression.Results: A total of 44 patients were included in the analysis. The median follow-up time was 734 days. The median age was 68 (range 65-74) with a median Karnofsky Performance Status of 90. Thirty patients (68.2%) had AML while 14 (31.8%) had MDS. The median donor age was 40. The most common conditioning regimen was non-myeloablative fludarabine, cyclophosphamide and TBI (73.8%), the remainder of the patients received either melphalan or busulfan based regimens, the majority were reduced intensity with only 2 patients undergoing myeloablative conditioning. All patients received post-transplant cyclophosphamide and mycophenolate mofetil with the majority also receiving tacrolimus (90.5%) and the remainder receiving cyclosporin (9.5%). No patients received anti-thymocyte globulin.Neutrophil engraftment was achieved in 97.6% of patients, at a median of 18 days while platelet engraftment was achieved in 92.7% of patients at a median of 28 days. The cumulative incidences of CMV reactivation and CMV disease were 52.5% and 5.1% at 1 year The incidence of Grade 2-4 aGVHD was 18.2%. The incidence of cGVHD at 2 years was 40.7%, with extensive cGVHD occurring in 17.7% of patients. The incidences of relapse and NRM at 2 years were 8.8%. and 20.7% respectively. The leading causes of death were infection (64.7%) followed by relapse (14.2%). The 2-year OS was 74%. RFS and GRFS at 2 years was 70% and 48% (Figure 1). Recipient age, donor age or disease type (AML vs MDS) had no significant impact on OS or GRFS.Conclusion: These results confirm the safety and effectiveness of Haplo-HCT for AML/MDS in older patients. The rates of cGVHD were higher than expected given the lower rates reported in other studies using PTCy GVHD prophylaxis. Haplo-HCT using a PB graft demonstrates good long-term disease control with reasonable rates of NRM and cGVHD for older patients with AML/MDS. [Display omitted] DisclosuresBajel: Abbvie, Amgen, Novartis, Pfizer: Honoraria; Amgen: Speakers Bureau. Perera: Abbvie: Speakers Bureau; BMS: Speakers Bureau. Greenwood: Jazz Pharmaceuticals: Membership on an entity's Board of Directors or advisory committees; Servier: Membership on an entity's Board of Directors or advisory committees, Research Funding; Pfizer: Membership on an entity's Board of Directors or advisory committees; Amgen: Membership on an entity's Board of Directors or advisory committees, Research Funding. Hamad: Novartis: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau.

Prevention of oral mucositis with cryotherapy in children undergoing hematopoietic stem cell transplantations\u2014a feasibility study and randomized controlled trial

PurposeTo evaluate the feasibility of oral cryotherapy (OC) in children and to investigate if OC reduces the incidence of severe oral mucositis (OM), oral pain, and opioid use in children undergoing hematopoietic stem cell transplantation (HSCT).MethodsFifty-three children, 4–17 years old, scheduled for HSCT in Sweden were included and randomized to OC or control using a computer-generated list. OC instructions were to cool the mouth with ice for as long as possible during chemotherapy infusions with an intended time of ≥ 30 min. Feasibility criteria in the OC group were as follows: (1) compliance ≥ 70%; (2) considerable discomfort during OC < 20%; (3) no serious adverse events; and (4) ice administered to all children. Grade of OM and oral pain was recorded daily using the WHO-Oral Toxicity Scale (WHO-OTS), Children’s International Oral Mucositis Evaluation Scale, and Numerical Rating Scale. Use of opioids was collected from the medical records.ResultsForty-nine children (mean age 10.5 years) were included in analysis (OC = 26, control = 23). The feasibility criteria were not met. Compliance was poor, especially for the younger children, and only 15 children (58%) used OC as instructed. Severe OM (WHO-OTS ≥ 3) was recorded in 26 children (OC = 15, control = 11). OC did not reduce the incidence of severe OM, oral pain, or opioid use.ConclusionThe feasibility criteria were not met, and the RCT could not show that OC reduces the incidence of severe OM, oral pain, or opioid use in pediatric patients treated with a variety of conditioning regimens for HSCT.Trial registrationClinicalTrials.gov id: NCT01789658

Allogeneic Hematopoietic Stem Cell Transplantation (alloHSCT) for Children and Young Adults with T-Cell Acute Lymphoblastic Leukemia (T-ALL) Treated at Investigator Discretion: A Report from Children's Oncology Group (COG) AALL0434

Introduction: Salvage therapies in children and young adults with relapsed T-ALL are successful in <10% of patients, thus relapse prevention is a first priority. Contemporary strategies have included the use of intensified multi-agent regimens, novel therapies, and alloHSCT. COG AALL0434 did not include an alloHSCT treatment arm. To mitigate the risk of relapse, some patients were taken off study and, at investigator discretion, referred for alloHSCT. We retrospectively collected data to identify which patients were taken off study, either during induction, or after end-induction risk assignment to receive alloHSCT, for reasons other than relapse. In particular, it was unknown how alloHSCT affected the outcomes for patients with specific subsets of disease, such as induction failure (IF) or with the early thymic precursor (ETP) phenotype.Patients and Methods: From 2007-2014, AALL0434 enrolled 1,895 patients (1,596 T-ALL) and included a 2 x 2 pseudo-factorial randomization using a COG-modified BFM regimen. Patients were randomized to receive escalating dose methotrexate without leucovorin rescue plus pegaspargase (CMTX) or High Dose MTX (HDMTX) with leucovorin rescue in a single Interim Maintenance phase, with or without six 5-day courses of nelarabine. No patients were risk stratified on the basis of ETP. Participants with ≥ 25% marrow blasts on day 29 of induction (IF) were assigned to receive HDMTX with nelarabine. All patients with intermediate risk (IR), high risk (HR) or IF received cranial irradiation.Results: Among 1385 eligible, evaluable T-ALL patients for whom survey information was available, 333 (24%) were taken off therapy during induction prior to randomization. Thirty-two (9.6%) of these 333 subsequently underwent alloHSCT (19 with M1, 9 with M2 and 4 with unknown Day 29 marrow status). At the end of induction, 1052 patients were risk stratified and consented to randomization. Of these, 43 patients (4.3%) were subsequently taken off protocol therapy for alloHSCT [0 low risk (LR), 2 IR, 21 HR and 20 IF]. For the 75 patients who were taken off protocol therapy during or after induction and underwent alloHSCT, time to transplantation from end induction ranged from 1 to 9 months (median 5) for the 20 IF patients, and from 1 to 30 months (median 4) for the 55 patients who achieved CR1. A variety of conditioning regimens were used, but most (80%) included total body irradiation. Five types of alloHSCTs were employed: matched unrelated in 37 (50%), matched related in 28 (38%), mismatched unrelated in 7 (10%), and mismatched related and unknown (1 each (1.4%)). Stem cells sources were bone marrow in 50 (67%), umbilical cord blood in 14 (19%) and peripheral blood in 11 (15%). Multivariate analyses on all 75 patients (adjusting for treatment arm and risk group, and using time-dependent covariates for time to HSCT) showed worse outcomes for those who received alloHSCT versus chemotherapy [Hazard ratio 3.46 (95% Confidence Interval 1.39 - 8.60); P = 0.008]. For IF patients, there was no difference in outcome for those receiving chemotherapy versus alloHSCT [Hazard Ratio 0.75 (95% CI 0.27-2.14); P = 0.60]. Centrally determined ETP status was available for 1123 (81%) of the subjects (Table), which were categorized as ETP (11%), Near ETP (17%) and Not ETP (72%) (Wood, BL: Blood 2014: [21]1). Most patients were not taken off therapy during induction, but among those who were and had ETP/Near ETP, 21 of 28 (75%) received alloHSCT versus 71 of 251 (28%) who received chemotherapy alone (Fischer's exact test, P <0.001). In multivariate analyses adjusting for ETP status, alloHSCT (n=66) was associated with inferior EFS compared to chemotherapy [Hazard ratio 2.81 (95% CI of 1.49-5.31); P = 0.001], and ETP status did not have a statistically significant impact on EFS [Hazard Ratio 1.36 (95% CI of 0.87-2.120; P = 0.18].Conclusions: Our findings showed that only ~5% of participants in AALL0434 received alloHSCT, and that alloHSCT was employed in about half of those patients with IF. There was no EFS advantage for patients who failed induction and subsequently received alloHSCT. Patients were taken off protocol therapy and transplanted for a variety of reasons, which introduced heterogeneity. However, compared to those who received alloHSCT off therapy, we found that survival advantages favored those who received chemotherapy, regardless of ETP status. DisclosuresNo relevant conflicts of interest to declare.

Hematopoietic stem cell transplantation in patients with gain-of-function signal transducer and activator of transcription 1 mutations

Gain-of-function (GOF) mutations in signal transducer and activator of transcription 1 (STAT1) cause susceptibility to a range of infections, autoimmunity, immune dysregulation, and combined immunodeficiency. Disease manifestations can be mild or severe and life-threatening. Hematopoietic stem cell transplantation (HSCT) has been used in some patients with more severe symptoms to treat and cure the disorder. However, the outcome of HSCT for this disorder is not well established. We sought to aggregate the worldwide experience of HSCT in patients with GOF-STAT1 mutations and to assess outcomes, including donor engraftment, overall survival, graft-versus-host disease, and transplant-related complications. Data were collected from an international cohort of 15 patients with GOF-STAT1 mutations who had undergone HSCT using a variety of conditioning regimens and donor sources. Retrospective data collection allowed the outcome of transplantation to be assessed. Invitro functional testing was performed to confirm that each of the identified STAT1 variants was in fact a GOF mutation. Primary donor engraftment in this cohort of 15 patients with GOF-STAT1 mutations was 74%, and overall survival was only 40%. Secondary graft failure was common (50%), and posttransplantation event-free survival was poor (10% by 100days). Asubset of patients had hemophagocytic lymphohistiocytosis before transplant, contributing to their poor outcomes. Our data indicate that HSCT for patients with GOF-STAT1 mutations is curative but has significant risk of secondary graft failure and death.

Effect of T-Cell Dose On Outcomes After Peripheral Blood Allogeneic Hematopoietic Cell Transplantation in Hematological Malignancies.

Abstract 1171Poster Board I-193 Purpose:Peripheral blood allogeneic hematopoietic cell transplant (HCT) is used to treat various types of hematological malignancies. Current knowledge supports that increased CD34 + cell dose in the infusate is associated with earlier leukocyte recovery. The dose of CD3 +, CD4 + and CD8 + cells is largely disregarded except in T-cell depleted transplant. The correlation between various cell doses and outcomes is an area of great interest in HCT. Our analysis focuses on the impact of T-cell subset dosing, on outcomes after HCT, such as acute graft versus host disease (GVHD) and mortality. Methods:Retrospective analysis was conducted on 134 consecutive patients who underwent peripheral blood allogeneic HCT for various hematological malignancies in our institution between January 2003 and December 2008. Statistical analysis was performed using SPSS 15.0. The Chi - square test was used to determine any association between cell doses and the incidence of acute GVHD and all-cause mortality at one year of follow-up after transplant. Results were also compared with the association between CD3+ and CD8+ cell doses and incidence of acute GVHD as reported in 2007 by our institution. Results:A total of 134 patients were included in our analysis, consisting of 49 females and 85 males. The median age was 49 years (range 17-69). HCT was from matched related donors in 68 and from matched unrelated donors in 66 patients. A variety of conditioning regimens were used in preparation for the HCT. Overall survival at 1 year of follow-up was 60%, the incidence of acute GVHD was 52%, and chronic GVHD was 29%. All-cause mortality at one year follow up was found to be significantly higher when the CD3+ cell dose was < 30.5 × 107/kg IBW (49% vs. 29%, P = 0.018). All-cause mortality was also significantly increased when CD8+ cell dose was < 9.2 × 107/kg IBW (50% vs. 33%, P= 0.05). A CD8+ cell dose of < 9.2 × 107/kg IBW was also associated with an increased risk of grades 2-4 acute GVHD (48% vs. 22%, P = 0.026). There was no association of statistical significance between CD3+ and CD4+ cell doses and the incidence of acute GVHD. Conclusion:The data suggests a statistically significant inverse association between mortality and CD3+ cell dose of <30.5 × 107/kg IBW. A CD8+ cell dose of <9.2 × 107/kg IBW was also associated with increased all-cause mortality and acute GVHD (grades 2-4). Our institution reported in 2007, a significant association between the incidence of acute GVHD (grades 2-4) and CD3+ cell dose < 33.5 × 107/kg IBW and CD8+ cell dose of < 6.2 × 107/kg IBW, based on series of 66 patients. As we increased the sample size to 134, the association between CD3+ cell dose and acute GVHD was no more present.We conclude that T-cell dose is an important factor in terms of outcomes after all allogeneic HCT irrespective of preparative regimen. T-cell subsets likely play a pivotal role in transplant results, though it is not well described. Analysis of larger databases is required to substantiate our results. Disclosures:No relevant conflicts of interest to declare.

Outcome of Transplantation for Myelofibrosis

Myelofibrosis is a myeloproliferative disorder incurable with conventional strategies. Several small series have reported long-term disease-free survival (DSF) after allogeneic hematopoietic cell transplantation (HCT). In this study, we analyze the outcomes of 289 patients receiving allogeneic transplantation for primary myelofibrosis between 1989 and 2002, from the database of the Center for International Bone Marrow Transplant Research (CIBMTR). The median age was 47 years (range: 18-73 years). Donors were HLA identical siblings in 162 patients, unrelated individuals in 101 patients, and HLA nonidentical family members in 26 patients. Patients were treated with a variety of conditioning regimens and graft-versus-host disease (GVHD) prophylaxis regimens. Splenectomy was performed in 65 patients prior to transplantation. The 100-day treatment-related mortality was 18% for HLA identical sibling transplants, 35% for unrelated transplants, and 19% for transplants from alternative related donors. Corresponding 5-year overall survival (OS) rates were 37%, 30%, and 40%, respectively. DFS rates were 33%, 27%, and 22%, respectively. DFS for patients receiving reduced-intensity transplants was comparable: 39% for HLA identical sibling donors and 17% for unrelated donors at 3 years. In this large retrospective series, allogeneic transplantation for myelofibrosis resulted in long-term relapse-free survival (RFS) in about one-third of patients.

Safety of conditioning agents for allogeneic haematopoietic transplantation

Allogeneic stem cell transplantation (allo-SCT) for haematological malignancies became a safer approach in recent years, for example, owing to improved supportive strategies. However, despite the efficacy of the procedure, morbidity and mortality mainly caused by infections and organ toxicity remain serious problems. Due to the variety of conditioning regimens being applied before allo-SCT, one important aspect is represented by the toxicity profiles of the specific compounds, which are being applied for the reduction of the leukaemia cell load and for immunosuppression. This is being illustrated by the hepatotoxic profile of busulfan with its high rate of veno-occlusive disease. However, recent advances in our understanding of drug metabolism, progress in the measurement of drug concentration, and the invention of some new drugs and therapeutic approaches in the conditioning period are promising steps in achieving more safety for patients undergoing allo-SCT. Reduced-intensity conditioning concepts allow the inclusion of heavily pretreated patients or patients with severe co-morbidities in transplantation concepts. New prophylactic regimens, including poly- or monoclonal antibodies, result in reduced rates of graft-versus-host disease, and some ‘new’ drugs such as treosulfan or clofarabine widen the range of available conditioning regimens for specific situations.

An International Multi-Institutional Study of Double Cord Blood Transplantation in a Racially Diverse Population.

Cord blood (CB) is an alternative stem cell source for patients, but single CB products may not contain sufficient cell dose for cord blood transplantation (CBT) of adults. Double cord blood transplantation (DCBT) has been used to increase the cell dose, but the majority of reported patients have been Caucasian. We conducted a retrospective analysis of 89 consecutive DCBT recipients who received at least one CB product from the StemCyte CB banks. The median age was 20 years (range 1–63), with 58% over age 18, and the median weight was 60 kg (range 11–137), with 70% ≥ 50 kg. Diagnoses were: 29 ALL, 23 AML, 10 Thalassemia, 6 CML, 5 MDS, 4 AA, 3 lymphoma, and 9 others. 33% had IBMTR advanced disease status, 28% intermediate, 18% early, and 21% unknown status for the leukemia/lymphoma/MDS cases. 70% of the recipients with known race were non-Caucasian (NC) with 35 Asians (A), 24 Caucasians (C), 9 African Americans, 8 Hispanics, 3 Native Americans, 10 others. Patients were treated with a variety of conditioning regimens (33% reduced intensity) at 39 U.S. and international centers on 4 continents with 37% at non-US centers. Thirty-seven patients (42%) received both units as plasma depleted cord blood products. CB product characteristics were as follows: median pre-freeze TNC dose 3.8×107/kg, median pre-freeze CD34+ dose 1.4×105/kg. The median time to neutrophil (ANC500) engraftment was 21.5 days and the median time to platelet (Plt) 20K and 50K engraftment were 42 and 59 days respectively. Kaplan-Meier (KM) estimates of 100-day transplant related mortality (TRM), 1-year overall (OS) and disease free survival (DFS) were 37±6%, 50±6%, and 37±6% respectively. Causes of death include infection (26%), relapse (23%), multi-organ failure (16%), GvHD (2%), and other (33%). Engraftment correlated with cell dose and disease risk status in univariate analysis. Survival correlated with higher pre-freeze TNC dose (p=.03), higher pre-freeze CD34+ dose (p=.04), and non-washed CB (p=.01). Survival, disease-free survival, ANC 500, plt 20K, and 50K engraftment, and TRM were not different between C and NC or between A and Non-Asians (NA) in multivariate analyses. 1-year OS for C and NC patients were 48% and 54% respectively (p=.24), with DFS of 35% and 40% (p=.32), respectively. In conclusion, this multi-centered international study shows that 1) DCBT can be performed effectively on a racially diverse patient population, 2) Survival and other outcome measures were similar between C and NC or between A and NA patients in multivariate analyses, 3) Cell dose remains important for engraftment even with DCBT.ANC500Plt 20K1 Yr Relapse100-Day & 1-Yr TRM1-Yr OS1-Yr DFS% & Median Days to EngraftmentCI 83±7 KM 90±4 21.5 daysCI 57±7 KM 78±7 42days31±721±4 37±650±637±6P-values*C vs. NC (W).34.86.86.87.92.86C vs. NC (NW).06.59.90.35.72.92A vs. NA (W).43.15.80.33.13.66A vs. NA (NW).69.37.75.70.30.30* W = Washed CB, NW = Unwashed, CI = Cumulative Incidence; P-values from multivariate Cox Regression model adjusting for recipient weight, malignancy, and # of StemCyte units involved in DCBT.

Outcomes after Autologous Stem Cell Transplantation for Mantle Cell Lymphoma Based on Remission Status and Induction Chemotherapy Regimen.

Mantle cell lymphoma (MCL) has one of the worst prognoses of any subtype of non-Hodgkin's lymphoma (NHL), with a median survival of 3–4 years in most series. High-dose therapy followed by autologous stem cell transplantation (ASCT) is an increasingly common treatment approach for MCL, and some ASCT studies suggest that less heavily pre-treated patients have a longer duration of progression-free survival (PFS), suggesting that ASCT may lead to more favorable outcomes if used earlier in the course of therapy. We analyzed the outcomes of ASCT with respect to remission status at the time of transplantation and induction regimen used in 56 consecutive transplanted patients with MCL. Twenty-one patients received induction chemotherapy with HyperCVAD with or without rituximab (±R) followed by ASCT in first complete or partial remission (CR1/PR1), 15 received CHOP (±R) followed by ASCT in CR1/PR1, and 20 received ASCT following disease progression. A variety of conditioning regimens were used for ASCT in all 3 groups. Estimates of overall (OS) and progression-free survival (PFS) at 3 years among patients transplanted in CR1/PR1 were 93% and 63%, compared with 46% and 36% for patients transplanted with relapsed or refractory disease, respectively (Figure 1). The hazard of mortality among patients transplanted with relapsed or refractory disease was 6.09 times that of patients transplanted in CR1/PR1 (P=.006). Patients in the CHOP (±R) group appeared to have a higher risk of failure for PFS compared to patients in the HyperCVAD (±R) group, though the difference did not reach statistical significance (hazard ratio [HR] 3.67, P=.11) with the small sample size available. The estimated 3-year PFS was 81% for patients in the HyperCVAD group and 44% for patients in the CHOP group. Patients who received R with induction therapy had a reduced risk of mortality (HR 0.33, P=.05) and failure for PFS (HR 0.28, P=.005) compared to those who did not. In summary, these results suggest that ASCT in first remission leads to improved survival outcomes for patients with MCL compared to ASCT with relapsed or refractory disease, and a HyperCVAD (±R) induction regimen may be associated with an improved PFS among patients transplanted in CR1/PR1. [Display omitted]

NONMYELOABLATIVE TRANSPLATATION IN CHILDREN: Current Status and Future Prospects

Over the last few years a variety of conditioning regimens have been developed that allow allogeneic hematopoietic stem cell engraftment with significantly decreased transplant related-toxicity. While these reduced-intensity regimens have offered hope for patients with malignancies formerly not eligible for myeloablative transplantation due to excessive morbidity (older patients and patients with significant organ toxicity), the role of nonmyeloablative hematopoietic cell transplantation (NM-HCT) in children is unclear. A review of the available literature for pediatric and adult studies shows several malignancies in which approaches designed to limit long-term complications in children may be appropriate. In addition, NM-HCT may offer a safer approach for children with inherited disorders curable by marrow transplantation, such as immunodeficiencies, hemoglobinopathies, or storage diseases. Finally, use of this approach to establish partial donor chimerism may provide an immunologic platform that will allow specific cellular therapies, targeted gene therapy, or immunologic tolerance in solid organ transplantation.