1 Umbilical Cord Blood: An Alternative Allogeneic Stem Cell Source for Transplantation Mary J. Laughlin, MD Associate Professor of Medicine and Pathology Dr. Donald and Ruth Weber Goodman Professor of Innovative Cancer Therapeutics Case Western Reserve University Medical Director Abraham J. & Phyllis Katz Cord Blood Foundation
2 Allogeneic Stem Cell Transplantation in AML Over the past 3 decades allogeneic transplantation has been established as an effective salvage treatment for relapsed and high risk AML. The alloreactive immunotherapeutic effects, termed GVL contribute greatly to its efficacy. No other established therapy exerts as strong an anti-leukemic effect. Unfortunately wide application of allosct is limited by graft availability and is considerably offset in the unrelated setting by complications related to disparity of donorrecipient histocompatibility contributing to Graft vs. Host Disease, which exerts a significant price in mortality and morbidity. As a result, allosct produces only a limited gain in AML survival in the unrelated setting despite significantly reducing relapse.
3 Overview: UCB Transplant Allogeneic transplantation for hematology patients is limited by graft availability. UCB is a new alternative graft source; to date approximately 8000 procedures have been performed worldwide. Application of UCB transplantation has previously been limited by low cell dose, particularly in adult patients.
4 Overview: UCB Transplant Continued Two large retrospective European and American studies reported in 2004 comparing transplant outcomes with URD vs. UCB indicate equivalence in adult leukemia patients. Current studies are focused on UCB graft engineering and immune reconstitution in acute leukemia patients.
5 Clinical Problem Allogeneic Graft Availability Hematology Patients Needing BMT 8/10 No Compatible Family Donor 2/10 Compatible Sibling Donor Only 20-35% Receive BMT via Adult Registry Match
6 UCB Stem Cells Advantages Abundantly available / birthing represents genetic background of any population. Harvested at no risk to mother or infant. Easily shipped frozen to transplant center, quickly available for patients with unstable disease. Lymphocyte immune tolerance of the neonate with low Th1 associated cytokine production. Non-controversial source of post-natal stem cells. No malignant transformation after infusion.
7 UCB Stem Cells Disadvantages One time donation with finite volume. Prolonged kinetics hematopoietic engraftment. Limited graft cell dose in adult recipients.
8 Pioneers in UCB 1988 proof of concept: first related UCB transplant into a 5 year old child with Fanconi anemia. This patient remains alive and disease free. Subsequent contributions to the UCB field included analyses of engraftment, GVHD, GVL and immune reconstitution in pediatric and adult hematology patients. E. Gluckman, MD Hospital Saint Louis, Paris
9 UCB Transplant The acute leukemia working party of the EBMT/Eurocord-Netcord registry compared outcomes in 682 adult leukemia patients for whom 98 received UCB and 584 BM from URD during Multivariate analysis showed UCB yielded lower risks of agvhd and slower neutrophil recovery. The incidence of cgvhd, TRM, relapse and LFS did not differ comparing UCB and URD.
10 LFS after Cord Blood or Bone Marrow Transplant from Unrelated Donors in Adults Rocha et al, N Engl J Med 2004;351:
11 Pioneers in UCB Developed UCB collection and cryopreservation protocols. Established first related UCB registry in collaboration with EBMT and reported results in 44 pediatric hematology patients.* Subsequent contributions included UCB graft analyses as predictors of engraftment / survival and use of dual UCB grafts. *J. Wagner, et al. Lancet. 1995; 346: J. Wagner, MD University of Minnesota
12 Survival after 0-3 mismatched unrelated UCBT & 6/6 HLA-matched BMT in children Proportion Surviving UCBT BMT-MTX p = Months 53% 41% Proportion Surviving BMT-TCD 56% UCBT 52% p > Months Patient analyses with match for age, diagnosis, and disease stage. Barker et al, Blood May 15;97(10):2957 Blood May 15;97(10):
13 Graft Cell Dose is a Critical Determinant of TRM after Single Unit UCBT (n = 102) Probability TRM by CD34+ dose (x 10 5 /kg) Years < > p < % survival at 1 year if unit > 1.7 x 10 5 CD34+/kg. Wagner, et al. Blood Sep 1;100(5):
14 DFS for Acute Leukemia in CR Single vs. Double UCBT CY60/TBI1320 Cumulative Proportion I I I I Double: Adults + Adolescents Single: Children I double single Months I I I I I I
15 Pioneers in UCB Developed the National Cord Blood Program, the first cord blood bank for unrelated recipients. Currently the largest public bank world-wide wide (45,000 units donated with 2,300-plus patients transplanted; including >800 adults). NCBP has developed and maintains the most extensive database on UCB transplantation outcomes world-wide. wide. P. Rubinstein, MD, C. Stevens, MD National Cord Blood Program New York Blood Center
16 UCB ANC recovery by cell dose Rubinstein, N Engl J Med 1998;339:
18 PROBABILITY OF SURVIVAL Impact of Cell dose and HLA mismatch CB matched PROBABILITY CB 1 agmm (>2.5) CB 2 agmm (>2.5) CB 1 agmm (<2.5) CB 2 agmm (<2.5) YEARS
19 Pioneers in UCB Proof of concept: performed first unrelated UCB transplant in Subsequent contributions have included analyses of UCB engraftment, GVHD, survival, and immune reconstitution in pediatric and adult hematology patients. Focused studies of UCB transplantation in children with inherited metabolic diseases; Hurler s syndrome and Krabbe s disease. J. Kurtzberg, MD Duke University
20 Cumulative Incidence of Neutrophil and Platelet Engraftment and EFS in Hurler s Disease after Cord-Blood Transplant Staba, S. L. et al. N Engl J Med 2004;350:
21 Probability of Survival in Krabbe's Disease after UCB Transplant Escolar, M. L. et al. N Engl J Med 2005;352:
22 Clinical Reports: UCB in Adults UCB as a novel stem cell source in pediatric recipients with noted delayed hematologic engraftment and reduced GVHD compared with conventional stem cell grafts. The focus of our initial study was to determine the feasibility of UCB transplant in adults. Outcomes in 68 adults treated consecutively at 5 US centers during the time period 2/95 to 9/99 were analyzed. Laughlin et al. New Engl J Med. 2001; 344:
23 Probability of neutrophil recovery by UCB graft cell dose level Probability of neutrophil recovery cell dose < 1.87*10 7 /kg (n=23) cell dose (1.87, 2.41) (n=21) cell dose > 2.41*10 7 /kg (n=24) p-value = days after transplantation No. at Risk: Laughlin, MJ., et al., N Engl J Med 2001;344:
24 Probability of event free survival by graft CD34 infused cell dose 1.0 probability of Event Free Survival CD34 < 1.2*10 5 /kg (n=30) CD34 > 1.2*10 5 /kg (n=31) p-value = 0.05 (Wilcoxon) days after transplantation No. at Risk: Laughlin, M.J., et al., N Engl J Med 2001;344:
25 UCB Graft Engineering Strategies Cytokine-based UCB expansion. hypotheses: Engraftment? Faster and/or improved survival than non-expanded UCB. Day 0 Day 12 J. Jaroscak Blood E.J. Shpall Biol Blood Marrow Transplant Infusion of dual UCB units. hypotheses: 1.? Graft vs. graft immuno-reactivity. 2. Kinetics of engraftment. J. Barker, et al. Blood 102 (5): 1915, 2003.
26 Pioneers in UCB J. Barker has reported on 23 patients infused with 2 UCB units (median total dose cryopreserved 3.5x10e7/kg) after ablative conditioning in whom all evaluable patients demonstrated sustained donor engraftment. Chimerism revealed emergence of one donor over time. Neither cell dose nor HLA was predictive for engraftment. GVHD incidence paralleled that of historic controls. One year EFS was 57% overall and 72% in patients transplanted in CR. J. Barker, et al. Blood, 2005 J. Barker, MD Memorial Sloan Kettering Cancer Center
27 Start of Formal Search Unrelated Donor Search Time Time 19 BM days (1-257) 30 days (10-101) UCB 13.5 days (2-387) (N = 50) 50 days (32-293) (N = 58) Donor identified Donor available UCB availability significantly faster than BM Barker, Biol Blood Marrow Transplant. 2002;8(5):
28 Cumulative Incidence Sustained Donor Engraftment Cy/Flu/TBI (n = 22) 9.5 days (5-28) 94% (95% CI: ) Days Cy/Flu/TBI is non-myeloablative & engraftment is superior to Bu/Flu/TBI Bu/Flu/TBI (n = 21) 26 days (12-30) 76% (95% CI: 56-96) p < Barker et al, 2003 ;102(5): ;102(5):
29 II Survival Single Double p Survival 42% 46% 0.44 Probability II II II I I I I I I I I Overall Survival: 44% (95%CI: 30-58) II I I Progression-Free Survival: 35% (95%CI: 21-49) I I II I Months Regression of relapsed or persistent disease (n = 16) suggest a GVM effect & better PFS in specific disease groups (e.g. indolent NHL/CLL/mantle cell NHL CR in 12/16) Barker et al: Blood 2004, 104; 235a
30 Pioneers in UCB Dr. Shpall reported in 37 patients (25 adults/12 children) that augmentation of UCB with ex vivo expanded cells resulted in engraftment in all evaluable patients with median 28 days to ANC500. Survival at 30 months was 35%. Shpall E.J. et al. Biol Blood Marrow Transplant (2002); 8 (7): E.J. Shpall, MD MD Anderson Cancer Center
31 Ex Vivo Expansion of Cord Blood University of Colorado Trial Cords in 2 Fractions: Expanded 40%, 60% Fractions CD34 Selection: Isolex 300i Cell Density: ~1x10 6 CD34+cells in 800 ml Growth Factors: SCF, G-CSF, MGDF 100 ng/ml Culture Medium: Amgen defined media Culture Bags: 1L Teflon bags, Am. Fluoroseal Culture Duration: 10 Days Engraftment failure rate low (2/33=6%) Engraftment rates in range of recipients of higher cell doses: neutrophils 35, platelets 300 days Shpall E.J. et al. Biol Blood Marrow Transplant (2002); 8 (7):
32 MDACC Protocol # : Double vs. Expanded Cord IND #7166 (MD Anderson Sponsor) Patients with Hematologic Malignancies Randomize (30 per arm) Primary Endpoints: Time to neutrophil engraftment Engraftment failure Two Unmanipulated Cords One Expanded and One Unmanipulated Cord Immune Reconstitution (Komanduri Laboratory): T and NK subsets TREC assays Functional T Cell Recovery (CFC assays)
33 FACT Dr. Shpall has lead the study group in FACT to establish FACT standards for UCB banking. An initial nine cord blood banks accredited located in New York, North Carolina, Belgium, France, Spain, Germany, United Kingdom, Finland and Italy were the first to earn FACT-NETCORD accreditation. Presently, the FACT-NETCORD Cord Blood Bank Inspection and Accreditation Program has accredited over 40 cord blood banks in 14 countries.
34 UCB Collection/Processing
35 Pioneers in UCB CIBMTR comparison of transplant outcomes after URD vs. UCB in children and adults with leukemia. Analyses UCB graft characteristics and engraftment with large multi-institutional datasets. M. Horowitz, MD CIBMTR University of Wisconsin
36 PROBABILITY OF NEUTROPHIIL RECOVERY, % Bone marrow, matched Bone marrow, mismatched Cord blood, mismatched No. at Risk Bone marrow, matched DAYS Bone marrow, mismatched Cord blood, mismatched
37 IBMTR UCB vs. URD Adult leukemia patients receiving UCB HLA mismatched at one Ag (34 pts), or two Ag (116 pts) were compared with those receiving HLA matched marrow (367 pts) or one Ag mismatched (83 pts). Acute GVHD incidence was higher after URD while cgvhd was higher after UCB. HLA matched URD was associated with lower TRM and higher survival. One HLA Ag mismatched URD outcomes were equivalent to two Ag mismatched UCB.
38 ADJUSTED PROBABILITY OF LEUKEMIA-FREE SURVIVAL, % YEARS Bone marrow, matched Cord blood, mismatched Bone marrow, mismatched No. at Risk Bone marrow, matched Bone marrow, mismatched Cord blood, mismatched
39 Summary Current medical therapy for AML is limited by high recurrence rates. Allogeneic transplantation is curative in 45-55% high risk AML. Application of Allogeneic Transplantation is limited by availability of HLA matched hematopoietic stem cell grafts. UCB has emerged as an alternative source of hematopoietic stem cells for transplantation. UCB graft immune reactivity differs from hematopoietic stem cell grafts from adult donors, allowing successful transplantation despite HLA disparity. Current obstacles to optimal UCB curative potential include engraftment and infection. Future studies are focused on UCB stem cell homing and engraftment and immune reconstitution.
40 Collaborators Case Western Reserve Hillard Lazarus, MD Brenda Cooper, MD William Tse, MD Stanton Gerson, MD Richard Creger, PharmD Omer Koc, MD Magdalena Tary-Lehmann, PhD Nicholas Greco, PhD Beth Kaminski, MD R. Patrick Weitzel Ramasay Sakthivel, PhD Laura Fanning Yu Chung Yang, PhD Laura Keys Howard Meyerson, MD Patrick Leahy, PhD Martina Veigl, PhD Clark Distelhorst, MD Matthew Lesniewski, PhD Jon Goldberg, MD Tomas Kleen, PhD Shyam Bhakta, MD Marcie Finney, MS Suzanne Kadereit, PhD Margaret Kozik Pingfu Fu, PhD Jason Banks Kathy Daum Woods
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