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Clinical Trial Summary

This study is designed to determine whether Umbilical Cord Transplantation (UCB) can be substituted for adult bone marrow cells in the standard stem cell transplant regimens used at this hospital for subjects who do not have stem cell donors.


Clinical Trial Description

Allogeneic stem cell transplantation (SCT) following myeloablative and non-myeloablative conditioning therapy has proven curative treatment for a number of inherited and acquired hematologic disorders. The success of allogeneic transplantation is largely determined by compatibility between donor and recipient, which predicts the risk of fatal graft-versus-host disease (GVHD). Unfortunately, less than one third of patients needing an allogeneic transplant have an available compatible donor in their family. Registries have been established to match patients with compatible volunteer (unrelated) donors, but many patients, and in particular minority patients, still lack stem cell donors.

Umbilical cord blood (UCB) is a rich source of hematopoietic stem cells, which is readily available from the placenta following childbirth. Blood banks have been established in the United States and abroad to collect, process and store UCB for use in allogeneic transplantation. To date, more than 2000 UCB transplants have been performed in adults and children around the world.

Rationale for use of Umbilical Cord Blood in Transplantation

UCB has a number of proven and theoretical advantages as an alternative source of hematopoietic stem cells for transplantation:

1. Placental or umbilical cord blood is an abundantly available source of stem cells, which is currently discarded and can be harvested at no risk to the mother or infant.

2. Important infectious agents, particularly CMV, are much less common in the newborn than adults, and are less likely to contaminate UCB collections.

3. UCB collections, typed, cryopreserved and banked, are available on demand, eliminating delays and uncertainties that now complicate marrow collection from unrelated donors. At present, UCB can be delivered for infusion within days of the initiation of a search. This compares with a median of 3 months from search to delivery of stem cells through the registries of volunteer adult donors.

4. The intensity of graft-versus-host reactivity of fetal lymphocytes appears to be less than that of adult cells and consequently fetal lymphocytes are more tolerant of HLA incompatibility. Published studies have shown that transplantation of UCB matched at 4-5/6 antigens results in a comparable incidence of GVHD to transplantation of unrelated stem cells fully matched at 6/6 antigens.

5. Frozen UCB can be easily shipped, stored at the treating institution, and thawed for use when needed, compared to freshly donated stem cells which have a limited shelf-life of one day or less, necessitating coordination between harvesting surgeons, transportation, and transplantation teams.

This research study has been designed for people who have been diagnosed with a blood tumor, which has not responded to treatment or has recurred, a bone marrow failure state such as aplastic anemia, or one of certain inherited metabolic disorders; and whose doctor feels the best treatment is an allogeneic stem cell transplant (alloSCT) but a related or unrelated adult donor is not available. Instead, a single unit of umbilical cord blood (UCB) will be used as the source of the subject's immune system. This study is designed to determine whether a single unit of UCB can be substituted for adult bone marrow cells in the standard stem cell transplant regimens used at this hospital for subjects who do not have stem cell donors. ;


Study Design

Allocation: Non-Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment


Related Conditions & MeSH terms


NCT number NCT00676806
Study type Interventional
Source Tufts Medical Center
Contact
Status Completed
Phase Phase 2
Start date July 2005
Completion date July 2014

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