Clinical trial NCT01094197: Detailed Evaluation of Microchimerism
Official title: Evaluation to Determine Whether Transfusion-associated Microchimerism Involves Engraftment With Hematopoietic Progenitor Cells
Study type: OBSERVATIONAL
Overall status: WITHDRAWN
Conditions: Chimerism
Blood Transfusion
Wounds and Injuries
Hematopoiesis
Keywords: Transfusion-associated microchimerism
Injuries
Leukocytes
Lead sponsor: Vitalant Research Institute
Sponsor class: OTHER
Collaborators: name: National Heart, Lung, and Blood Institute (NHLBI)
First posted: 2010-03-26
Enrollment: 0
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Observational model: CASE_ONLY
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Previous study participants

Brief summary: Individuals who experience traumatic injury often require blood transfusion. In some individuals who receive blood after an injury, white blood cells from a person who donated blood may remain in the body for years, a condition known as microchimerism. This study is designed to examine a group of people who are known to have long-term microchimerism and, through analysis of their blood, determine whether there is evidence that the microchimerism involves blood stem cells that can become any type of blood cell (red blood cells, white blood cells, or platelets) and that might be a permanent part of the body.

Detailed description: Transfusion-associated microchimerism, the persistence of donor white blood cells months or years after transfusion in the recipient, has been observed in approximately 10-15% of transfused trauma patients. Previous studies suggest that the microchimeric cells include multiple immunophenotypes of leukocytes (CD4+, CD8+, CD15+, and CD19+) and that they can persist for decades, features suggestive of hematopoietic engraftment.

In this study, ten subjects known to have long-term microchimerism will undergo either leukapheresis (a blood filtering procedure) or collection of a 500 mL whole blood sample (the amount of a standard blood donation). These samples will then be analyzed to determine whether the microchimeric (donor) cells include hematopoietic stem cells (CD34+) and precursor cells in the red blood cell, white blood cell, and platelet lineages.

Eligibility criteria: Inclusion Criteria:

* Demonstrated long-term microchimerism following transfusion for traumatic injury

Exclusion Criteria:

* Prior bone marrow or solid organ transplantation
* Pregnancy
* Blood transfusion within the past 12 months

Primary outcomes:
Secondary outcomes:
Other outcomes:
Locations:
city: Sacramento
country: United States
facility: University of California, Davis, Medical Center
state: California
Study officials:
affiliation: Vitalant Research Institute
name: Michael P. Busch, MD, PhD
role: PRINCIPAL_INVESTIGATOR
References:
citation: Utter GH, Owings JT, Lee TH, Paglieroni TG, Reed WF, Gosselin RC, Holland PV, Busch MP. Blood transfusion is associated with donor leukocyte microchimerism in trauma patients. J Trauma. 2004 Oct;57(4):702-7; discussion 707-8. doi: 10.1097/01.ta.0000140666.15972.37.
citation: Lee TH, Paglieroni T, Utter GH, Chafets D, Gosselin RC, Reed W, Owings JT, Holland PV, Busch MP. High-level long-term white blood cell microchimerism after transfusion of leukoreduced blood components to patients resuscitated after severe traumatic injury. Transfusion. 2005 Aug;45(8):1280-90. doi: 10.1111/j.1537-2995.2005.00201.x.
citation: Utter GH, Reed WF, Lee TH, Busch MP. Transfusion-associated microchimerism. Vox Sang. 2007 Oct;93(3):188-95. doi: 10.1111/j.1423-0410.2007.00954.x.
citation: Utter GH, Lee TH, Rivers RM, Montalvo L, Wen L, Chafets DM, Reed WF, Busch MP. Microchimerism decades after transfusion among combat-injured US veterans from the Vietnam, Korean, and World War II conflicts. Transfusion. 2008 Aug;48(8):1609-15. doi: 10.1111/j.1537-2995.2008.01758.x. Epub 2008 May 22.