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Granulocyte colony-stimulating factor affects serum levels of soluble interleukin-2 receptors after allogeneic stem cell transplantation.

Soluble interleukin-2 receptor (sIL-2R) levels were analyzed in 127 stem-cell transplant recipients. Granulocyte-colony stimulating factor (G-CSF) was given to 57 patients after transplantation. We found an association between G-CSF and increased sIL-2R levels. This indicates increased T-cell activation and may be one reason for the previously found increased incidence of acute graft-versus-host disease in G-CSF-treated patients.