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Blood, 1 August 2006, Vol. 108, No. 3, pp. 804-811.
Prepublished online as a Blood First Edition Paper on April 6, 2006; DOI 10.1182/blood-2006-02-002774.


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Submitted February 14, 2006
Accepted March 16, 2006

Regulatory T cells in cancer

Marc Beyer and Joachim L Schultze*

Molecular Tumor Biology and Tumor Immunology, Clinic I for Internal Medicine, University of Cologne

* Corresponding author; email: joachim.schultze{at}uk-koeln.de.

There is increasing evidence for the existence of elevated numbers of regulatory T cells in solid tumors and hematological malignancies. While the biology of CD4+CD25+FOXP3+ regulatory T cells (Treg) in murine models seems to be rather straight-forward, studies in human diseases are more difficult to interpret due to expression of CD25 on activated effector T cells as well as Treg cells. More important, early studies in human tumors were mainly focused on CD4+CD25+ Treg cells lacking interrogation of more specific markers such as FOXP3 expression. While the increase of Treg cells seems to be a characteristic feature in most tumors, little is known about the molecular and cellular mechanisms responsible for the increase and maintenance of elevated levels of Treg cells in cancer. We will discuss earlier data in context of recent findings in Treg cell biology with a particular emphasis on CD4+CD25highFOXP3+ Treg cells in human malignancies.


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