Azacitidine augments expansion of regulatory T cells after allogeneic stem cell transplantation in patients with acute myeloid leukemia (AML).

Abstract:

:Strategies that augment a GVL effect without increasing the risk of GVHD are required to improve the outcome after allogeneic stem cell transplantation (SCT). Azacitidine (AZA) up-regulates the expression of tumor Ags on leukemic blasts in vitro and expands the numbers of immunomodulatory T regulatory cells (Tregs) in animal models. Reasoning that AZA might selectively augment a GVL effect, we studied the immunologic sequelae of AZA administration after allogeneic SCT. Twenty-seven patients who had undergone a reduced intensity allogeneic transplantation for acute myeloid leukemia were treated with monthly courses of AZA, and CD8(+) T-cell responses to candidate tumor Ags and circulating Tregs were measured. AZA after transplantation was well tolerated, and its administration was associated with a low incidence of GVHD. Administration of AZA increased the number of Tregs within the first 3 months after transplantation compared with a control population (P = .0127). AZA administration also induced a cytotoxic CD8(+) T-cell response to several tumor Ags, including melanoma-associated Ag 1, B melanoma antigen 1, and Wilm tumor Ag 1. These data support the further examination of AZA after transplantation as a mechanism of augmenting a GVL effect without a concomitant increase in GVHD.

journal_name

Blood

journal_title

Blood

authors

Goodyear OC,Dennis M,Jilani NY,Loke J,Siddique S,Ryan G,Nunnick J,Khanum R,Raghavan M,Cook M,Snowden JA,Griffiths M,Russell N,Yin J,Crawley C,Cook G,Vyas P,Moss P,Malladi R,Craddock CF

doi

10.1182/blood-2011-09-377044

subject

Has Abstract

pub_date

2012-04-05 00:00:00

pages

3361-9

issue

14

eissn

0006-4971

issn

1528-0020

pii

blood-2011-09-377044

journal_volume

119

pub_type

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