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Indoleamine 2,3-dioxygenase in tumor tissue indicates prognosis in patients with diffuse large B-cell lymphoma treated with R-CHOP.

Author(s): Ninomiya S, Hara T, Tsurumi H, Hoshi M, Kanemura N, Goto N, Kasahara S, Shimizu M, Ito H, Saito K, Hirose Y, Yamada T, Takahashi T, Seishima M, Takami T, Moriwaki H

Affiliation(s): First Department of Internal Medicine, Gifu University Graduate School of Medicine, and Gifu Municipal Hospital, 1-1 Yanagido, Gifu, 501-1194, Japan.

Publication date & source: 2011-04, Ann Hematol., 90(4):409-16. Epub 2010 Oct 12.

Publication type: Randomized Controlled Trial

Indoleamine 2,3-dioxygenase (IDO) exerts immunomodulatory effects due to enzymatic activities catalyzing the essential amino acid L-tryptophan. IDO activity might play an important role in regulating immune responses exerted by antigen-presenting cells as a potent tool to help escape from assault by the immune system. In this study, we performed immunohistochemical analysis for IDO expression using mouse anti-human IDO monoclonal antibody in 119 tissue samples of diffuse large B-cell lymphoma (DLBCL) obtained before treatment with rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone (R-CHOP). Not only the lymphoma cells themselves but also dendritic cells (DCs) expressed IDO. Positive IDO expression in lymphoma cells was found in 38 cases (32%). Complete remission rates in patients with IDO-positive DLBCL and IDO-negative DLBCL were 55.3% and 79.0% (p=0.008), while 3-year overall survival rates were 49.8% and 78.8%, respectively (p=0.0003). IDO activity might thus play an important role in DLBCL and cells that express IDO appear important for determining outcomes after R-CHOP treatment. IDO might represent a candidate therapeutic target for DLBCL patients who show resistance to chemotherapy.

Page last updated: 2011-12-09

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