Expression of cancer testis antigen CT45 in classical Hodgkin lymphoma and other B-cell lymphomas.

Abstract

We have shown previously that cancer/testis (CT) antigen, CT45, is expressed in various epithelial cancers at a frequency of <5% to approximately 35%. In this study, the protein expression of CT45 was examined in non-Hodgkin B-cell lymphomas and classical Hodgkin lymphoma by immunohistochemical analysis. Serological response to CT45 was also evaluated by ELISA using CT45 recombinant protein and sera from patients with Hodgkin lymphoma. None of the 80 low-grade B-cell lymphomas, including chronic lymphocytic leukemia/small lymphocytic lymphoma, follicular lymphoma, and mantle cell lymphoma, expressed CT45. In comparison, CT45 was expressed in 28 of 126 (22%) diffuse large B-cell lymphomas (DLBCL). A remarkably high percentage (42/72, 58%) of classical Hodgkin lymphoma contained CT45-positive Reed-Sternberg cells. Nodular sclerosis and mixed-cellularity subtypes had similar frequency of CT45 expression, but most EBV-positive cases were CT45 negative. Gray-zone lymphoma (cases with features of both DLBCL and classical Hodgkin lymphoma) also showed frequent (64%) CT45 expression. Evaluation of reactive lymphoid tissues showed scattered CT45-positive lymphocytes in a single case of florid follicular hyperplasia, raising the possibility that this case was an evolving malignancy. Despite frequent CT45 expression, only 1 of 67 Hodgkin lymphoma patients had detectable anti-CT45 antibodies in the serum, suggesting that the immune response to CT45 may be suppressed. In conclusion, classical Hodgkin lymphoma has the highest frequency of CT45 expression among all malignancies tested to date, the frequency of CT45 expression in DLBCL is similar to that seen in epithelial cancers, and low-grade non-Hodgkin B-cell lymphomas do not express CT45.

• Authors: Yao-Tseng Chen, Amy Chadburn, Peishan Lee, Melinda Hsu, Erika Ritter, April Chiu, Sacha Gnjatic, Michael Pfreundschuh, Daniel M Knowles, Lloyd J Old
• Journal: Proceedings of the National Academy of Sciences of the United States of America (Proc Natl Acad Sci U S A) Vol. 107 Issue 7 Pg. 3093-8 (Feb 16 2010) ISSN: 1091-6490 [Electronic] United States
• PMID: 20133697 (Publication Type: Comparative Study, Journal Article)

Chemical References

• Antigens, Neoplasm
• CT45A1 protein, human

Topics

• Antigens, Neoplasm (immunology, metabolism)
• Enzyme-Linked Immunosorbent Assay
• Hodgkin Disease (metabolism)
• Humans
• Immunohistochemistry
• Immunophenotyping
• In Situ Hybridization
• Lymphoma, B-Cell (metabolism)
• Reed-Sternberg Cells (metabolism)