Resolving conflicting data on expression of the Tn antigen and implications for clinical trials with cancer vaccines.

Abstract:

:The tumor-associated Tn antigen has been investigated extensively as a biomarker and therapeutic target. Cancer vaccines containing the Tn antigen as a single tumor antigen or as a component of a polyvalent vaccine have progressed into phase I and II clinical trials. One major focus of Tn-based vaccines is the treatment of prostate cancer patients. Although expression of the antigen on prostate tumors is a critical prerequisite, previous reports investigating Tn expression in prostate tumors have produced conflicting results. Using a combination of immunohistochemistry and carbohydrate microarray profiling, we show that only 4% to 26% of prostate tumors express the Tn antigen. Based on our results, the majority of prostate cancer patients do not express the appropriate antigen. Therefore, efforts to preselect the subset of prostate cancer patients with Tn-positive tumors or apply Tn vaccines to other cancers with higher rates of antigen expression could significantly improve clinical response rates. Because conflicting information on carbohydrate expression is a general problem for the field, the approach described in this article of analyzing antigen expression with multiple antibodies and using carbohydrate microarray profiles to interpret the results will be useful for the development of other carbohydrate-based cancer vaccines and diagnostics.

journal_name

Mol Cancer Ther

authors

Li Q,Anver MR,Butcher DO,Gildersleeve JC

doi

10.1158/1535-7163.MCT-08-0934

subject

Has Abstract

pub_date

2009-04-01 00:00:00

pages

971-9

issue

4

eissn

1535-7163

issn

1538-8514

pii

8/4/971

journal_volume

8

pub_type

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