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Details of HER-2/neu Class I Antigen Licensed by TapImmune published in Journal of Immunology: Antigen is a naturally processed epitope for breast cancer vaccines.
Date:1/22/2013

SEATTLE, Jan. 22, 2013 /PRNewswire/ -- TapImmune Inc. (OTCBB: TPIV) is pleased to announce the January publication of a paper titled "Enzymatic Discovery of a HER-2/neu Epitope That Generates Cross-Reactive T-cells", authored by Henle et al, J.Immunol. (2013), 190, 479-488.  This work, performed in the laboratory of Dr Keith Knutson at Mayo Clinic, describes the discovery of a novel HER-2/neu Class I epitope (p373-382) TapImmune has licensed from Mayo Clinic for the development of breast cancer vaccines.  The significance of this work is that this newly discovered antigen is a naturally occurring antigen processed by the proteasome and elicits peptide-specific T-cell responses.  This results in stronger binding to HLA-A2 and more efficient killing of HER-2/neu positive breast cancer cells by activated T-cells compared to the Class I epitope, p369-377 (E75) which was not naturally processed by the proteasome.

"These results provide an explanation of the molecular immunology behind our approach to HER-2/neu immunotherapy," said Mark Reddish Vice President of TapImmune Inc.  "These data describe how the HER-2/neu protein is processed by the proteasome to then be presented for immune recognition and killing.  By revealing the true identity of the immunodominant epitope responsible for class I mediated killing of HER-2/neu positive tumors, it is now possible to generate a true second generation vaccine that incorporates the correct target as it naturally appears on human tumors.  For nearly 20 years the immunology of this key protein has been clouded by contradictory observations, and these data finally provide an understanding of the 'natural target' displayed on human tumors. We expect to combine this immunodominant peptide with our broadly reactive helper peptides that are currently being tested in a phase I trial, to create a tru
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SOURCE TapImmune Inc.
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