The overall objective of this proposal is to apply an anti-idiotype (Id) based vaccine approach for the treatment of HER2/neu positive human cancer. Amplification and/or overexpression of HER2/neu occurs in multiple human malignancies and is associated with a poor prognosis. A humanized anti-HER2/neu mAb, 4D5 (Herceptin) is therapeutic when administered for a subset of patients with metastatic breast cancer, especially in combination with chemotherapy. These exciting results provide a basis for further development of new antibody-based cancer therapy strategies. One such strategy is active specific immunotherapy in which the host immune system is targeted to HER2/neu expressing tumor cells. We propose to develop """"""""internal image"""""""" anti-Id vaccines that will resemble the three- dimensional shapes of HER2/neu. Immunization with such an anti-Id vaccine will break immune tolerance and induce sustained high titer HER2/neu specific antibodies in patients in a genetically unrestricted fashion. We will target the clinically proven, protective epitopes of HER2/neu as defined by Herceptin and also by mAb 520C9 which recognizes a different epitope. Murine mAb 4D5 (parental antibody for Herceptin) and 520C9 will be used separately as the immunizing antibody or Abi to which anti-Ids or Ab2 will be generated. Ab2 will be used to induce anti-HER2/neu antibodies (Abi') in mice and rabbits. The cross-reactivities of the induced anti-anti-Id (Ab3) antibodies with the native HER-2 receptor will be determined by flow cytometry, immunohistochemistry, and immunoprecipitation with the use of corresponding Abi as positive control. The anti-tumor activity of Ab3 (Abi') will be assessed both in vitro and invivo. We will determine the Ab3 mediated growth inhibitory effects on HER2/neu positive cancer cells in tissue culture and in xenografted nude mice. The cellular and molecular mechanisms of antibody-induced growth inhibition will be investigated. The therapeutic efficacy of the potential anti-Id vaccines will then be tested for tumor protection as well as therapy of established tumors in an immunocompetent murine model of carcinoma cells transduced with the HER2/neu gene. Immunotherapeutic potential of the selected anti-Id vaccines will also be evaluated in HER2/neu transgenic mice. The criteria for selection of optimal anti-Id vaccines will be based on the ability to invoke anti-tumor activities in vitro and invivo. This study will be a prelude to clinical trials for HER2/neu positive cancer patients with a single or combined anti-Id vaccine.

National Institute of Health (NIH)
National Cancer Institute (NCI)
Research Project (R01)
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Special Emphasis Panel (ZRG1-ET-1 (01))
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Hecht, Toby T
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University of Cincinnati
Internal Medicine/Medicine
Schools of Medicine
United States
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Saha, Asim; Chatterjee, Sunil K (2010) Dendritic cells pulsed with an anti-idiotype antibody mimicking Her-2/neu induced protective antitumor immunity in two lines of Her-2/neu transgenic mice. Cell Immunol 263:9-21
Pal, Smarajit; Saha, Asim; Mohanty, Kartik et al. (2007) Generation of Her-2/neu vaccine utilizing idiotypic network cascade. Cancer Biol Ther 6:1916-25
Mohanty, Kartik; Saha, Asim; Pal, Smarajit et al. (2007) Anti-tumor immunity induced by an anti-idiotype antibody mimicking human Her-2/neu. Breast Cancer Res Treat 104:1-11
Saha, Asim; Baral, Rathindra Nath; Chatterjee, Sunil K et al. (2006) CpG oligonucleotides enhance the tumor antigen-specific immune response of an anti-idiotype antibody-based vaccine strategy in CEA transgenic mice. Cancer Immunol Immunother 55:515-27
Baral, Rathindra Nath; Saha, Asim; Chatterjee, Sunil K et al. (2003) Immunostimulatory CpG oligonucleotides enhance the immune response of anti-idiotype vaccine that mimics carcinoembryonic antigen. Cancer Immunol Immunother 52:317-27
Bhattacharya-Chatterjee, Malaya; Chatterjee, Sunil K; Foon, Kenneth A (2002) Anti-idiotype antibody vaccine therapy for cancer. Expert Opin Biol Ther 2:869-81