Galena Biopharma, Inc. (Nasdaq: GALE) announced that preclinical data from the Company’s NeuVax (nelipepimut-S) program is being presented today at the Progress in Vaccination Against Cancer (PIVAC) Conference in Winchester, UK. NeuVax contains the immunodominant peptide derived from the extracellular region of the HER2 protein, which is expressed in ovarian and pancreatic cancers as well as in breast cancer.
The poster, entitled, “Preclinical study on the efficacy of NeuVax peptide vaccine against human Her2+/ HLA-A2.1+ ovarian and pancreatic cancer,” demonstrated the results of HLA-A2 transgenic mice that were immunized with NeuVax (E75) mixed with recombinant mouse GM-CSF (NeuVax mice). As control, a group of mice received GM-CSF alone (control mice). CD8+ T cells purified from the spleens of HLA-A2 transgenic immunized mice were adoptively transferred to NSG (NOD/SCID/IL2Rγnull) mice bearing human ovarian or pancreatic tumors which were HER2+, HLA-A2+.
Administration of the NeuVax vaccination resulted in a specific, delayed-type hypersensitivity (DTH) reaction and in the induction of E75 specific CD8+ T cells that express PD-1 (programmed T-cell death protein). Both ovarian and pancreatic tumor growth rate was significantly reduced in NSG mice that received the CD8+ T cells from NeuVax-immunized mice compared to those receiving CD8+ T cells from control mice. Additionally, PD-1 was identified on activated CD8+ T cells.
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