BOSTON, MA--(Marketwired - September 26, 2016) - Pieris Pharmaceuticals, Inc. (NASDAQ: PIRS), a biotechnology company advancing novel biotherapeutics through its proprietary Anticalin® technology platform, announced that it has today presented new preclinical data demonstrating in vivo efficacy of its lead 4-1BB (CD137)-based bispecific cancer immunotherapeutic drug candidate, PRS-343, at the 2016 CRI-CIMT-AACR International Cancer Immunotherapy Conference - Translating Science into Survival, taking place in New York City.
The in vivo data show that treatment of HER2-positive tumor-bearing animals with PRS-343 provided dose-dependent, dual anti-tumor activity by increasing the frequency of tumor-infiltrating lymphocytes via bispecific targeting of 4-1BB and HER2, as well as mediating tumor growth inhibition by direct antagonism of HER2 on tumor cells. In contrast, an agonistic anti-4-1BB benchmark monoclonal antibody (mAb) displayed neither tumor growth inhibition nor enhanced lymphocyte infiltration into tumors compared to an isotype control mAb, but preferentially activated T cells systemically, resulting in significant toxicity. A copy of the poster can be viewed and downloaded by clicking http://www.pieris.com/pirs-cri-poster-2016.
Louis Matis, M.D., Pieris SVP and Chief Development Officer, commented, "These new data support a differentiated mode of action for PRS-343 and demonstrate the potential benefits of tumor microenvironment-localized costimulatory T cell activation for both reduced systemic toxicity and higher efficacy in comparison to conventional agonistic anti-4-1BB mAbs. We look forward to the initiation of our phase 1 clinical trial of PRS-343 for the treatment of cancer patients planned for the first half of 2017."
PRS-343 is a bispecific monoclonal antibody/Anticalin fusion protein comprised of a HER2 tumor-targeting mAb genetically linked to a potent anticalin specific for the immune costimulatory TNF family receptor 4-1BB (CD137). PRS-343 is being developed as the first 4-1BB based therapeutic to mediate the activation of tumor-specific T lymphocytes selectively within the tumor microenvironment (TME). 4-1BB is a potent costimulatory immunoreceptor and an established marker for tumor-specific infiltrating T lymphocytes (TILs), and is therefore, an attractive target for cancer immunotherapy. In in vivo preclinical tumor models, PRS-343 has demonstrated potent T lymphocyte activation localized to the TME of established HER2-positive tumors, indicating the potential for both enhanced safety and efficacy.
About Pieris Pharmaceuticals: Pieris is a clinical-stage biotechnology company that discovers and develops Anticalin® protein-based drugs to target validated disease pathways in a unique and transformative way. Our pipeline includes immuno-oncology multi-specifics tailored for the tumor microenvironment, an inhaled Anticalin to treat uncontrolled asthma and a half-life-optimized Anticalin to treat anemia. Proprietary to Pieris, Anticalins are a novel class of protein therapeutics validated in the clinic and by partnerships with leading pharmaceutical companies. Anticalin®, Anticalins® are registered trademarks of Pieris. For more information visit www.pieris.com.
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