On November 15, 2018 Tolero Pharmaceuticals, Inc., a clinical-stage company focused on developing novel therapeutics for hematological and oncological diseases, reported the presentation of clinical and preclinical data supporting the development of TP-0903 for the treatment of patients with solid tumors (Press release, Tolero Pharmaceuticals, NOV 15, 2018, View Source [SID1234531405]). TP-0903 is an oral, small molecule inhibitor of the AXL receptor tyrosine kinase. Key findings from syngeneic mouse models suggest that TP-0903 has immune activating potential leading to enhanced host immune responses in tumor models.
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The data will be presented at the 2018 EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) Molecular Targets and Cancer Therapeutics Symposium in Dublin. Posters will be on display from 10:00 a.m. to 2:00 p.m. GMT on Nov. 16 in the Exhibition Hall of the Convention Centre Dublin.
"There is a significant need to develop new cancer therapeutic solutions aimed at strengthening the body’s own immune response," said David J. Bearss, Ph.D., Chief Executive Officer of Tolero Pharmaceuticals, Inc. "AXL kinase is an important oncolytic target; we are encouraged by the findings of TP-0903 showing the inhibition of AXL kinase, demonstrating enhanced host immunity. We look forward to further developments of TP-0903 in counteracting AXL-mediated effects."
The data show that TP-0903 treatment alters tumors by suppressing the mesenchymal phenotype of the cancer cells and favoring a tumor microenvironment amenable to an immune response. Preclinical models in immune competent animals show modulation of immune cell populations, including neutrophils, regulatory T-cells, and dendritic cells, in the tumors. Additionally, the predictive power of soluble AXL levels in the serum of cancer patients as a biomarker to select patients likely to benefit from TP-0903 treatment will be presented.
Recent data suggest that AXL kinase is involved in tumor cell proliferation and development of resistance to chemotherapeutics. TP-0903 is an AXL receptor tyrosine kinase inhibitor, which has showed nanomolar activity in biochemical assays. In this preclinical study, the immune modulating capabilities were assessed using immunohistochemical and real-time PCR techniques in syngeneic mouse models of solid tumors.
The associated abstract #413, PB-076, is available on the EORTC-NCI-AACR (Free EORTC-NCI-AACR Whitepaper) meeting program website.
About TP-0903
TP-0903 is an investigational oral, small molecule inhibitor of the AXL receptor tyrosine kinase (RTK), which has demonstrated effectiveness in cell-based and animal models of human cancers. The first-in-human Phase 1/1b study is underway identifying the safety and tolerability profile of TP-0903. In addition, the study is analyzing the pharmacodynamics of TP-0903 by assessing biomarkers in patients’ samples before and after treatment with TP-0903, including markers of immune suppression.
About AXL Kinase
AXL belongs to the TAM (Tyro3, AXL and Mer) family of receptor tyrosine kinases and is overexpressed in many human cancers. It plays a key role in tumor cell proliferation, survival, metastasis, cellular adhesion and avoidance of the immune response. The overexpression of AXL is associated with a poor patient prognosis and drug resistance.1,2