Together, these data suggest that patients with plasma Trx-1 levels above the normal upper limit of 18 ng/mL may be more likely to benefit from treatment with PX-12. Thus, Trx-1 levels could be used to select the most appropriate patients for future clinical trials of PX-12.
PX-866 is a small molecule inhibitor of phosphotidylinositol-3 kinase (PI-3K), a key point of control of cellular responses including signaling of cell survival and growth, migration and metabolism. The PI-3K pathway is a key contributing factor to a number of human cancers, particularly ovarian, head and neck, urinary tract, cervical, prostate, endometrial and small cell lung cancers and gliomas. PX-866 presentations at the conference were:
Abstract # 3731: This poster described the use of magnetic resonance spectroscopy (MRS) as a non-invasive method for assessing molecular responses to PX-866 in a glioma tumor model. Results show that PX-866 treatment results in metabolic changes that are consistent with a partial normalization of cellular metabolism and that these changes can be detected by MRS. Tumor volume decreased approximately 75 percent in tumors treated with PX-866 compared with controls. Together, the data demonstrate that PX-866 has multiple anti-cancer activities in glioma cells and suggest that MRS may have utility in assessing early molecular responses to PX-866.
Abstract # 2761: This poster discussed the identification of targets that appear to sensitize glioma cells to the cytotoxic effects of PX-866 using siRNA screening. Results suggest that PX-866 in combination with inhibition of RACK-1 and/or galectin-1 could improve the treatment of gliomas.
Abstract # 5408: This poster described the impact of PX-866 on a
putative cancer stem cell population in models of lung cancer. Treatment of
these cells with PX-866 blocked their proliferation and inhibited tumor
growth, demonstrating not only the critical role of PI-3K in this cellular
|SOURCE Oncothyreon Inc.|
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