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PX-866 is an oral, irreversible, pan-isoform small molecule inhibitor of phosphatidylinositol 3-kinase (PI3K), a key enzyme in the PI3K/AKT/mTOR signaling pathway that regulates cell proliferation, survival, adhesion, and motility. Docetaxel is a chemotherapy agent that acts as a microtubule inhibitor disrupting mitosis. The combination of PX-866 with docetaxel has been investigated primarily for treatment of advanced solid tumors including head and neck squamous cell carcinoma (HNSCC) and other refractory cancers. Clinical studies have shown the combination to be generally well tolerated without overlapping toxicities; however, phase 2 trials did not demonstrate significant improvement in progression-free survival or overall survival compared to docetaxel alone in unselected patient populations. The rationale for combining these drugs is based on preclinical synergy between PI3K inhibition by PX-866 and cytotoxic effects of docetaxel.
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