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The liposomal Hsp90 inhibitor is a preclinical-stage therapeutic candidate being developed by ZoneOne Pharma for the treatment of cancer. The drug consists of a small molecule inhibitor of Heat Shock Protein 90 (Hsp90) encapsulated within a proprietary liposomal delivery system. Hsp90 is a molecular chaperone essential for the folding, stability, and function of numerous 'client' proteins, many of which are oncogenic drivers such as kinases and transcription factors. By inhibiting Hsp90, the drug triggers the degradation of these proteins via the ubiquitin-proteasome pathway, disrupting multiple signaling pathways necessary for tumor cell survival and proliferation. The liposomal formulation is designed to enhance the drug's delivery to tumor tissues through the enhanced permeability and retention (EPR) effect while minimizing systemic toxicities and improving the solubility of the Hsp90 inhibitor payload. The development of this candidate has been supported by a contract from the National Cancer Institute (NCI).
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