Theseus Pharmaceuticals, Inc. is a biopharmaceutical company focused on discovering, developing, and bringing to market targeted treatments for cancer patients. Their leading investigational compound, THE-630, is a pan-KIT inhibitor undergoing Phase I clinical trials for treating gastrointestinal stromal tumors. The company is also advancing a fourth-generation EGFR inhibitor specifically designed to combat the C797S EGFR mutation, which confers resistance to initial or later-line osimertinib therapy in individuals with non-small cell lung cancer.