Theseus Pharmaceuticals Incorporated is a biopharmaceutical company that develops cancer treatments. Its lead product candidate is THE-630, a pan-KIT inhibitor for the treatment of gastrointestinal stromal tumors, which is in Phase I clinical trial. The company's development programs address drug resistance mutations in key driver oncogenes, which are mutated genes that cause cancer. Theseus Pharmaceuticals was incorporated in 2017 and is headquartered in Cambridge, MA.