Corporate Profile

Theseus Pharmaceuticals is passionately committed to improving the lives of cancer patients by working to outsmart cancer resistance. Led by a team of targeted oncology pioneers with a proven track record developing and commercializing cancer therapeutics, the Company is developing next-generation tyrosine kinase inhibitors (TKIs): “pan-variant” targeted therapies that address all major drug resistant mutations. Theseus believes a pan-variant approach is the most effective way to address cancer resistance.

The Company’s lead program, THE-630, is a pan-variant KIT inhibitor for patients with advanced gastrointestinal stromal tumors (GIST), whose cancer has developed resistance to earlier lines of kinase inhibitor therapy. Theseus is also developing THE-349: a fourth-generation, selective epidermal growth factor receptor (EGFR) inhibitor to address C797X-mediated resistance to first- or later-line osimertinib treatment in patients with non-small cell lung cancer (NSCLC). Finally, Theseus is also developing a series of next-generation, pan-variant TKI molecules targeting BCR-ABL mutations for the treatment of refractory chronic myeloid leukemia (CML) and front-line Philadelphia chromosome-positive acute lymphoblastic leukemia (ALL). 

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Recent News Releases from Theseus
Jan 5, 2023

Progressing Phase 1/2 clinical trial of THE-630 in advanced GIST; preliminary dose-escalation data anticipated in Q2 2023 with additional data expected in Q4 2023 IND submission for 4G EGFR...

Nov 3, 2022

All sites open and actively enrolling in Phase 1 portion of Phase 1/2 clinical trial of THE-630 in advanced GIST; preliminary dose escalation data expected in Q2 2023 Preclinical data...

Oct 26, 2022

Potent single-molecule inhibition of all major classes of EGFR activating and resistance mutations, including C797X and T790M, with a high degree of kinome and wild-type EGFR selectivity Deep and...

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