On Oct. 22, 2026, Gilead Sciences announced that it has entered into a definitive agreement to acquire an oral IL-23R inhibitor program, including lead asset HCXT-2001, from PepStar Therapeutics, a privately held, clinical-stage biotechnology company located in Hong Kong.

Key Highlights

• HCXT-2001 is an investigational, clinical-stage, oral, macrocyclic peptide inhibitor of IL-23R with an extended half-life, offering a potentially differentiated approach to oral IL-23 pathway inhibition. IL-23R is a clinically validated target in immune-mediated inflammatory diseases, including Inflammatory Bowel Diseases (IBD), with potential applications in psoriasis.
• The transaction provides Gilead with worldwide rights to the IL-23R inhibitor program, including HCXT-2001, and further strengthens Gilead’s growing inflammation and immunology portfolio, where the company is building depth and optionality in selected immune-mediated diseases through multiple complementary mechanisms and modalities.

Under the terms of the agreement, Gilead will acquire an oral IL-23R inhibitor program, including lead asset HCXT-2001, from PepStar for $1.275 billion in upfront cash consideration, subject to customary adjustments, which is payable at closing. Closing of the transaction is subject to certain customary conditions. The transaction is expected to close in the fourth quarter of 2026.