• Follows initiation of Phase 1a/1b study in the U.S.
• Adcentrx intends to include clinical centers in China to broaden geographic representation and accelerate patient enrollment into the Phase 1a/1b study

Adcentrx Therapeutics ("Adcentrx"), a clinical-stage biotechnology company advancing Antibody-Drug Conjugate (ADC) therapies for cancer treatment and other life-threatening diseases, today announced that the China National Medical Products Administration (NMPA) has cleared Adcentrx's Investigational New Drug (IND) application for ADRX-0405. The clearance enables the company to include China-based clinical centers to its ongoing Phase 1a/1b trial (NCT06710379) evaluating ADRX-0405 in patients with late-stage solid tumors, including metastatic castration resistant prostate cancer, gastric cancer, and non-small cell lung cancer.

ADRX-0405 is a potential first-in-class, next-generation ADC targeting six-transmembrane epithelial antigen of the prostate 1 (STEAP1), a cell surface protein that is overexpressed in prostate cancer and certain other cancers, with limited expression in healthy tissue.

China NMPA clears ADRX-0405 IND, enabling Adcentrx to broaden geographic representation in its ongoing Phase 1a/b trial.

"NMPA's clearance of the ADRX-0405 IND is another important milestone for Adcentrx," said Hui Li, Ph.D., Founder and Chief Executive Officer of Adcentrx. "This clearance expands our ability to enroll patients in both the U.S. and China, broadening geographic representation and allowing us to generate clinical data across more diverse patient populations. This enables ADRX-0405 to address important unmet needs across multiple tumor types."

The first-in-human Phase 1a/b clinical trial of ADRX-0405 is an open-label, multicenter dose escalation and dose expansion study. The study is enrolling patients with select advanced solid tumors. The primary objectives of the study are to characterize the safety and tolerability and to determine the optimal dose of ADRX-0405. The company anticipates completing the Phase 1a portion of the trial by the fourth quarter of 2026.