1. Academic Validation
  2. Discovery of ORIC-533, an Orally Bioavailable CD73 Inhibitor That Maintains Activity in High AMP Environments to Reverse Tumor Immunosuppression

Discovery of ORIC-533, an Orally Bioavailable CD73 Inhibitor That Maintains Activity in High AMP Environments to Reverse Tumor Immunosuppression

  • J Med Chem. 2025 Nov 13;68(21):22145-22169. doi: 10.1021/acs.jmedchem.5c02153.
Jared T Moore 1 Hiroyuki Kawai 1 Brian R Blank 1 Kejia Wu 1 Chien-Hung Yeh 1 Liusheng Zhu 1 Johnny D Pham 1 Yosup Rew 1 John Eksterowicz 1 Sumeet Salaniwal 1 Dena Sutimantanapi 1 Robert Warne 1 Natalie Yuen 1 Todd C Metzger 1 Brenda Chan 1 Tom Huang 1 Xi Chen 1 Yuping Chen 1 Frank Duong 1 Wayne Kong 1 Jae H Chang 1 Jessica D Sun 1 Tatiana Zavorotinskaya 1 Quiping Ye 1 Mohammad A Al-Sayah 1 Erica Jackson 1 Melissa R Junttila 1 Valeria R Fantin 1 Chudi O Ndubaku 1 Daqing Sun 1 Xiaohui Du 1 Lori S Friedman 1
Affiliations

Affiliation

  • 1 ORIC Pharmaceuticals, Inc., 240 East Grand Avenue, Fl2, South San Francisco, California 94080, United States.
Abstract

Immunosuppressive adenosine (ADO) is catabolized from adenosine monophosphate (AMP) by CD73 in the tumor microenvironment and corresponds to poor patient prognosis in many cancers. Reducing levels of ADO via inhibition of CD73 may reverse this immunosuppression. Herein we describe the discovery of ORIC-533 (6), an inhibitor of CD73 with subnanomolar biochemical potency and potent cellular activity in both human and mouse tumor cell lines. Compound 6 rescues T-cell activation and cytokine production at low nanomolar concentrations, showing robust immunomodulatory activity. Notably, in high AMP environments compound 6 also promotes CD8+ T-cell proliferation. Oral dosing of 6 reduces the concentration of ADO in the tumor microenvironment with a concomitant increase in CD8+ cells, resulting in tumor growth inhibition in a syngeneic mouse model of Cancer. The strong potency and oral bioavailability support a potential best-in-class profile for 6, a CD73 Inhibitor that entered phase 1b in patients with multiple myeloma.

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Products
  • Cat. No.
    Product Name
    Description
    Target
    Research Area
  • HY-160696
    CD73 Inhibitor