Aduro Biotech Data Published in Cell Reports Highlights the Significant Role of the Magnitude of Intratumoral STING Activation by ADU-S100 in Anti-Tumor Immunity

BERKELEY, Calif., Dec. 12, 2018 (GLOBE NEWSWIRE) — Aduro Biotech, Inc. (NASDAQ: ADRO) today announced the publication of a peer-reviewed paper in Cell Reports authored by Aduro scientists and Novartis collaborators as part of their ongoing research to study intratumoral stimulator of interferon genes (STING) pathway activation as a potential therapeutic approach for the treatment of cancer. In this study, researchers determined an intratumoral dosing regimen of STING pathway activator, ADU-S100, optimized for adaptive immunity in mouse models. While high doses of ADU-S100 were effective at clearing injected tumors, researchers found that higher tumor ablative dosing regimens could compromise durable anti-tumor immunity. Lower immunogenic doses of ADU-S100 were shown to optimally elicit CD8+ T cell responses required for systemic and durable anti-tumor immunity, and were also found to be efficacious in combination with checkpoint inhibitor therapy.

“We previously established that intratumoral STING pathway activation by ADU-S100 results in tumor regression in preclinical models. Our publication in Cell Reports now highlights the importance of optimizing the therapeutic dose regimen for STING agonists with the aim to balance innate and adaptive immune responses triggered by STING activation in the tumor microenvironment,” stated Andrea van Elsas, Ph.D. chief scientific officer of Aduro. “Our findings support the use of immunogenic doses of ADU-S100 with checkpoint inhibitors to drive efficacious anti-tumor CD8+ T cell responses. We are encouraged by the potential of ADU-S100 as a novel treatment for cancer as we continue clinical evaluation of our lead compound in combination with checkpoint inhibitors.”

The paper titled “Magnitude of Therapeutic STING Activation Determines CD8+ T-Cell Mediated Anti-Tumor Immunity,” can be accessed online ahead of the print version in the peer-reviewed Journal Cell Reports.

ADU-S100 is the first STING pathway activator compound to enter the clinic and is currently being evaluated in a Phase 1 clinical trial as a single agent and in combination with ipilimumab (see www.clinicaltrials.gov, identifier NCT02675439) and in a Phase 1b combination trial with spartalizumab (PDR001), Novartis’ investigational anti-PD-1 monoclonal antibody (see www.clinicaltrials.gov, identifier NCT03172936).

About STING Pathway Activator Technology
The Aduro-proprietary STING pathway activator product candidates, including ADU-S100 (MIW815), are synthetic small molecule immune modulators that are designed to target and activate human STING. STING is generally expressed at high levels in immune cells, including dendritic cells. Natural activation of STING is not always sufficient to prevent the growth and spread of cancer cells. In preclinical models, ADU-S100 directly activates STING to further amplify the natural anti-tumor response. Once activated, the STING receptor initiates a profound innate immune response through multiple pathways, inducing the expression of a broad profile of cytokines, including interferons and chemokines. This subsequently leads to the development of a systemic tumor antigen-specific T cell adaptive immune response.

Aduro’s lead molecule, ADU-S100, is the first therapeutic in development specifically targeting STING. In collaboration with Novartis, it is being tested in a Phase 1 clinical trial as a single agent and in combination with ipilimumab, and in a Phase 1b combination trial with spartalizumab (PDR001), an investigational anti-PD-1 monoclonal antibody. These studies are enrolling patients with cutaneously accessible, advanced/metastatic solid tumors or lymphomas. The trials are evaluating the ability of ADU-S100 to activate the immune system and recruit specialized immune cells to attack the injected tumor, leading to a broad immune response that seeks out and kills distant metastases.

About Aduro
Aduro Biotech, Inc. is an immunotherapy company focused on the discovery, development and commercialization of therapies that are intended to transform the treatment of challenging diseases. Aduro’s technologies, which are designed to harness the body’s natural immune system, are being investigated in cancer indications, autoimmune diseases and have the potential to expand into infectious diseases. Aduro’s STING pathway activator technology is designed to activate the STING receptor in immune cells, which may result in a potent tumor-specific immune response. ADU-S100 (MIW815) is the first STING pathway activator compound to enter the clinic and is currently being evaluated in a Phase 1 clinical trial as a single agent and in combination with ipilimumab and in a Phase 1b combination trial with spartalizumab (PDR001), an investigational anti-PD-1 monoclonal antibody. Aduro’s B-select monoclonal antibody technology, including BION-1301, an anti-APRIL antibody, is comprised of a number of immune modulating assets in research and development. Aduro is collaborating with leading global pharmaceutical companies to expand its products and technologies. For more information, please visit www.aduro.com.

Cautionary Note on Forward-Looking Statements
This press release contains forward-looking statements for purposes of the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Forward-looking statements include statements regarding our intentions or current expectations concerning, among other things, the potential for ADU-S100 for the treatment of cancer, the timing of clinical data and our ability to advance our drug development programs on our own or with our collaborators. In some cases you can identify these statements by forward-looking words such as “may,” “will,” “continue,” “anticipate,” “intend,” “could,” “project,” “expect” or the negative or plural of these words or similar expressions.  Forward-looking statements are not guarantees of future performance and are subject to risks and uncertainties that could cause actual results and events to differ materially from those anticipated, including, but not limited to, early or preliminary clinical trial results may not be predictive of future results, our history of net operating losses and uncertainty regarding our ability to achieve profitability, our ability to develop and commercialize our product candidates, our ability to use and expand our technologies to build a pipeline of product candidates, our ability to obtain and maintain regulatory approval of our product candidates, our ability to operate in a competitive industry and compete successfully against competitors that have greater resources than we do, our reliance on third parties, and our ability to obtain and adequately protect intellectual property rights for our product candidates.  We discuss many of these risks in greater detail under the heading “Risk Factors” contained in our quarterly report on Form 10-Q for the quarter ended September 30, 2018, which is on file with the Securities and Exchange Commission. Any forward-looking statements that we make in this press release speak only as of the date of this press release. We assume no obligation to update our forward-looking statements whether as a result of new information, future events or otherwise, after the date of this press release.