HAYWARD - Arcus Biosciences, Inc. (NYSE: RCUS), an oncology-focused biopharmaceutical company working to create best-in-class cancer therapies, today announced financial results for the third quarter ended September 30, 2020 and provided corporate updates.

'Our progress in 2020 has significantly de-risked the viability of Arcus's ambitions to become a long-term independent biopharmaceutical company,' said Terry Rosen, Ph.D., CEO. 'With the continued advancement of our four clinical-stage molecules, a landmark all-in collaboration with Gilead, a recently announced collaboration with AstraZeneca and approximately $785 million of cash on our balance sheet, we are well positioned to capitalize on the opportunities afforded by our pipeline. We expect 2021 to be a pivotal year for the company, with meaningful clinical readouts for all four of our clinical-stage molecules that should provide clear evidence of clinical benefit, as well as the start of a registrational trial that is designed to support the potential approval of both zimberelimab monotherapy and domvanalimab in combination with zimberelimab. In 2021, we also expect to further expand our clinical pipeline with IND filings in the second half of the year for our first two small molecules active against cancer cell-intrinsic targets.'

Key Corporate Highlights

Commenced our 10-year partnership with Gilead to co-develop and co-commercialize next-generation cancer immunotherapies. The partnership was designed to allow Arcus to benefit from Gilead's significant operational and financial resources while preserving Arcus's ability to quickly generate and advance molecules into and through early clinical development. Since the partnership was announced, there has been tremendous collaboration between the two companies, particularly on the domvanalimab clinical program including in the recent execution of our collaboration with AstraZeneca. As part of the agreement, Gilead received immediate rights to co-develop and co-commercialize zimberelimab and an option to exclusively license investigational products from each of Arcus's other current and future programs over the 10-year collaboration term. For each program, Arcus's achievement of a designated development milestone will trigger an option window, and Gilead may exercise its option at any time up until the end of the option window, subject to certain exceptions.

Announced strategic collaboration with AstraZeneca to conduct PACIFIC-8, a registrational study, to evaluate domvanalimab, Arcus's novel anti-TIGIT antibody, in combination with Imfinzi (durvalumab) in Stage III unresectable non-small cell lung cancer (NSCLC). Imfinzi is the only immunotherapy approved for this indication and this trial will evaluate a promising immunotherapy combination that has the potential to further enhance the efficacy and improvement of long-term survival that Imfinzi has already demonstrated in this setting. The study is expected to begin in 2021.

Presented safety data and preliminary evidence of clinical activity from ARC-4, a Phase 1/1b study of etrumadenant plus carboplatin, pemetrexed and anti-PD-1 therapy in patients with metastatic non-small cell lung cancer, at the European Society for Medical Oncology (ESMO) Virtual Congress 2020 in September: Demonstrated a favorable safety profile with early observations of clinical activity seen across multiple clinical settings, including responses in patients with prior immune checkpoint therapy and patients with EGFRmut tumors with recurrent disease.

Dosing continues in EGFRmuttyrosine kinase inhibitor (TKI)-relapsed and refractory patients, a setting which could provide a potential path for accelerated approval. A control arm of zimberelimab and chemotherapy has also been initiated.

Preparations underway for a registrational trial to support the potential approval of both zimberelimab monotherapy and domvanalimab in combination with zimberelimab in a single trial.

Appointed Jennifer Jarrett as Chief Operating Officer (COO) of the company. Ms. Jarrett previously served as Arcus's CFO/COO and was instrumental in the Company's early success, including having led the company's IPO, and has maintained a close connection to Arcus's strategy and operations during the intervening period as an ongoing board member.

About Arcus Biosciences

Arcus Biosciences is an oncology-focused biopharmaceutical company leveraging its deep cross-disciplinary expertise to create highly differentiated therapies and to develop a broad portfolio of novel combinations addressing significant unmet needs. Arcus currently has four molecules in clinical development: Etrumadenant (AB928), the first and only dual A2a/A2b adenosine receptor antagonist in the clinic, is being evaluated in multiple Phase 1b/2 studies across different indications, including prostate, colorectal, non-small cell lung, pancreatic and triple-negative breast cancers. AB680, the first small-molecule CD73 inhibitor in the clinic, is in Phase 1 development for first-line treatment of metastatic pancreatic cancer in combination with zimberelimab and gemcitabine/nab-paclitaxel. Domvanalimab (AB154), an anti-TIGIT monoclonal antibody and new potential immuno-oncology backbone therapy, is in a three-arm randomized Phase 2 study for first-line treatment of PD-L1-high metastatic non-small cell lung cancer evaluating zimberelimab monotherapy, domvanalimab with zimberelimab and domvanalimab plus AB928 with zimberelimab. Zimberelimab (AB122), Arcus's anti-PD-1 monoclonal antibody, is also being evaluated in a Phase 1b study as monotherapy for cancers with no approved anti-PD-1 treatment options, and in various combinations across the portfolio.

Forward-Looking Statements

This press release contains forward-looking statements. All statements other than statements of historical facts contained herein, including, but not limited to, Arcus's expectations for 2021 as set forth in Dr. Rosen's quote, anticipated milestones and expectations with respect to future events under the caption 'Anticipated Corporate Milestones,' and Arcus's expectation that cash, cash equivalents and marketable securities on-hand to be sufficient to fund operations into at least 2023 are forward-looking statements reflecting the current beliefs and expectations of management made pursuant to the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. All forward-looking statements involve known and unknown risks, uncertainties and other important factors that may cause Arcus's actual results, performance or achievements to differ significantly from those expressed or implied. Factors that could cause or contribute to such differences include, but are not limited to: the inherent uncertainty associated with the COVID-19 pandemic, including the duration and/or severity of the outbreak and actions by government authorities to contain or slow the spread of the virus; our dependence on our collaboration with Gilead for the successful development and commercialization of our investigational products; the inherent uncertainty associated with pharmaceutical product development and clinical trials; delays in our clinical trials due to difficulties or delays in the regulatory process, enrolling subjects or manufacturing or supplying product for such clinical trials; the emergence of adverse events or other undesirable side effects; risks associated with preliminary and interim data and changes in the competitive landscape for our programs. Risks and uncertainties facing Arcus are described more fully in Arcus's quarterly report on Form 10-Q for the quarter ended September 30, 2020 filed on November 5, 2020 with the SEC. You are cautioned not to place undue reliance on the forward-looking statements, which speak only as of the date of this press release. Arcus disclaims any obligation or undertaking to update, supplement or revise any forward-looking statements contained in this press release.

Contact:

Katherine Bock

Tel: (510) 694-6231

Email: kbock@arcusbio.com

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