On November 7, 2023 Arcus Biosciences, Inc. (NYSE:RCUS), a clinical-stage, global biopharmaceutical company focused on developing differentiated molecules and combination therapies for people with cancer, reported financial results for the third quarter ended September 30, 2023, and provided a pipeline update on its clinical-stage investigational molecules – targeting TIGIT, the adenosine axis (CD73 and A2a/A2b receptors), HIF-2a and PD-1 – across multiple common cancers (Press release, Arcus Biosciences, NOV 7, 2023, View Source [SID1234637117]).

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"As we continue to execute on our Phase 3 trials for domvanalimab in lung and GI cancers, we have one of three important near-term data readouts now behind us. Today’s presentation of data from our Phase 2 EDGE-Gastric study provided important evidence to support domvanalimab’s potential as a differentiated and first-to-market anti-TIGIT antibody for the treatment of first-line upper GI adenocarcinomas. We are also looking forward to sharing more on our HIF-2a inhibitor, AB521, which continues to show a potentially improved clinical profile, with PK/PD results in patients consistent with those seen in healthy volunteers," said Terry Rosen, Ph.D., chief executive officer of Arcus. "Lastly, we will be presenting mature OS data from our Phase 1/1b study of quemliclustat in pancreatic cancer early next year; we are excited to share next steps in the coming months."

Pipeline Highlights:

Domvanalimab (Fc-silent anti-TIGIT monoclonal antibody)
•Preliminary data from Arm A1 of the Phase 2 EDGE-Gastric study, evaluating domvanalimab plus zimberelimab and chemotherapy in patients with previously untreated, locally advanced unresectable or metastatic upper gastrointestinal (GI) cancers, were presented during the Annual Meeting of the American Society of Clinical Oncology (ASCO) (Free ASCO Whitepaper) Plenary Series on November 7, 2023. These data were from the cohort that includes a patient population and dosing regimen similar to the ongoing Phase 3 study, STAR-221.
◦Domvanalimab plus zimberelimab and chemotherapy showed encouraging objective response rates (ORR) of 80% (confirmed ORR (cORR) of 73%) in patients with PD-L1-high tumors (TAP ≥5%), 46% (all confirmed) in patients with PD-L1-low tumors (TAP <5%) and 59% (cORR of 56%) for patients overall.
◦Six-month landmark progression-free survival (PFS) was 93% for patients with PD-L1-high tumors (TAP ≥5%), 68% for patients with PD-L1-low tumors (TAP <5%) and 77% for patients overall.
◦Mature PFS has not been reached and data are expected in the second half of 2024.
◦Domvanalimab plus zimberelimab and chemotherapy was well tolerated, with a similar safety profile to what has been reported for anti-PD-1 plus chemotherapy in this setting.

◦Domvanalimab is the only Fc-silent anti-TIGIT antibody in Phase 3 for gastric, gastroesophageal junction and esophageal adenocarcinoma and has the potential to be first to market for these cancers. These tumor types represent a potential drug-treatable population of over 25,000 in the US and over 100,000 in G-7 countries.
AB521 (HIF-2a inhibitor)

•Pharmacokinetic (PK) and pharmacodynamic (PD) data from the dose-escalation phase of ARC-20, a Phase 1/1b study of AB521 in cancer patients, are consistent with the results seen in healthy volunteers to date.
◦No dose-limiting toxicities have been observed to date in ARC-20.
◦Detailed PK, PD and safety data along with preliminary anti-tumor activity from this stage of ARC-20 will be shared in early 2024.
•Enrollment for the dose-expansion stage of ARC-20 in clear cell renal cell carcinoma (ccRCC) patients is near completion. Efficacy data from this stage of the ARC-20 study are expected later in 2024. The dose-expansion stage will include 30 patients on a 100-mg daily dose, which Arcus believes has the potential to achieve substantially greaterHIF-2a inhibition than the approved dose of the marketed competitor.
•A Phase 2 study evaluating AB521 in combination with a tyrosine kinase inhibitor (TKI) is anticipated to begin in the fourth quarter of 2023.
Quemliclustat (small-molecule CD73 inhibitor)
•Arcus conducted an analysis of mature OS data (minimum follow-up of 18 months) from the ongoing Phase 1/1b ARC-8 trial evaluating quemliclustat plus chemotherapy with or without zimberelimab in first-line pancreatic cancer.
◦At this analysis, 122 patients in the study had received the go-forward dose of 100 mg of quemliclustat; median follow-up time was 21 months.
◦These data will be presented in early 2024.
Etrumadenant (A2a/A2b adenosine receptor antagonist)
•Data from ARC-9, a Phase 1b/2 study evaluating etrumadenant plus zimberelimab plus chemotherapy in second-line and third-line metastatic colorectal cancer (mCRC), which is fully enrolled, are expected in the first half of 2024.
Early Clinical and Preclinical Programs
•ARC-25, a Phase 1 trial in cancer patients for AB598, an anti-CD39 antibody, is currently enrolling.
•Arcus initiated a Phase 1 study in healthy volunteers of AB801, its potent and highly selective AXL inhibitor, and expects to initiate a Phase 1 study in advanced cancer patients in the first quarter of 2024.
•Arcus expects to select a new development candidate against KIT, a target involved in multiple allergic and immune-mediated diseases, by year end.
Financial Results for Third Quarter 2023:
•Cash, Cash Equivalents and Marketable Securities were $950 million as of September 30, 2023, compared to $1.1 billion as of December 31, 2022. The decrease during the period is primarily due to the use of cash in research and development activities, partially offset by receipts of $35 million in upfront payments from Gilead to initiate Arcus-led discovery and early development activities on two jointly selected inflammation targets and $25 million in proceeds from the issuance of 1.2 million shares of our common stock. Arcus now expects cash utilization between $265 million and $290 million for the year ended December 31, 2023. Arcus continues to expect cash, cash equivalents and marketable securities on-hand to be sufficient to fund operations into 2026.
•Revenues were $32 million for the third quarter 2023, compared to $33 million for the same period in 2022. In the third quarter 2023, Arcus recognized $22 million in license and development service revenues related to the advancement of programs, primarily the Gilead collaboration, as well as $10 million in other collaboration revenue primarily related to Gilead’s ongoing rights to access Arcus’s research and development pipeline in accordance with the Gilead collaboration agreement. Revenues were $86 million for the nine months ended September 30, 2023, compared to $78 million for the same period in 2022.
•Research and Development (R&D) Expenses were $82 million for the third quarter 2023, compared to $77 million for the same period in 2022. The net increase of $5 million was primarily driven by: $7 million of higher spend for Arcus programs not under a cost-sharing collaboration due to our expanding clinical and development activities; partially offset by a net decrease of $2 million in shared costs for programs optioned by our collaboration partners, primarily from the Gilead collaboration. The net decrease of $2 million was due to a decrease in shared collaboration costs of $10 million primarily from the timing of clinical manufacturing; with a corresponding decrease in reimbursements for shared expenses of $8 million. Non-cash stock-based compensation expense was $8 million for each of the third quarter 2023 and 2022. R&D expenses were $247 million for the nine months ended September 30, 2023, compared to $208 million for the same period in 2022. For third quarter 2023 and 2022, Arcus recognized reimbursements of $33 million and $41 million, respectively, for shared expenses from its collaborations, primarily the Gilead collaboration. Reimbursements were $119 million for the nine months ended September 30, 2023, compared to $111 million for the same period in 2022. R&D expense by quarter may fluctuate due to the timing of clinical manufacturing and standard-of-care therapeutic purchases with a corresponding impact on reimbursements.
•General and Administrative (G&A) Expenses were $30 million for the third quarter 2023, compared to $26 million for the same period in 2022. The increase was primarily driven by the increased complexity of supporting Arcus’s expanding clinical pipeline and partnership obligations. Non-cash stock-based compensation expense was $10 million for the third quarter 2023, compared to $8 million for the same period in 2022. G&A expenses were $88 million for the nine months ended September 30, 2023, compared to $76 million for the same period in 2022.
•Net Loss was $71 million for the third quarter 2023, compared to $65 million for the same period in 2022. The increase in net loss included an increase of $2 million in income tax expense primarily due to an increase in taxable income compared to the prior year. Net loss was $226 million for the nine months ended September 30, 2023, compared to $200 million for the same period in 2022.

Arcus Ongoing and Announced Clinical Studies:
Trial Name Arms Setting Status NCT No.
Lung Cancer
ARC-7 zim vs. dom + zim vs. etruma + dom + zim 1L NSCLC (PD-L1 ≥ 50%) Ongoing Randomized Phase 2 NCT04262856
PACIFIC-8
(Operationalized by AZ)
dom + durva vs. durva Curative-Intent Stage 3 NSCLC Ongoing Registrational Phase 3 NCT05211895
ARC-10 dom + zim vs. pembro 1L NSCLC (PD-L1 ≥ 50%) Ongoing Registrational Phase 3 NCT04736173
STAR-121
(Operationalized by Gilead)
dom + zim + chemo vs. pembro + chemo 1L NSCLC (PD-L1 all-comers) Ongoing Registrational Phase 3 NCT05502237
EDGE-Lung dom +/- zim +/- quemli +/- chemo 1L/2L NSCLC (lung cancer platform study) Ongoing Randomized Phase 2 NCT05676931
VELOCITY-Lung
(Operationalized by Gilead)
dom +/- zim +/- etruma +/- sacituzumab govitecan-hziy or other combos 1L/2L NSCLC (lung cancer platform study) Ongoing Randomized Phase 2 NCT05633667
Gastrointestinal Cancers
ARC-9 etruma + zim + mFOLFOX vs. SOC 2L/3L/3L+ CRC
Ongoing
Randomized Phase 2
NCT04660812
EDGE-Gastric (ARC-21) dom +/- zim +/- quemli +/- chemo 1L/2L Upper GI Malignancies
Ongoing
Randomized Phase 2
NCT05329766
STAR-221 dom + zim + chemo vs. nivo + chemo 1L Gastric, Gastroesophageal Junction (GEJ) and Esophageal Adenocarcinoma (EAC) Ongoing Registrational Phase 3 NCT05568095
Pancreatic Cancer
ARC-8 quemli + zim + gem/nab-pac vs. quemli + gem/nab-pac 1L, 2L PDAC Ongoing Randomized Phase 1/1b NCT04104672
Prostate Cancer
ARC-6 etruma + zim + SOC vs. SOC 2L/3L CRPC Ongoing Randomized Phase 2 NCT04381832
Renal Cancer
ARC-20 AB521 Cancer Patients / ccRCC Ongoing Phase 1/1b NCT05536141
Other
ARC-25 AB598 Advanced Malignancies Ongoing NCT05891171
ARC-26 AB801 Healthy Volunteers Ongoing NCT06004921
ARC-27 AB801 Advanced Malignancies Planned NCT06120075

dom: domvanalimab; durva: durvalumab; etruma: etrumadenant; gem/nab-pac: gemcitabine/nab-paclitaxel; nivo: nivolumab; pembro: pembrolizumab; quemli: quemliclustat; SOC: standard of care; zim: zimberelimab;
ccRCC: clear-cell renal cell carcinoma; CRC: colorectal cancer; CRPC: castrate-resistant prostate cancer; GI: gastrointestinal; NSCLC: non-small cell lung cancer; PDAC: pancreatic ductal adenocarcinoma.