On May 14, 2025 Arbutus Biopharma Corporation (Nasdaq: ABUS) ("Arbutus" or the "Company"), a clinical-stage biopharmaceutical company focused on infectious disease, reported first quarter 2025 financial results and provided a corporate update (Press release, Arbutus Biopharma, MAY 14, 2025, View Source [SID1234653051]).
Schedule your 30 min Free 1stOncology Demo!
Discover why more than 1,500 members use 1stOncology™ to excel in:
Early/Late Stage Pipeline Development - Target Scouting - Clinical Biomarkers - Indication Selection & Expansion - BD&L Contacts - Conference Reports - Combinatorial Drug Settings - Companion Diagnostics - Drug Repositioning - First-in-class Analysis - Competitive Analysis - Deals & Licensing
Schedule Your 30 min Free Demo!
"To date, eight patients have reached functional cure following imdusiran combination therapy. Of particular note, two of those functional cure patients did not receive any interferon during the trial," said Lindsay Androski, President and CEO of Arbutus. "There are more than 250 million people suffering from cHBV globally. This type of functional cure data, in patients who successfully discontinued all cHBV treatments including NUCs, is an exciting milestone for Arbutus, clinicians, and patients.
"In addition, our oral PD-L1 inhibitor, AB-101, achieved 100% receptor occupancy in 11 of 13 evaluable healthy volunteers in our Phase 1a/1b clinical trial at the 40 mg dose. The trial continues in cHBV patients, and across all cohorts there have been no AB-101-related SAEs and no evidence of liver dysfunction to date.
"Lastly, I am pleased to announce that Andrew Sung has joined Arbutus as General Counsel. Andrew brings a wealth of life sciences deal experience, from collaboration and licensing agreements to large M&A transactions and is an important and valuable addition to our team."
2025 Clinical Development Milestones
Imdusiran (AB-729)
At the European Association for the Study of the Liver (EASL) Congress 2025, the Company presented two posters with data from the IM-PROVE I Phase 2a clinical trial that evaluated imdusiran with nucleos(t)ide analogue (NA) therapy and pegylated interferon alfa-2a (IFN). One poster characterized the demographics and virological markers of six cHBV patients who achieved functional cure. The data showed that HBsAg at baseline was the only apparent marker in common associated with functional cure. In a second poster, the Company reported that patients who achieved functional cure in the 24-week IFN treatment cohorts experienced HBsAg loss that was associated with transient HBV RNA elevations that were preceded by or coincided with increases in immunological markers.
Also at EASL, the Company presented a poster in the late-breaker session with data from the IM-PROVE II Phase 2a clinical trial that evaluated imdusiran, ongoing NA therapy and Barinthus Biotherapeutics’ VTP-300, with or without low dose nivolumab. The data showed that 25% (2/8) of the patients who had baseline HBsAg <1000 IU/mL and received the addition of low dose nivolumab to the treatment regimen reached functional cure.
To date, the Company has reported a total of eight patients with cHBV who have been functionally cured following treatment with imdusiran and ongoing NA therapy in combination with either IFN or nivolumab plus an immunotherapeutic. Two of the eight patients received no IFN as part of the combination therapy. Seven of the eight patients who achieved functional cure had HBsAg <1000 IU/mL at baseline. According to the literature, patients with HBsAg levels <1000 IU/mL represent a significant portion of the cHBV population.
AB-101 (oral PD-L1 inhibitor)
AB-101-001 is a Phase 1a/1b double-blind, randomized, placebo-controlled clinical trial designed to investigate the safety, tolerability, pharmacokinetics, and pharmacodynamics of single- and multiple-ascending doses of AB-101, the Company’s oral PD-L1 inhibitor, in healthy subjects and patients with cHBV.
Data from Part 1 and Part 2 of this clinical trial which evaluated single- and multiple-ascending doses of AB-101 in healthy subjects showed that AB-101 was well-tolerated with evidence of dose-dependent receptor occupancy. In Part 1, all five evaluable subjects in the 40mg cohort showed evidence of 100% receptor occupancy. In Part 2, all subjects in the 40mg cohort showed evidence of high receptor occupancy between 74-100%, with six of the eight subjects demonstrating 100% receptor occupancy during the seven-day dosing period. Across Parts 1 and 2, eleven of the thirteen evaluable healthy subjects that received either single or multiple doses of 40mg of AB-101 achieved 100% receptor occupancy.
At EASL, the Company presented a poster with data from Part 3 of the clinical trial showing that 10mg of AB-101 once daily for 28 days was also well tolerated in patients with cHBV, with PD-L1 receptor occupancy similar to that observed in healthy volunteers who received multiple doses of AB-101 10mg once daily.
There were no serious adverse events or early discontinuations due to AB-101 and no evidence of liver dysfunction across the cohorts presented.
Part 3 of this clinical trial is ongoing.
LNP Litigation
Arbutus continues to consult closely with and support our exclusive licensee, Genevant Sciences, to protect and defend Arbutus’s intellectual property, which is the subject of on-going lawsuits against Moderna and Pfizer/BioNTech. The Company, together with Genevant, is seeking fair compensation for Moderna’s and Pfizer/BioNTech’s use of Arbutus’s patented LNP technology that was developed with great effort and at a great expense, and without which Moderna’s and Pfizer/BioNTech’s COVID-19 vaccines would not have been successful.
The claim construction hearing for the lawsuit against Pfizer/BioNTech occurred in December 2024. The court is expected to provide its ruling on the claim construction and issue a further scheduling order in 2025.
The jury trial in the Moderna U.S. litigation is scheduled for September 29, 2025. Expert discovery has concluded and the case is entering the summary judgment stage. In March 2025, the Company, alongside Genevant Sciences, filed five international lawsuits against Moderna and its affiliates seeking to enforce patents protecting the Company’s patented LNP technology across 30 countries. In the Unified Patent Court, Moderna’s Statement of Defense is due on July 8, 2025.
Corporate Updates
In April, the Company hired Andrew J. Sung as General Counsel. Mr. Sung brings over 20 years of legal experience representing and advising companies on corporate matters, intellectual property, compliance, contracting, litigation and employment issues. Mr. Sung, an MIT-trained chemist, has conducted multiple life sciences transactions including over $24 billion of M&A deals and licensing and collaboration agreements exceeding $4 billion in potential payments. Prior to Arbutus, Mr. Sung served as General Counsel of Harmonix Music Systems, Inc. for several years, leading the company’s sale to Epic Games, Inc., where he continued through the post-merger integration and transition. Mr. Sung was previously a Life Sciences Corporate Associate at Ropes & Gray LLP and a Senior Consultant in the Life Sciences practice at Cap Gemini Ernst & Young. Mr. Sung earned his J.D. from Harvard Law School and his B.S in Chemistry from the Massachusetts Institute of Technology.
Financial Results
Cash, Cash Equivalents and Investments
As of March 31, 2025, the Company had cash, cash equivalents and investments in marketable securities of $112.7 million compared to $122.6 million as of December 31, 2024. During the quarter ended March 31, 2025, the Company used $13.4 million in operating activities, which was partially offset by $2.7 million of proceeds from the exercise of employee stock options.
Revenue
Total revenue was $1.8 million for the quarter ended March 31, 2025, compared to $1.5 million for the same period in 2024. The increase of $0.3 million was due to an increase in revenue recognition of the upfront license fee received in 2022 from Qilu, the Company’s collaboration partner in China, Hong Kong, Macau and Taiwan, partially offset by a decrease in license royalty revenues in the 2025 period compared to the same period in 2024 due to a decrease in Alnylam’s sales of ONPATTRO.
Operating Expenses
Research and development expenses were $9.0 million for the quarter ended March 31, 2025 compared to $15.4 million for the same period in 2024. The decrease of $6.4 million was due primarily to cost savings from the Company’s decision in August 2024 to streamline the organization to focus its efforts on advancing the clinical development of imdusiran and AB-101, which included ceasing all discovery efforts, discontinuing its IM-PROVE III clinical trial and reducing the Company’s workforce.
General and administrative expenses were $5.8 million for the quarter ended March 31, 2025, compared to $5.3 million for the same period in 2024. This increase was due primarily to an increase in litigation-related legal fees, partially offset by a decrease in employee compensation-related expenses.
Restructuring costs in the quarter ended March 31, 2025 were $12.4 million, consisting of: (i) $6.0 million of cash severance and benefits; (ii) $2.3 million of non-cash stock-based compensation expenses for employee equity award modifications; and (iii), in connection with the decision to exit its corporate headquarters, (a) $3.8 million of non-cash impairment charges for laboratory equipment, leasehold improvements and its right-of-use asset and (b) $0.4 million of lease-related cash operating expenses. Substantially all of the termination severance payments and other employee benefits costs are expected to be paid during the second quarter of 2025, with the remainder to be paid in the second half of 2025.
Net Loss
For the quarter ended March 31, 2025, the Company’s net loss was $24.5 million, or a loss of $0.13 per basic and diluted common share, as compared to a net loss of $17.9 million, or a loss of $0.10 per basic and diluted common share, for the quarter ended March 31, 2024.
Outstanding Shares
As of March 31, 2025, the Company had 191.5 million common shares issued and outstanding, as well as 15.2 million stock options and unvested restricted stock units outstanding. Roivant Sciences Ltd. owned approximately 20% of the Company’s outstanding common shares as of March 31, 2025.
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF LOSS
(in thousands, except share and per share data)
Three Months Ended March 31,
2025 2024
Revenue
Collaborations and licenses $ 1,316 $ 939
Non-cash royalty revenue 448 593
Total revenue 1,764 1,532
Operating expenses
Research and development 8,959 15,403
General and administrative 5,832 5,312
Change in fair value of contingent consideration 299 180
Restructuring costs 12,373 —
Total operating expenses 27,463 20,895
Loss from operations (25,699) (19,363)
Other income (loss)
Interest income 1,197 1,545
Interest expense (28) (44)
Foreign exchange gain/(loss) 4 (13)
Total other income 1,173 1,488
Net loss $ (24,526) $ (17,875)
Net loss per common share
Basic and diluted $ (0.13) $ (0.10)
Weighted average number of common shares
Basic and diluted 190,707,085 175,625,552
UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands)
March 31,
2025 December 31,
2024
Cash, cash equivalents and marketable securities, current $ 112,707 $ 122,623
Accounts receivable and other current assets 4,101 4,693
Total current assets 116,808 127,316
Property and equipment, net of accumulated depreciation 168 3,309
Right of use asset — 1,048
Other non-current assets 34 34
Total assets $ 117,010 $ 131,707
Accounts payable and accrued liabilities $ 12,109 $ 7,564
Deferred license revenue, current 6,759 7,571
Lease liability, current 563 483
Total current liabilities 19,431 15,618
Liability related to sale of future royalties 4,409 4,829
Deferred license revenue, non-current 2,863 2,863
Contingent consideration 10,524 10,225
Lease liability, non-current 626 806
Total stockholders’ equity 79,157 97,366
Total liabilities and stockholders’ equity $ 117,010 $ 131,707
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
(in thousands)
Three Months Ended March 31,
2025 2024
Net loss $ (24,526) $ (17,875)
Non-cash items 5,866 1,439
Change in deferred license revenue (812) (244)
Other changes in working capital 6,081 (2,615)
Net cash used in operating activities (13,391) (19,295)
Net cash provided by investing activities 11,349 11,694
Issuance of common shares pursuant to the Open Market Sale Agreement — 21,765
Cash provided by other financing activities 2,784 2,665
Net cash provided by financing activities 2,784 24,430
Effect of foreign exchange rate changes on cash and cash equivalents 4 (13)
Increase in cash and cash equivalents 746 16,816
Cash and cash equivalents, beginning of period 36,330 26,285
Cash and cash equivalents, end of period 37,076 43,101
Investments in marketable securities 75,631 94,816
Cash, cash equivalents and marketable securities, end of period $ 112,707 $ 137,917
About Imdusiran (AB-729)
Imdusiran is an RNAi therapeutic specifically designed to reduce all HBV viral proteins and antigens including hepatitis B surface antigen, which is thought to be a key prerequisite to enable reawakening of a patient’s immune system to control the virus. Imdusiran targets hepatocytes using Arbutus’ novel covalently conjugated N-Acetylgalactosamine (GalNAc) delivery technology enabling subcutaneous delivery. To date, Arbutus has reported a total of eight patients with cHBV who have achieved a functional cure following treatment with imdusiran and NA therapy in combination with either IFN or low dose nivolumab plus an immunotherapeutic. Clinical data generated thus far has shown imdusiran to be generally safe and well-tolerated, while also providing meaningful reductions in hepatitis B surface antigen and hepatitis B DNA.
About AB-101
AB-101 is an oral PD-L1 inhibitor candidate that is designed to allow for controlled checkpoint blockade while minimizing the systemic safety issues typically seen with checkpoint antibody therapies. Immune checkpoints such as PD-1/PD-L1 play an important role in the induction and maintenance of immune tolerance and in T-cell activation, for example against HBV. In Arbutus’ ongoing Phase 1a/1b clinical trial, AB-101 has been generally safe and well-tolerated with evidence of high receptor occupancy.
About HBV
Hepatitis B is a potentially life-threatening liver infection caused by the hepatitis B virus (HBV). HBV can cause chronic infection which leads to a higher risk of death from cirrhosis and liver cancer. Chronic HBV infection represents a significant unmet medical need. The World Health Organization estimates that over 250 million people worldwide suffer from chronic HBV infection, while other estimates indicate that approximately 2 million people in the United States suffer from chronic HBV infection. Approximately 1.1 million people die every year from complications related to chronic HBV infection despite the availability of effective vaccines and current treatment options.