RedHill Biopharma partner receives $2.9M cancer grant

RedHill Biopharma Ltd. said its partner, the University of Oklahoma, received a five-year, $2.9 million National Cancer Institute grant planned to fund clinical trials of opaganib after CAR T-cell therapy for ultra-high-risk multiple myeloma.

Rhea-AI Filing Summary

RedHill Biopharma Ltd. said its partner, the University of Oklahoma, received a five-year, $2.9 million National Cancer Institute grant planned to fund clinical trials of opaganib after CAR T-cell therapy for ultra-high-risk multiple myeloma. The planned Phase 1b trial will enroll up to 18 patients to assess safety and determine an opaganib dose; a subsequent Phase 2 trial plans to enroll up to 21 additional patients to seek preliminary evidence of effectiveness.

The trials are planned in partnership with RedHill, which is expected to provide opaganib, and Lentigen Technology, Inc., which developed the CAR construct. CAR T cells will be manufactured on the University of Oklahoma campus. Opaganib is investigational and is not available for commercial distribution.

Filing Explained

The filing also makes this 6-K part of the listed Form S-8 and F-3 registration statements, except comments in the fourth and fifth paragraphs of Exhibit 99.1.

Key Figures

NCI grant: $2.9 million Grant duration: Five years Phase 1b planned enrollment: Up to 18 patients +1 more

4 metrics

NCI grant $2.9 million Grant awarded to the University of Oklahoma for the planned clinical development program.

Grant duration Five years NCI grant planned to fund two phases of clinical trials.

Phase 1b planned enrollment Up to 18 patients Safety and opaganib dose assessment.

Phase 2 planned enrollment Up to 21 additional patients Trial planned to seek preliminary evidence of effectiveness.

Key Terms

CAR T-cell therapy, SPHK2 selective inhibitor, GMP-grade lentiviral vector, Orphan Drug designation

4 terms

CAR T-cell therapy medical

"combination of CAR T-cell therapy and opaganib"

Car T-cell therapy is a medical treatment that uses a patient’s own immune cells, modified in a lab to better recognize and attack cancer cells. It is considered a breakthrough because it offers potentially long-lasting effects for certain types of cancer. For investors, its development and approval can signal advances in healthcare innovation and potential growth opportunities in the biotech sector.

SPHK2 selective inhibitor medical

"sphingosine kinase-2 (SPHK2) selective inhibitor drug"

GMP-grade lentiviral vector technical

"producing GMP-grade lentiviral vector for CAR T manufacturing"

Orphan Drug designation regulatory

"received Orphan Drug designation from the FDA"

Orphan drug designation is a special status given to medicines developed to treat rare diseases affecting only a small number of people. This status often provides benefits like faster approval processes and financial incentives, making it more attractive for companies to develop these drugs. For investors, it signals potential for exclusive market rights and reduced competition, which can impact the drug’s profitability.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How much NCI funding was awarded for RDHL's opaganib study?

The University of Oklahoma received a five-year, $2.9 million grant from the National Cancer Institute. The funding is planned to support two phases of clinical trials studying opaganib after CAR T-cell therapy.

How many patients are planned for the RDHL opaganib trials?

The planned Phase 1b trial will enroll up to 18 patients; a subsequent Phase 2 trial plans to enroll up to 21 additional patients. Phase 1b is intended to assess safety and determine an opaganib dose, while Phase 2 will seek preliminary evidence of effectiveness.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/19/2026 - 08:03 AM EDT Accepted by SEC EDGAR 10/19/2026 - 08:02 AM EDT Learn about SEC filing dates

 UNITED STATES   

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer

Pursuant to Rule 13a-16 or 15d-16

of the Securities Exchange Act of 1934

For the month of October 2026
Commission File No.:001-35773

REDHILL BIOPHARMA LTD.

(Translation of registrant’s name into English)

21 Ha’arba’a Street, Tel Aviv, 6473921, Israel

(Address of principal executive offices)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.  

Form 20-F ☒        Form 40-F ☐

Attached hereto and incorporated by reference herein are the following:

Exhibit 99.1: Registrant’s press release entitled “$2.9 Million NCI Grant Awarded for Clinical Development of RedHill's Opaganib and CAR T-Cell Combination in Ultra-High-Risk Multiple Myeloma”.

This Form 6-K (other than the comments in the fourth and fifth paragraphs of Exhibit 99.1) is hereby incorporated by reference into the Company's Registration Statements on Form S-8 filed with the Securities and Exchange Commission on May 2, 2013 (Registration No. 333-188286), on October 29, 2015 (Registration No. 333-207654), on July 25, 2017 (Registration No. 333-219441), on May 23, 2018 (Registration No. 333-225122), on July 24, 2019 (File No. 333-232776), on March 25, 2021 (File No. 333-254692), on May 3, 2021 (File No. 333-255710), on January 11, 2022 (File No. 333-262099), on June 27, 2022 (File No. 333-265845), on June 29, 2023 (File No. 333-273001), on June 20, 2024 (File No. 333-280327), on March 25, 2025 (File No. 333-286082) and on January 22, 2026 (File No. 333-292879), and its Registration Statements on Form F-3 filed with the Securities and Exchange Commission on March 30, 2021 (File No. 333-254848), on August 4, 2023 (File No. 333-273709), October 13, 2023 (File No. 333-274957), as amended, on August 9, 2024 (File No. 333-281417) and on July 2, 2026 (File No. 333-297223).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	REDHILL BIOPHARMA LTD.
	(the “Registrant”)
Date: October 19, 2026	By:	/s/ Dror Ben-Asher
	Name:	Dror Ben-Asher
	Title:	Chief Executive Officer

Exhibit 99.1

Press Release

$2.9 Million NCI Grant Awarded for Clinical Development of

RedHill’s Opaganib and CAR T-Cell Combination in

Ultra-High-Risk Multiple Myeloma

TEL-AVIV, Israel / RALEIGH, NC, October 19, 2026 /PRNewswire/ -- RedHill Biopharma Ltd. (Nasdaq: RDHL) (“RedHill” or the “Company”), a specialty biopharmaceutical company, today announced that its partner, the University of Oklahoma (OU), has received $2.9 million in funding from the National Cancer Institute (NCI) to study, in clinical trials, whether RedHill’s opaganib¹, given after CAR (chimeric antigen receptor) T-cell therapy, may help immune cells fight cancer more effectively.

The five-year, $2.9 million grant from the NCI is planned to fund two phases of clinical trials. A Phase 1b trial plans to enroll up to 18 patients to evaluate the safety of the treatment combination of CAR T-cell therapy and opaganib and determine the appropriate dosage of opaganib. A subsequent Phase 2 trial plans to enroll up to 21 additional patients to seek preliminary evidence of effectiveness.

CAR T-cell therapy takes a patient’s immune cells, genetically modifies them so they can recognize and attack cancer cells, and then returns them to the patient. In a first for Oklahoma, the CAR T cells will be manufactured on the OU campus rather than being sent to a commercial manufacturer, potentially saving both time and money.

“We need to find a novel, more effective treatment option for patients with ultra-high-risk multiple myeloma as they continue to have poor outcomes despite current treatments,” said grant awardee, Yubin Kang, M.D., OU Health hematologist-oncologist, division chief of Hematology, Bone Marrow Transplant and Cellular Therapy at OU Health Stephenson Cancer Center, and a professor at the OU College of Medicine. “With 10 years of preclinical studies on CAR T-cell therapy and opaganib, we believe the findings suggest that opaganib may help the modified immune cells remain active and continue attacking myeloma for longer. Opaganib works by blocking a protein called sphingosine kinase-2 (SPHK2), which appears to act as a kind of brake on the immune system’s cancer-fighting T cells. When SPHK2 was absent or blocked in mice, T cells multiplied more effectively and became better at killing myeloma cells. When combining opaganib with CAR T-cell therapy in vivo in mice, the results were encouraging, with tumor growth controlled for a longer period of time². I am excited to see whether combining CAR T-cell therapy with opaganib can produce longer-lasting responses and improve outcomes for these high-risk patients.”

Dr. Mark Levitt, RedHill’s Chief Scientific Officer said: “Opaganib has shown promise in preclinical studies as a potential combination therapy in a number of oncology and other indications. Prior preclinical and clinical work has shown that through a reduction of cancer cell survival proteins like c-Myc and Mcl-1³, opaganib can potentially play a role in the treatment of multiple myeloma. We congratulate Dr. Kang and OU on this grant, which has the potential to be an important step to determine through clinical trials, whether these preclinical findings can turn into reality.”

For patients with ultra-high-risk multiple myeloma, cancer often returns despite treatment, including bone marrow transplantation. CAR T-cell therapy is already an option for some patients whose cancer has returned.

The clinical trials will be conducted in partnership with RedHill, which is expected to provide opaganib, and Lentigen Technology, Inc., a Miltenyi Biotec, which developed the CAR construct. Miltenyi Biotec is enabling clinical translation by producing GMP-grade lentiviral vector for CAR T manufacturing on the CliniMACs Prodigy.

About the project

Research reported in this press release is supported by the National Cancer Institute of the National Institutes of Health under award No. R01CA293516-01A1.

About Opaganib (ABC294640)

Opaganib is a proprietary first-in-class investigational, orally administered sphingosine kinase-2 (SPHK2) selective inhibitor drug. Potentially broad-acting, it is in development for multiple oncology, viral, inflammatory, metabolic (diabetes and obesity) and additional indications.

Opaganib's suggested mechanism of action, published in the journal Drug Design, Development and Therapy, is host-directed and potentially broad-acting and is expected to maintain its effect against emerging viral variants. Opaganib is thought to work through the inhibition of multiple pathways, the induction of autophagy and apoptosis, and disruption of viral replication, through simultaneous inhibition of three sphingolipid-metabolizing enzymes in human cells (SPHK2, DES1 and GCS).

Opaganib has received Orphan Drug designation from the FDA for the treatment of neuroblastoma and cholangiocarcinoma. A Bayer-supported placebo-controlled randomized Phase 2 study is ongoing to evaluate the efficacy of opaganib in combination with Bayer's darolutamide in men with metastatic castrate-resistant prostate cancer (mCRPC), testing the potentially enhancing effect of opaganib in patients with a poor prognosis⁴. Opaganib also has a Phase 1 chemoradiotherapy study protocol ready for FDA-IND submission.

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Opaganib has demonstrated its safety and tolerability profile in more than 470 participants in multiple clinical studies and expanded access use, including a large global Phase 2/3 study in hospitalized patients with moderate to severe COVID-19, published in Microorganisms².

About the University of Oklahoma

Founded in 1890, the University of Oklahoma is a public research university with campuses in Norman, Oklahoma City and Tulsa. As the state’s flagship university, OU serves the educational, cultural, economic and healthcare needs of the state, region and nation. In Oklahoma City, the Harold Hamm Health Campus is one of the nation’s few academic health centers with seven health profession colleges located on the same campus. The Harold Hamm Health Campus serves approximately 4,000 students in more than 70 undergraduate and graduate degree programs spanning Oklahoma City and Tulsa and is the leading research institution in Oklahoma. For more information about the Harold Hamm Health Campus, visit www.ouhsc.edu.

About RedHill Biopharma

RedHill Biopharma Ltd. (Nasdaq: RDHL) is a U.S. specialty biopharmaceutical company primarily focused on the development and commercialization of proprietary drugs for gastrointestinal diseases, infectious diseases and oncology. RedHill promotes the FDA-approved gastrointestinal therapies Rebyota^®, for the prevention of recurrent C. diff infection (rCDI), and the bowel preparation treatment, Clenpiq^®. RedHill's key clinical late-stage development programs include: (i) opaganib (ABC294640), a first-in-class, orally administered sphingosine kinase-2 (SPHK2) selective inhibitor with anti-inflammatory, antiviral, metabolic and anticancer activity, targeting multiple indications with a track record of U.S. government and academic collaborations intended for medical countermeasure development including for Ebola virus disease, radiation exposure indications such as GI-Acute Radiation Syndrome (GI-ARS), a Phase 2/3 program for hospitalized COVID-19, and an ongoing Phase 2 study in prostate cancer in combination with darolutamide; (ii) RHB-102 (Bekinda), with a Phase 2-ready proof-of-concept study for GLP-1/GIP receptor agonist-associated GI intolerance, positive results from a first U.S. Phase 3 study for acute gastroenteritis and gastritis, positive results from a U.S. Phase 2 study for IBS-D and potential UK submission for chemotherapy and radiotherapy induced nausea and vomiting. RHB-102 is partnered with Hyloris Pharmaceuticals (EBR: HYL) for worldwide development and commercialization outside North America; (iii) RHB-204, a next-generation optimized formulation of RHB-104, with a Phase 2-ready study for Crohn's disease (based on RHB-104's positive U.S. Phase 3 Crohn's disease study results); and (iv) RHB-107 (upamostat), an oral broad-acting, host-directed, serine protease inhibitor with potential for pandemic preparedness, including COVID-19 and influenza and also targeting multiple cancer and inflammatory gastrointestinal diseases.

Visit www.redhillbio.com / X.com/RedHillBio for more information about the Company

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Forward-Looking Statements

This press release contains "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995 and may discuss investment opportunities, stock analysis, financial performance, investor relations, and market trends. Such statements may be preceded by the words "intends," "may," "will," "plans," "expects," "anticipates," "projects," "predicts," "estimates," "aims," "believes," "hopes," "potential" or similar words, and include, among others, statements regarding the NCI grant awarded to OU; the anticipated use of grant funding for the planned Phase 1b and Phase 2 trials; planned enrollment, timing and design of those trials and the potential benefits, if any, of opaganib in combination with CAR T-cell therapy. Forward-looking statements are based on certain assumptions and are subject to various known and unknown risks and uncertainties, many of which are beyond the Company’s control and cannot be predicted or quantified, and consequently, actual results may differ materially from those expressed or implied by such forward-looking statements. Such risks and uncertainties include, without limitation: the risk that the NCI funding may be reduced, delayed or terminated, or may be affected by broader uncertainty regarding government funding; the risks arising with trials conducted by a third party not controlled by RedHill; the risk that the trials may be delayed or may not demonstrate safety or efficacy; the risk that the acquisition of commercialization rights for Rebyota® and Clenpiq does not result in the planned commercial growth; the risk that opaganib is not accepted into Ebola virus disease control programs, or if accepted, that it does not demonstrate efficacy; the risk that development of RHB-204 for Crohn’s disease may not be completed, or if completed may not be approved or may not achieve commercial success; the risk that opaganib is not effective against the indications for which we develop our products; the risk that RHB-102 (Bekinda) does not effectively reduce GLP-1/GIP-related nausea, vomiting and diarrhea; the risk regarding the Company's ability to regain and maintain compliance with Nasdaq's listing requirements, including the minimum bid price requirement; the risk that the addition of new revenue generating products or out-licensing transactions will not occur; the risk that the Company will not receive future milestone payments under its existing agreements or that they will be less than anticipated; the risk of current uncertainty regarding U.S. government research and development funding and that the U.S. government is under no obligation to continue to support development of our products and can cease such support at any time; the risk that acceptance onto the RNCP Product Development Pipeline or other governmental and non-governmental development programs will not guarantee ongoing development or that any such development will not be completed or successful; the risk that the FDA does not agree with the Company's proposed development plans for its programs; the risk that the Company's development programs and studies may not be successful and, even if successful, such studies and results may not be sufficient for regulatory applications, including emergency use or marketing applications, and that additional studies may be required; the risk that the Company will not successfully commercialize its products; as well as risks and uncertainties associated with (i) the initiation, timing, progress and results of the Company's research, manufacturing, pre-clinical studies, clinical trials, and other therapeutic candidate development efforts, and the timing of the commercial launch of its commercial products and ones it may acquire or develop in the future; (ii) the Company's ability to advance its therapeutic candidates into clinical trials or to successfully complete its pre-clinical studies or clinical trials or the development of any necessary commercial companion diagnostics; (iii) the extent and number and type of additional studies that the Company may be required to conduct and the Company's receipt of regulatory approvals for its therapeutic candidates, and the timing of other regulatory filings, approvals and feedback; (iv) the manufacturing, clinical development, commercialization, and market acceptance of the Company's therapeutic candidates and Talicia; (v) the Company's ability to establish and maintain corporate collaborations; (vi) the Company's ability to acquire products approved for marketing in the U.S. that achieve commercial success and build its own marketing and commercialization capabilities; (vii) the interpretation of the properties and characteristics of the Company's therapeutic candidates and the results obtained with its therapeutic candidates in research, pre-clinical studies or clinical trials; (viii) the implementation of the Company's business model, strategic plans for its business and therapeutic candidates; (ix) the scope of protection the Company is able to establish and maintain for intellectual property rights covering its therapeutic candidates and its ability to operate its business without infringing the intellectual property rights of others; (x) parties from whom the Company licenses its intellectual property defaulting in their obligations to the Company; (xi) the Company’s ability to collect on its judgement against Kukbo; (xii) estimates of the Company's expenses, future revenues, capital requirements and needs for additional financing; (xiii) the effect of patients suffering adverse experiences using investigative drugs under the Company's Expanded Access Program; (xiv) competition from other companies and technologies within the Company's industry; and (xv) the hiring and employment commencement date of executive managers. More detailed information about the Company and the risk factors that may affect the realization of forward-looking statements is set forth in the Company's filings with the Securities and Exchange Commission (SEC), including the Company's Annual Report on Form 20-F filed with the SEC on April 27, 2026. All forward-looking statements included in this press release are made only as of the date of this press release. The Company assumes no obligation to update any written or oral forward-looking statement, whether as a result of new information, future events or otherwise unless required by law.

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Company contact:

Adi Frish

Chief Corporate & Business Development Officer

RedHill Biopharma

adi@redhillbio.com

Category: R&D

¹Opaganib is an investigational new drug, not available for commercial distribution.

²Yubin Kang, Xiaobei Wang, Jian Wu, Shaima Jabbar, Chongming Jiang, Xiliing Shen, Besim Ogretmen. Inhibition of Sphingosine Kinase 2 Enhances Immunotherapy in Mouse Model of Multiple Myeloma. (Oral presentation). 2023 ASH annual meeting, Dec 7-12, 2023, San Diego. https://ashpublications.org/blood/article/142/Supplement%201/876/502773/Inhibition-of-Sphingosine-Kinase-2-Enhances

³Abstract 7879: Opaganib in combination with oxaliplatin and doxorubicin as a novel salvage therapy for relapsed/refractory high-risk neuroblastoma. Jeremy Hengst, Mohammad Haque, Muhammad Younis, Thussenthan Walter Angelo, Anna Bourne, Katherine McClain, Meenakshi Shukla, Jonathan Lerch, Tarlan Arjmandi, Eric Cochran, Lynn Maines, Charles D. Smith, Vladimir S. Spiegelman, Jacqueline M. Kraveka, Giselle L. Saulnier Sholler. Cancer Res (2026) 86 (7_Supplement): 7879. https://doi.org/10.1158/1538-7445.AM2026-7879

⁴https://www.redhillbio.com/news/news-details/2025/RedHill-Announces-Initiation-of-Phase-2-Study-of-Opaganib-and-Darolutamide-in-Advanced-Prostate-Cancer/default.aspx

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Filing Exhibits & Attachments

1 document

Press Releases

• EX-99.1 EXHIBIT 99.1 25.9 KB