Fennec shares new PEDMARK data in adult HNC
Fennec Pharmaceuticals Inc. reported new real-world data on its drug PEDMARK® in adults with head and neck cancers.
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Rhea-AI Filing Summary
Fennec Pharmaceuticals Inc. reported new real-world data on its drug PEDMARK® in adults with head and neck cancers. In a multi-institutional retrospective review of 15 adult patients, PEDMARK given at least six hours after cisplatin was feasible, well tolerated, and did not disrupt cisplatin-based treatment delivery.
Investigators observed early signals of hearing preservation, including that most high-risk patients receiving PEDMARK showed no measurable hearing loss during or after treatment, despite frequent baseline impairment. PEDMARK is currently approved in the United States only to reduce the risk of ototoxicity from cisplatin in pediatric patients with localized, non-metastatic solid tumors, and its safety and efficacy in adults with head and neck cancers have not been established.
8-K Event Classification
FAQ
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What did Fennec Pharmaceuticals (FENC) announce about PEDMARK in this 8-K?
How many adult patients were included in FENC’s PEDMARK head and neck cancer review?
What potential benefit did PEDMARK show for adults with head and neck cancer?
Is PEDMARK currently approved for adults with head and neck cancers?
What is PEDMARK’s current approved indication mentioned in the FENC filing?
Where were the new PEDMARK data presented according to Fennec Pharmaceuticals?
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
Form
Current Report
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Item 8.01. | Other Events. |
On February 20, 2026, Fennec Pharmaceuticals Inc. (the “Company”) announced that real-world data supporting the potential use of PEDMARK® (sodium thiosulfate injection) in adults with head and neck cancers were presented at the 2026 Multidisciplinary Head and Neck Cancers Symposium held February 19–21, 2026.
The data, derived from a retrospective review of 15 adult patients, indicated that PEDMARK® administered at least six hours after cisplatin was feasible and well tolerated, with no disruption to cisplatin-based treatment delivery observed.
PEDMARK® is approved in the United States to reduce the risk of ototoxicity associated with cisplatin in pediatric patients one month of age and older with localized, non-metastatic solid tumors. Its safety and efficacy in adults with head and neck cancers have not been established.
A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K.
The information contained in this Item 8.01, including Exhibit 99.1 attached hereto, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, nor incorporated by reference into any filing under the Securities Act of 1933, as amended, except as expressly set forth by specific reference in such filing.
Item 9.01 | Financial Statements and Exhibits. |
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Exhibit 99.1 | Press Release dated February 20, 2026 |
Exhibit 104 | Cover Page Interactive Data File (the cover page XBRL tags are embedded within the inline XBRL document) |
SIGNATURE
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 hereunto duly authorized.
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| FENNEC PHARMACEUTICALS INC. |
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Date February 20, 2026 | By: | /s/ Robert Andrade |
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| Robert Andrade Chief Financial Officer |
Exhibit 99.1
FENNEC PHARMACEUTICALS PRESENTS REAL WORLD DATA SUPPORTING THE integration AND CLINICAL USE OF Pedmark® IN TREATING ADULTS WITH HEAD & nECK CANCERS
– Administration of PEDMARK® Approximately Six Hours After Cisplatin was Shown to Be Safe & Easily Integrated into Care for Adults with Head & Neck Cancers (HNC) –
– Early Signals of Hearing Preservation Highlight the Potential of PEDMARK® to Address Cisplatin-Induced Hearing Loss, a Critical Survivorship Gap, Without Compromising Cisplatin’s Established Antitumor Activity –
– Majority of High-Risk Patients Receiving PEDMARK® Demonstrated No Measurable Hearing Loss During or After Treatment Despite Prevalence of Baseline Hearing Impairment –
Research Triangle Park, NC, February 20, 2026 – Fennec Pharmaceuticals Inc. (NASDAQ:FENC; TSX: FRX), a specialty pharmaceutical company, today announced new real world data supporting potential use of PEDMARK® (sodium thiosulfate injection) in adults with head and neck cancers were presented as a digital poster at the 2026 Multidisciplinary Head and Neck Cancers Symposium (MHNCS) in Palm Desert, CA from February 19 – 21, 2026.
Findings from a multi-institutional retrospective review of 15 adults with head and neck cancers (HNC) showed that PEDMARK® could be safely given ≥six hours after cisplatin dosing and was easy to incorporate into the real-world care plan for adults with HNC. This strict post-cisplatin timing is a validated approach intended to preserve cisplatin antitumor activity and no disruption to curative-intent cisplatin-based treatment delivery was observed as part of the study review.
“Head and neck cancer is one of the most common cancers globally,i underscoring why these results are encouraging for clinicians. Importantly, the data support the potential of the drug to address cisplatin-induced hearing loss – a major and often overlooked survivorship challenge – without compromising cisplatin’s proven antitumor activity,” said Maria A. Velez, M.D., M.S., coauthor of the study and clinical instructor in the Division of Hematology/Oncology at UCLA Health.
“Cisplatin-induced hearing loss remains one of the most underrecognized yet deeply consequential toxicities associated with cancer treatment,” said Leslie Worona, FNP-BC, OCN, coauthor of the study and oncology nurse practitioner at Mount Sinai Hospital. “The findings that most patients – even those with high rates of pre-existing hearing impairment – who received PEDMARK® experienced no measurable hearing loss during or after treatment supports further exploration of PEDMARK® use in additional patient populations and tumor types such as HNC.”
PEDMARK was shown to be well tolerated, with only isolated, self-limited infusion events and no grade 3 or 4 toxicities.
“These new findings are critical to demonstrating the feasibility, scalability and long-term value of PEDMARK® beyond those studied in our pivotal clinical program,” said Pierre S. Sayad, PhD, M.S., chief medical officer of Fennec Pharmaceuticals. “Additionally, these data may help to strengthen the case for broader clinical adoption in a sizable patient population at high risk for permanent hearing loss.”
The study’s primary endpoint evaluated feasibility, defined by timing adherence (≥6 hours) and operational metrics, including administration setting (home vs. clinic infusion) and chair time for infusion-center dosing. Secondary endpoints included infusion-related events, need for antiemetic escalation, and completion of on-treatment and post-treatment audiology assessments.
PEDMARK® is currently approved for pediatric patients one month of age and older with localized, non-metastatic solid tumors, and is also recognized by the National Comprehensive Cancer Network with a 2A recommendation for use in adolescent and young adult patients.
About Cisplatin-Induced Ototoxicity
Cisplatin and other platinum-based chemotherapies are widely used to treat solid tumors and have been vital in improving survival rates. Unfortunately, these life-saving treatments often result in permanent, irreversible hearing loss, also known as ototoxicity.ii
Hearing loss from cisplatin treatment is not rare. Studies show that between 60-90% of patients treated with cisplatin may develop hearing loss, depending upon the dose and duration of chemotherapyiii. Many of those treated with cisplatin will require lifelong hearing aids or cochlear implants, which can be helpful for some, but do not reverse the hearing loss and can be costly over time.iv Treatment-induced hearing loss can reduce quality of survivorship as it impacts many aspects of life, such as speech and language skills, academic performance, social-emotional development, career potential and the ability to live independently.v,vi While audiologic monitoring is recommended to help manage ototoxicity, it is currently underutilized in certain cancer patient populations.
PEDMARK® (sodium thiosulfate injection)
PEDMARK® is the first and only U.S. Food and Drug Administration (FDA) approved therapy indicated to reduce the risk of ototoxicity associated with cisplatin treatment in pediatric patients 1 month of age and older with localized, non-metastatic, solid tumors. It is a unique formulation of sodium thiosulfate in single-dose, ready-to-use vials for intravenous use in pediatric patients. PEDMARK is also the first and only therapeutic agent with proven efficacy and safety data with an established dosing regimen, across two open-label, randomized Phase 3 clinical studies, the Children’s Oncology Group (COG) Protocol ACCL0431 and SIOPEL 6.
Additionally, PEDMARK is recommended for the adolescent and young adult (AYA) population by the National Comprehensive Cancer Network, or NCCN, with a 2A endorsement.
Approximately 500,000 patients in the U.S. are diagnosed annually with cancers that could be treated with a platinum-based chemotherapy.vii,viii The incidence of ototoxicity depends upon the dose and duration of chemotherapy, and many of those treated will require lifelong hearing aids. Until the FDA approval of PEDMARK, there were no preventative agents for this hearing loss. Patients with hearing loss resulting from cancer treatment have a statistically significant worse quality of life compared with peers who have no hearing loss.ixx
PEDMARK has been studied by co-operative groups in two Phase 3 clinical studies of survival and reduction of ototoxicity, COG ACCL0431 and SIOPEL 6. Both studies have been completed. The COG ACCL0431 protocol enrolled childhood cancers typically treated with intensive cisplatin therapy for localized and disseminated disease, including newly diagnosed hepatoblastoma, germ cell tumor, osteosarcoma, neuroblastoma, medulloblastoma, and other solid tumors. SIOPEL 6 enrolled only hepatoblastoma patients with localized tumors.
Indications and Usage
PEDMARK® (sodium thiosulfate injection) is indicated to reduce the risk of ototoxicity associated with cisplatin in pediatric patients 1 month of age and older with localized, non-metastatic solid tumors.
Limitations of Use
The safety and efficacy of PEDMARK have not been established when administered following cisplatin infusions longer than 6 hours. PEDMARK may not reduce the risk of ototoxicity when administered following longer cisplatin infusions, because irreversible ototoxicity may have already occurred.
Important Safety Information
PEDMARK is contraindicated in patients with history of a severe hypersensitivity to sodium thiosulfate or any of its components.
Hypersensitivity reactions occurred in 8% to 13% of patients in clinical trials. Monitor patients for hypersensitivity reactions. Immediately discontinue PEDMARK and institute appropriate care if a hypersensitivity reaction occurs. Administer antihistamines or glucocorticoids (if appropriate) before each subsequent administration of PEDMARK. PEDMARK may contain sodium sulfite; patients with sulfite sensitivity may have hypersensitivity reactions, including anaphylactic symptoms and life-threatening or severe asthma episodes. Sulfite sensitivity is seen more frequently in people with asthma.
PEDMARK is not indicated for use in pediatric patients less than 1 month of age due to the increased risk of hypernatremia or in pediatric patients with metastatic cancers.
Hypernatremia occurred in 12% to 26% of patients in clinical trials, including a single Grade 3 case. Hypokalemia occurred in 15% to 27% of patients in clinical trials, with Grade 3 or 4 occurring in 9% to 27% of patients. Monitor serum sodium and potassium levels at baseline and as clinically indicated. Withhold PEDMARK in patients with baseline serum sodium greater than 145 mmol/L.
Monitor for signs and symptoms of hypernatremia and hypokalemia more closely if the glomerular filtration rate (GFR) falls below 60 mL/min/1.73m2.
Administer antiemetics prior to each PEDMARK administration. Provide additional antiemetics and supportive care as appropriate.
The most common adverse reactions (≥25% with difference between arms of >5% compared to cisplatin alone) in SIOPEL 6 were vomiting, nausea, decreased hemoglobin, and hypernatremia. The most common adverse reaction (≥25% with difference between arms of >5% compared to cisplatin alone) in COG ACCL0431 was hypokalemia.
Please see full Prescribing Information for PEDMARK® at: www.PEDMARK.com.
About Fennec Pharmaceuticals
Fennec Pharmaceuticals Inc. is a specialty pharmaceutical company committed to the fight against ototoxicity in cancer patients who receive cisplatin-based chemotherapy. Fennec is focused on the commercialization of PEDMARK® to reduce the risk of platinum-induced ototoxicity in cancer patients. PEDMARK received FDA approval in September 2022 and European Commission approval in June 2023 and United Kingdom (U.K.) approval in October 2023 under the brand name PEDMARQSIÒ.
In March 2024, Fennec entered into an exclusive licensing agreement under which Norgine Pharmaceuticals Ltd., a leading European specialist pharmaceutical company, will commercialize PEDMARQSI® in Europe, U.K., Australia and New Zealand. PEDMARQSI is now commercially available in the U.K. and Germany.
PEDMARK has received Orphan Drug Exclusivity in the U.S. and PEDMARQSI has received Pediatric Use Marketing Authorization in Europe which includes eight years plus two years of data and market protection. Further, Fennec has patents providing protection for PEDMARK until 2039 in both the U.S. and internationally.
For more information, please visit www.fennecpharma.com and follow on LinkedIn.
Forward Looking Statements
Except for historical information described in this press release, all other statements are forward-looking. Words such as “believe,” “anticipate,” “plan,” “expect,” “estimate,” “intend,” “may,” “will,” or the negative of those terms, and similar expressions, are intended to identify forward-looking statements. These forward-looking statements include statements about our business strategy, timeline and other goals, plans and prospects, including our commercialization plans respecting PEDMARK®/PEDMARQSI®, the market opportunity for and market impact of PEDMARK®/ PEDMARQSI®, its potential impact on patients and anticipated benefits associated with its use, future commercial and regulatory milestone and royalty payments from Norgine, and potential access to further funding after the date of this release. Forward-looking statements are subject to certain risks and uncertainties inherent in the Company’s business that could cause actual results to vary, including the risks and uncertainties that regulatory and guideline developments may change, scientific data and/or manufacturing capabilities may not be sufficient to meet regulatory standards or receipt of required regulatory clearances or approvals, clinical results may not be replicated in actual patient settings, unforeseen global instability, including political instability, or instability from an outbreak of pandemic or contagious disease, such as the novel coronavirus (COVID-19), or surrounding the duration and severity of an outbreak, protection offered by the Company’s patents and patent applications may be challenged, invalidated or circumvented by its competitors, the available market for the Company’s products will not be as large as expected, the Company’s products will not be able to penetrate one or more targeted markets, revenues will not be sufficient to fund further development and clinical studies, our ability to obtain necessary capital when needed on acceptable terms or at all, the Company may not meet its future capital requirements in different countries and municipalities, and other risks detailed from time to time in the Company’s filings with the Securities and Exchange Commission including its Annual Report on Form 10-K for the year ended December 31, 2024. Fennec disclaims any obligation to update these forward-looking statements except as required by law.
For a more detailed discussion of related risk factors, please refer to our public filings available at www.sec.gov and www.sedar.com.
PEDMARK® PEDMARQSI® and Fennec® are registered trademarks of Fennec Pharmaceuticals Inc.
©2025 Fennec Pharmaceuticals Inc. All rights reserved. FEN-1604-v1
For further information, please contact:
Investors:
Robert Andrade
Chief Financial Officer
Fennec Pharmaceuticals Inc.
+1 919-246-5299
Corporate and Media:
Lindsay Rocco
Elixir Health Public Relations
+1 862-596-1304
lrocco@elixirhealthpr.com
i Mody MD, Rocco JW, Yom SS, et al: Head and neck cancer. Lancet 398:2289-2299, 2021.
ii Rybak L. Mechanisms of Cisplatin Ototoxicity and Progress in Otoprotection. Current Opinion in Otolaryngology & Head and Neck Surgery. 2007, Vol. 15: 364-369.
iii Langer T, am Zehnhoff-Dinnesen A, Radtke S, Meitert J, Zolk O. Trends Pharmacol Sci. 2013;34(8):458-469
iv Landier W. Ototoxicity and Cancer Therapy. Cancer. June 2016 Vol. 122, No.11: 1647-1658.
v Clemens E, van den Heuvel-Eibrink MM, Mulder RL, et al. Recommendations for ototoxicity surveillance for childhood, adolescent, and young adult cancer survivors: a report from the International Late Effects of Childhood Cancer Guideline Harmonization Group in collaboration with the PanCare Consortium. Lancet Oncol. 2019;20(1):e29-e41
vi . Bass JK, Knight KR, Yock TI, Chang KW, Cipkala D, Grewal SS. Evaluation and management of hearing loss in survivors of childhood and adolescent cancers: a report from the children’s oncology group. Pediatr Blood Cancer. 2016;63(7):1152-1162.
vii Chattaraj A et al. Cisplatin-Induced Ototoxicity: A Concise Review of the Burden, Prevention, and Interception Strategies. JCO Oncol Pract. 2023;19
viii Freyer DR et al. Effects of sodium thiosulfate versus observation on development of cisplatin-induced hearing loss in children with cancer (ACCL0431): a multicentre, randomised, controlled, open-label, phase 3 trial. Lancet Oncol. 2017;18(1):63-74.
ix Rajput K, Edwards L, Brock P, Abiodun A, Simpkin P, Al-Malky G. Ototoxicity-induced hearing loss and quality of life in survivors of paediatric cancer. Int J Pediatr Otorhinolaryngol. 2020;138:110401. doi:10.1016/j.ijporl.2020.110401
x Bass JK, Knight KR, Yock TI, Chang KW, Cipkala D, Grewal SS. Evaluation and management of hearing loss in survivors of childhood and adolescent cancers: a report from the children’s oncology group. Pediatr Blood Cancer. 2016;63(7):1152-1162.