Fennec Pharmaceuticals Announces FDA Acceptance for Filing of New Drug Application Resubmission for PEDMARK™

~ Prescription Drug User Fee Act (PDUFA) target action date set for September 23, 2022 ~

RESEARCH TRIANGLE PARK, N.C., , April 27, 2022 (GLOBE NEWSWIRE) — Fennec Pharmaceuticals Inc. (NASDAQ:FENC; TSX: FRX), a specialty pharmaceutical company, today announced that the U.S. Food and Drug Administration (FDA) has accepted for filing the Company’s resubmitted New Drug Application (NDA) for PEDMARK^TM (a unique formulation of sodium thiosulfate (STS)) for the prevention of platinum-induced ototoxicity in pediatric patients one month to <18 years of age with localized, non-metastatic, solid tumors. The PDUFA target action date for the NDA is September 23, 2022.

“We are pleased that the FDA has accepted our resubmission and we look forward to working with the Agency to facilitate their review of our NDA. If approved, PEDMARK^TM has the potential to become a transformative treatment for pediatric patients at risk of cisplatin induced ototoxicity,” said Rosty Raykov, chief executive officer of Fennec Pharmaceuticals.

PEDMARK has received both Breakthrough Therapy and Fast Track Designation by the FDA.

About PEDMARK™

Cisplatin and other platinum compounds are essential chemotherapeutic agents for many pediatric malignancies.  Unfortunately, platinum-based therapies cause ototoxicity, or hearing loss, which is permanent, irreversible and particularly harmful to the survivors of pediatric cancer.

In the U.S. and Europe, it is estimated that, annually, over 10,000 children may receive platinum-based chemotherapy.  The incidence of ototoxicity depends upon the dose and duration of chemotherapy, and many of these children require lifelong hearing aids. There is currently no established preventive agent for this hearing loss and only expensive, technically difficult and sub-optimal cochlear (inner ear) implants have been shown to provide some benefit. Infants and young children that suffer ototoxicity at critical stages of development lack speech language development and literacy, and older children and adolescents lack social-emotional development and educational achievement.

PEDMARK has been studied by cooperative groups in two Phase 3 clinical studies of survival and reduction of ototoxicity, The Clinical Oncology Group Protocol 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, and medulloblastoma.  SIOPEL 6 enrolled only hepatoblastoma patients with localized tumors.

The Marketing Authorization Application (MAA) for sodium thiosulfate (tradename PEDMARQSI) is currently under evaluation by the European Medicines Agency (EMA).  PEDMARK has received Breakthrough Therapy and Fast Track Designation by the FDA in March 2018.

About Fennec Pharmaceuticals

Fennec Pharmaceuticals Inc. is a specialty pharmaceutical company focused on the development of PEDMARK™ for the prevention of platinum-induced ototoxicity in pediatric patients.   Further, PEDMARK has received Orphan Drug Designation in the U.S. for this potential use. Fennec has a license agreement with Oregon Health and Science University (OHSU) for exclusive worldwide license rights to intellectual property directed to sodium thiosulfate and its use for chemoprotection, including the prevention of ototoxicity induced by platinum chemotherapy, in humans.  For more information, please visit www.fennecpharma.com

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 the Company’s expectations regarding its interactions and communications with the FDA, including the Company’s expectations and goals respecting the resolution the issues raised in the CRL and the Company’s plans to address them, and the anticipated timing of the Company’s finalization and filing of an NDA resubmission for PEDMARK.  Forward-looking statements are subject to certain risks and uncertainties inherent in the Company’s business that could cause actual results to vary, including such risks and uncertainties relating to the Company’s reliance on third party manufacturing, the risk that unforeseen factors may delay the resubmission of the NDA, the risks of delays in or failure to obtain FDA approval of PEDMARK, the risks relating to the Company’s and its manufacturer’s ability to adequately address the concerns identified in the CRL, the risk that the resubmission of the NDA to the FDA will not be satisfactory, 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, 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, 2021.  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.

For further information, please contact:

Investors:
Robert Andrade
Chief Financial Officer
Fennec Pharmaceuticals Inc.
(919) 246-5299

Media:
Elixir Health Public Relations
Lindsay Rocco
(862) 596-1304
lrocco@elixirhealthpr.com