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OS Therapies Announces Shelving of U.S. FDA Commissioner's National Priority Voucher Has No Impact on the Company

Sentiment and the balance of points

Rhea-AI Sentiment reads the wording of the document, how positive or negative its language is on a 1 to 5 scale. The balance of points shown with the takes weighs what the document actually discloses, so the two can disagree, for example when a trial that missed its main goal is described in upbeat language.

OS Therapies (NYSE American: OSTX) said shelving the FDA Commissioner's National Priority Voucher does not affect its rare pediatric disease voucher prospects. The separate statutory program remains authorized through September 30, 2029, and its vouchers are transferable. OST-HER2 may qualify if it receives FDA approval on or before that date; a voucher has not been awarded.

The company received approximately $900,000 in its latest UK research and development tax credit, providing non-dilutive funding. OS Therapies intends to complete its FDA biologics license application for OST-HER2 in osteosarcoma in the fourth quarter of 2026 and anticipates requesting conditional marketing authorizations in the UK and European Union during that quarter. The company views a potential voucher sale as a source of funding for further drug development without issuing equity.

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4 points · 0 major

How this balance works

Rhea-AI gives every point it takes from this document a weight. Minor counts 1, Moderate 3 and Major 9, so one Major point outweighs several Minor ones. The bar adds up the weights on each side, and when neither side holds more than 65% of the total the balance reads Mixed.

It reads the document as published, with the same rules for every company, and it does not look at what the market expected or at how the stock traded, so a point can be objectively good on a day the stock falls.

Rhea-AI Sentiment measures something else, the tone of the wording.

0 major · 1 point

Hollow bars mark forward-looking points. How the balance works

Positive

  • Moderate pointUK research and development tax credit provided approximately $900,000 in non-dilutive funding. 2.6% of market cap
  • Moderate point. Forward-looking: it has not happened yet and may not happen.OST-HER2 FDA biologics license application submission is planned for completion in fourth-quarter 2026.
  • Moderate point. Forward-looking: it has not happened yet and may not happen.OST-HER2 conditional marketing authorization requests in the UK and EU are anticipated in fourth-quarter 2026.
  • Minor pointRare pediatric disease voucher prospects remain unaffected by shelving the separate commissioner voucher program, OS Therapies said.

Negative

  • Minor point. Forward-looking: it has not happened yet and may not happen.OST-HER2 voucher eligibility depends on FDA approval on or before September 30, 2029.

Key Figures

UK R&D tax credit: Approximately $900,000 PRV eligibility cutoff: On or before September 30, 2029 BLA submission timing: Fourth quarter of 2026
UK R&D tax credit
Approximately $900,000
Latest tax credit received
PRV eligibility cutoff
On or before September 30, 2029
OST-HER2 may qualify for a PRV if FDA-approved by this date
BLA submission timing
Fourth quarter of 2026
Company intends to complete the U.S. FDA submission for OST-HER2

Historical Context

1 past event · Latest: Nov 10
1 event
  1. Nov 10

    UK application

    24h Move
    -3.3%

    Initiated U.K. conditional application; U.S. BLA timing and PRV prospects remained subject to FDA alignment.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

priority review voucher, biologics license application, conditional marketing authorisation applications, orphan drug designation, +1 more
5 terms
priority review voucher regulatory
"the FDA's rare pediatric disease PRV program, a statutory program"
A priority review voucher is a transferable regulatory incentive that lets a company move a future drug or device application to the front of the review line, shortening the review period by several months. For investors it matters because the voucher can speed up market access for a high-value product or be sold to other companies for significant cash, acting like a tradable fast-pass that can accelerate revenue or create immediate financial upside.
biologics license application regulatory
"complete a Biologics License Application (BLA) submission to the U.S. FDA"
A biologics license application is a formal request submitted to regulatory authorities seeking approval to market a new biological medicine, such as vaccines or treatments made from living organisms. It is a comprehensive review process that evaluates the safety, effectiveness, and manufacturing quality of the product. For investors, receiving approval signals that a biological therapy can be sold to the public, potentially leading to revenue growth and market success.
conditional marketing authorisation applications regulatory
"requesting Conditional Marketing Authorisation Applications (CMAAs)"
An application seeking temporary regulatory approval to sell a medicine or vaccine based on early positive data, with the condition that the company must provide complete safety and effectiveness evidence later. For investors, this is like a provisional permit: it can allow early sales and revenue but carries higher regulatory risk and uncertainty because final approval depends on future data and inspections.
orphan drug designation regulatory
"received Orphan Drug Designation (ODD), Fast Track Designation"
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.
advanced therapy medicinal products regulatory
"and Advanced Therapy Medicinal Products (ATMP) from the European Medicines Agency"
Medicines that use genes, cells, or engineered tissues to prevent, treat, or cure disease by repairing, replacing, or reprogramming parts of the body. They are developed and regulated differently from conventional drugs because they involve living material and complex manufacturing; think of them like biological “repairs” or software updates for the body. Investors pay attention because development costs, regulatory hurdles, manufacturing scale-up, and potential pricing can drive large swings in company value.

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

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  • OST-HER2 remains eligible for Priority Review Voucher ("PRV") if approved by the U.S. Food and Drug Administration's ("FDA") on or before September 30, 2029
  • Company continues to benefit from its UK research and development program, through which it received approximately $900,000 in non-dilutive tax credits

Grasonville, Maryland--(Newsfile Corp. - November 13, 2026) - OS Therapies Inc. (NYSE American: OSTX) ("OS Therapies" or the "Company"), the world leader in gene-edited, Listeria-based cancer immunotherapies, today announced that the FDA's shelving of the Commissioner's National Priority Voucher ("CNPV") has no impact on the Company's rare pediatric disease PRV prospects. The shelving does not affect the FDA's rare pediatric disease PRV program, a statutory program currently authorized through September 30, 2029, under which vouchers are transferable. OST-HER2 may qualify for a PRV if it is approved by the FDA on or before September 30, 2029.

"This action by the FDA does not affect OST-HER2's potential eligibility for a PRV, which, if received, could be an important source of non-dilutive capital to support the further development of our drug platform and new therapies to treat critical unmet needs," said Frank Knuettel II, OS Therapies' Chief Financial Officer. Mr. Knuettel continued "Receiving a PRV will represent a major value driver for our shareholders. When monetized, it will fund our ongoing R&D without equity dilution providing us with tremendous financial and strategic flexibility."

Additionally, OS Therapies continues to benefit from its UK research and development program and announces that it has received approximately $900,000 in the latest tax credit from the HM Revenue and Customers department of the UK government.

About OS Therapies
OS Therapies is a clinical stage oncology company focused on the identification, development, and commercialization of treatments for Osteosarcoma and other solid tumors. The Company is the world leader in gene-edited, Listeria-based cancer immunotherapies. OST-HER2, the Company's lead asset, is an immunotherapy leveraging the immune-stimulatory effects of Listeria bacteria to initiate a strong immune response targeting the HER2 protein. OST-HER2 is designed to target two mutated extracellular epitopes and one mutated intracellular epitope of the HER2 oncogene, requiring only one of these three epitopes to be present in a tumor (or micro-metastasis) to trigger the desired immune response. OST-HER2 has received Orphan Drug Designation (ODD), Fast Track Designation (FTD) and Rare Pediatric Disease Designation (RPDD) from the FDA and has received ODD, and Advanced Therapy Medicinal Products (ATMP) from the European Medicines Agency.

The Company reported positive data in its Phase 2b clinical trial of OST-HER2 in the prevention or delay of recurrence in fully resected, pulmonary metastatic osteosarcoma, demonstrating clinically significant benefit in the 12-month event free survival (EFS) primary endpoint of the study and the overall survival (OS) secondary endpoint. The Company intends to complete a Biologics License Application (BLA) submission to the U.S. FDA for OST-HER2 in osteosarcoma in the fourth quarter of 2026 and, if approved, would become eligible to receive a PRV that it could then sell. The Company also anticipates requesting Conditional Marketing Authorisation Applications (CMAAs) from the U.K.'s Medicines and Healthcare products Regulatory Agency (MHRA) and the European Medicines Agency (EMA)for OST-HER2 in the fourth quarter of 2026. OST-HER2 has completed a Phase 1 clinical study primarily in breast cancer patients, in addition to showing preclinical efficacy data in various models of breast cancer. OST-HER2 was previously conditionally approved by the U.S. Department of Agriculture for the treatment of canines with osteosarcoma. The Company has also completed dosing in a Phase 1 study of OST-504 for castration-resistant prostate cancer.

In addition, OS Therapies is advancing its next-generation Antibody Drug Conjugate (ADC) and Drug Conjugates (DC), known as tunable ADC (tADC), which features tunable, tailored antibody-linker-payload candidates. This platform leverages the Company's proprietary silicon Si-Linker and Conditionally Active Payload (CAP) technology, enabling the delivery of multiple payloads per linker. For more information, please visit www.ostherapies.com.

Forward-Looking Statements

This press release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, which are subject to the safe harbor created by the Private Securities Litigation Reform Act of 1995. Forward-looking statements include, without limitation, statements regarding the timing of the Company's planned BLA submission and applications for conditional marketing authorization; the clinical development, regulatory review and potential approval and commercialization of OST-HER2; and the Company's potential eligibility for, receipt of, and ability to sell a PRV. Words such as "anticipate," "believe," "could," "expect," "intend," "may," "plan," "potential," "should," "will" and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these words. These statements are based on the current expectations and assumptions of OS Therapies and its management and are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such forward-looking statements. Such risks and uncertainties include, but are not limited to: changes in U.K. tax law or HMRC practice; fluctuations in foreign currency exchange rates; chemistry, manufacturing and controls (CMC) matters relating to OST-HER2; OST-HER2 product stability; the timing and outcome of regulatory submissions and the potential approval of OST-HER2 by the FDA and applicable foreign regulatory authorities; changes in, or the suspension, expiration or termination of, FDA priority review voucher programs, and the market value of any priority review voucher; the Company's funding runway and need for substantial additional capital; and the other risks and uncertainties described under the heading "Risk Factors" in the Company's most recent Annual Report on Form 10-K, subsequent Quarterly Reports on Form 10-Q and other filings with the Securities and Exchange Commission. The forward-looking statements contained in this press release speak only as of the date of this press release, and OS Therapies undertakes no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by applicable law.

OS Therapies Contact Information:

INVESTOR CONTACT
Harrison Seidner, PhD
WaterSeid Partners
OSTX@waterseid.com

MEDIA CONTACT
James Lambert
Vice President
Rubenstein Public Relations
jlambert@rubensteinpr.com
212-805-3024

https://x.com/OSTherapies
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https://www.linkedin.com/company/os-therapies/

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/323890

FAQ

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

Does shelving the FDA Commissioner's National Priority Voucher affect OS Therapies' OST-HER2 voucher prospects?

OS Therapies said shelving the commissioner voucher program does not affect OST-HER2's potential eligibility under the separate rare pediatric disease program. OST-HER2 may qualify for a transferable voucher if FDA approval occurs on or before September 30, 2029.

How much did OS Therapies receive from its latest UK research and development tax credit?

OS Therapies received approximately $900,000 in its latest UK research and development tax credit. The funding is non-dilutive, meaning it does not require issuing additional equity.

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