OS Therapies (OSTX) Unveils Encouraging Survivorship Data

Author: Addison Perry Updated: 10-10-2025 11:00 AM

OS Therapies Inc. Reports Promising Results in Bone Cancer Therapy

OS Therapies Inc. (NYSE: OSTX), a company focused on developing innovative cancer treatments, recently reported compelling findings from its Phase 2b clinical trial on OST-HER2, an off-the-shelf immunotherapy designed for addressing osteosarcoma, a challenging form of bone cancer.

Significant Survival Data from the Trial

The results revealed an impressive two-year overall survival rate of 75% among patients treated with OST-HER2, compared to only 40% in historical control groups. This statistic represents a crucial breakthrough in the attempt to delay or prevent recurrence in patients who have undergone surgical removal of their tumors.

Details from Patient Outcomes

Out of 36 patients who were evaluable for the study, 27 achieved this remarkable milestone, suggesting that this treatment may offer significant hope for many patients suffering from this aggressive cancer.

Event-Free Survival Correlation

Subgroup analyses provided further insights, indicating that all patients who met the twelve-month Event Free Survival (EFS) benchmark also achieved overall survival at the two-year mark. In contrast, only 59% of those who did not meet the EFS criterion reached two-year survival.

Expert Commentary on the Study

Dr. Peter Anderson, a pediatric oncologist at Cleveland Clinic Children’s, expressed optimism regarding the outcomes, stating that the data from the OST-HER2 trial is not only encouraging but also illustrates that the treatment was safe and well tolerated by the patient cohort.

Future Plans for Regulatory Approval

Dr. Robert Petit, Chief Medical & Scientific Officer at OS Therapies, shared insights into the company’s future plans. He indicated that they anticipate gathering additional data by November 2025, aligning with their objectives to engage regulatory authorities in discussions about the potential for conditional marketing authorization. This includes plans to file applications for various regulatory approvals, with timelines extending into early 2026.

Collaboration with Regulatory Authorities

During recent meetings, OS Therapies has successfully aligned with the Dutch Rapporteur around key factors pertinent to their ongoing clinical trials, encompassing discussions on safety and requisite manufacturing controls to bolster their case for OST-HER2’s approval.

Current Status and Market Reaction

As for the market performance, shares of OS Therapies were slightly down at $2.02, reflecting a minor fluctuation as traders reacted to the recent data release.

Frequently Asked Questions

What is OST-HER2?

OST-HER2 is an off-the-shelf immunotherapy developed by OS Therapies targeting osteosarcoma, a severe type of bone cancer.

What were the two-year survival results?

The trial indicated a 75% overall survival rate among treated patients, significantly higher than historical controls.

What does Event-Free Survival mean?

Event-Free Survival (EFS) refers to the duration during and after treatment where a patient remains cancer-free.

When are the expected regulatory filings?

OS Therapies aims to file for regulatory approvals beginning in December 2025, with several applications planned throughout early 2026.

How is the treatment being received by patients?

Feedback has been positive, with experts noting that the treatment is safe and well-tolerated based on trial data.

About The Author

Hello, I'm 30-year-old financial writer and expert Addison Perry, and I love to simplify the intricacies of the financial industry. I've committed myself over the years to deciphering the subtleties of investing techniques and economic trends and converting them into doable guidance that anybody can use. My goal with writings and books is to make money interesting and approachable so that readers may take charge of their financial futures.

My enthusiasm to empowerment and education has propelled me through my career in finance. I write because I think that everyone should be able to make educated financial decisions, and I try to provide that. Regardless of experience level with investing, my work is intended to provide insightful analysis and practical advice to enable you to thrive in the always changing financial environment. I appreciate you traveling with me toward success and financial literacy.

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