BioNTech breast cancer trial meets main goal
The overall-survival analysis remained immature, and the companies said available data suggest potential patient benefit would be limited.
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.
Form Type
6-K
Rhea-AI Filing Summary
BioNTech SE and DualityBiologics (Suzhou) Co., Ltd. announced that the global Phase 3 DYNASTY-Breast02 trial met its primary endpoint, with a statistically significant but modest improvement in progression-free survival (PFS) for trastuzumab pamirtecan versus investigator’s choice of chemotherapy in chemotherapy-naïve patients with HR+/HER2-low metastatic breast cancer whose disease progressed on endocrine therapy.
At the interim analysis, overall-survival (OS) data were not mature. The release reported a higher rate of interstitial lung disease (ILD) than in prior trials; most cases were Grade 1 or 2, and Grade 3–5 severe and fatal events were reported in a small proportion of patients. BioNTech and DualityBio said available efficacy and safety data suggest potential patient benefit would be limited in the treatment landscape, and said they will discuss the data and determine next steps.
0 points · 0 major1 major · 3 points
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.
Hollow bars mark forward-looking points. How the balance works
Positive
- None.
Negative
- Major point. Forward-looking: it has not happened yet and may not happen.Modest PFS improvement; potential patient benefit described as limited.
- Moderate pointThe release reported a higher ILD rate than in prior trastuzumab pamirtecan trials.
- Minor pointGrade 3–5 severe and fatal events were reported in a small proportion of patients.
Filing Explained
Although the companies say they will determine next steps for DYNASTY-Breast02, trastuzumab pamirtecan remains under evaluation in an ongoing global Phase 3 trial for HER2-expressing recurrent endometrial cancer and a global Phase 1/2 trial for advanced or metastatic solid tumors.
Key Figures
DYNASTY-Breast02 participants: 541 patients
Randomization: 1:1
Ongoing clinical trials: 3 trials
+1 more
4 metrics
DYNASTY-Breast02 participants
541 patients
Patients with HER2-low expression were randomized in the trial.
Randomization
1:1
Trastuzumab pamirtecan or investigator’s choice of single-agent chemotherapy.
Ongoing clinical trials
3 trials
Trastuzumab pamirtecan development.
Global Phase 3 trials
2 trials
Included among the ongoing trastuzumab pamirtecan clinical trials.
Key Terms
progression-free survival (PFS), overall survival (OS), interstitial lung disease (ILD), antibody-drug conjugates (ADCs)
4 terms
progression-free survival (PFS) medical
"improvement in progression-free survival (“PFS”)"
Progression-free survival (PFS) measures the length of time in a clinical trial or treatment period during which a patient’s disease does not get worse. Investors watch PFS because longer PFS in trials can signal a drug’s effectiveness, influence regulatory approval and reimbursement decisions, and affect commercial value—think of it as how long a product keeps a problem from returning, which helps estimate future sales and competitive advantage.
overall survival (OS) medical
"secondary endpoint of overall survival (“OS”)"
Overall survival (OS) is the length of time from the start of a treatment or clinical study until death from any cause, essentially measuring how long patients live after a therapy begins. Investors watch OS because it is the most direct evidence a treatment extends life; stronger OS results can drive regulatory approvals, wider use and higher revenue expectations, much like sales figures proving a product actually works.
interstitial lung disease (ILD) medical
"higher rate of interstitial lung disease (“ILD”)"
A group of lung conditions that cause progressive scarring and stiffening of the tissue that transfers oxygen into the blood, making breathing harder over time. Investors should care because interstitial lung disease can drive clinical trial design, safety concerns, regulatory scrutiny, long-term treatment markets, and potential liability exposure for drug developers and device makers—think of it as damage to a sponge that reduces its ability to soak up air.
antibody-drug conjugates (ADCs) medical
"next-generation antibody-drug conjugates (ADCs)"
Antibody-drug conjugates (ADCs) are advanced medicines that combine a targeted antibody with a powerful drug, acting like a guided missile to deliver treatment directly to cancer cells while sparing healthy tissue. This precision approach can improve effectiveness and reduce side effects, making ADCs a promising area of biotech innovation. For investors, advancements in ADC technology can signal potential growth opportunities in the pharmaceutical and healthcare sectors.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
Who was eligible for the BNTX DYNASTY-Breast02 trial?
The trial enrolled patients whose disease had progressed on at least two lines of prior hormone therapy or within six months of first-line hormone therapy plus a CDK4/6 inhibitor in the metastatic setting. It was a randomized, multicenter, open-label trial.
AI-generated analysis. How Rhea-AI works. Not financial advice.
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
UNDER THE SECURITIES EXCHANGE ACT OF 1934
FOR THE MONTH OF OCTOBER 2026
COMMISSION FILE NUMBER 001-39081
BioNTech SE
(Translation of registrant’s name into English)
(Translation of registrant’s name into English)
An der Goldgrube 12
D-55131 Mainz
Germany
+49 6131-9084-0
(Address of principal executive offices)
(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 ☐
Indicate by check mark if the registrant is submitting the Form 6‑K in paper as permitted by Regulation S‑T Rule 101(b)(1): ☐
Indicate by check mark if the registrant is submitting the Form 6‑K in paper as permitted by Regulation S‑T Rule 101(b)(7): ☐
DOCUMENTS INCLUDED AS PART OF THIS FORM 6-K
On October 26, 2026, BioNTech SE (Nasdaq: BNTX, “BioNTech”) and DualityBiologics (Suzhou) Co., Ltd. (“DualityBio”, HKEX: 9606.HK) announced topline results of the DYNASTY-Breast02 global Phase 3 clinical trial evaluating trastuzumab pamirtecan in HR+/HER2-low metastatic breast cancer. The press release is attached as Exhibit 99.1.
SIGNATURE
Pursuant to the requirements of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
BioNTech SE | ||||||||||||||
By: | /s/ Ramon Zapata-Gomez | By: | /s/ Dr. Sierk Poetting | |||||||||||
Name: Ramon Zapata-Gomez | Name: Dr. Sierk Poetting | |||||||||||||
Title: Chief Financial Officer | Title: Chief Operating Officer | |||||||||||||
Date: October 26, 2026
EXHIBIT INDEX
Exhibit | Description of Exhibit | ||||
99.1 | BioNTech and DualityBio Announce Topline Results of the DYNASTY-Breast02 Global Phase 3 Clinical Trial Evaluating Trastuzumab Pamirtecan in HR+/HER2-low Metastatic Breast Cancer | ||||
Exhibit 99.1
BioNTech and DualityBio Announce Topline Results of the DYNASTY-Breast02 Global Phase 3 Clinical Trial Evaluating Trastuzumab Pamirtecan in HR+/HER2-low Metastatic Breast Cancer
MAINZ, Germany and SHANGHAI, China, October 26, 2026 – BioNTech SE (Nasdaq: BNTX, “BioNTech”) and DualityBiologics (Suzhou) Co., Ltd. (“DualityBio”, HKEX: 9606.HK) announced today that the DYNASTY-Breast02 global Phase 3 clinical trial (NCT06018337) met its primary endpoint demonstrating a statistically significant, yet modest improvement in progression-free survival (“PFS”) with trastuzumab pamirtecan (BNT323/DB-1303) compared to investigator’s choice of chemotherapy in chemotherapy-naïve patients with HR+/HER2-low metastatic breast cancer who have progressed on endocrine therapy. At this interim analysis for the secondary endpoint of overall survival (“OS”), data were not mature.
A higher rate of interstitial lung disease (“ILD”) was reported in this trial compared to prior trials with trastuzumab pamirtecan, with most cases being Grade 1 and 2. Severe and fatal events were reported in a small proportion of patients (Grade 3-5). Otherwise, the overall safety profile was consistent with prior clinical trials and no new safety signals were observed.
The available efficacy and safety data, as of this data cut-off date, suggest that the potential benefit to patients would be limited in the context of the HR+/HER2-low metastatic breast cancer treatment landscape. The companies will discuss the data and determine next steps.
BioNTech and DualityBio are developing trastuzumab pamirtecan in three ongoing clinical trials, including two global Phase 3 clinical trials, in HR+/HER2-low metastatic breast cancer (NCT06018337) and in HER2-expressing recurrent endometrial cancer (NCT06340568), as well as in a global Phase 1/2 clinical trial (NCT05150691) in patients with advanced/metastatic solid tumors.
About DYNASTY-Breast02
DYNASTY-Breast02 is a global Phase 3 randomized, multi-center, open-label clinical trial in patients living with HR+/HER2-low metastatic breast cancer whose disease has progressed on at least two lines of prior hormone therapy or within six months of first line hormone therapy plus cyclin-dependent kinase (CDK) 4/6 inhibitor in the metastatic setting. The primary endpoint of the clinical trial is PFS with a key secondary endpoint of OS. In the trial, 541 patients with HER2-low expression (IHC 2+/ISH- and IHC 1+) were randomized 1:1 to receive either trastuzumab pamirtecan or investigator's choice single-agent chemotherapy (capecitabine, paclitaxel or nab-paclitaxel).
About trastuzumab pamirtecan
Trastuzumab pamirtecan (BNT323/DB-1303) is a third-generation topoisomerase-1 inhibitor-based ADC targeting HER2 being developed by BioNTech and Duality Biologics. Trastuzumab pamirtecan was built from DualityBio’s proprietary Duality Immune Toxin Antibody Conjugates (“DITAC”) platform. HER2 is a surface-expressed protein on solid tumors and has been linked to the aggressive growth and spread of cancer cells.
Trastuzumab pamirtecan is being evaluated in an ongoing Phase 1/2 trial (NCT05150691) in patients with advanced/metastatic solid tumors, in Fern-EC-01, a randomized Phase 3 clinical trial (NCT06340568) evaluating trastuzumab pamirtecan compared with investigator's choice of single agent chemotherapy in previously treated patients with HER2-expressing advanced recurrent endometrial cancer, and in DYNASTY-Breast02, a randomized Phase 3 clinical trial (NCT06018337) in chemotherapy-naïve patients with HR+/HER2-low metastatic breast cancer who have progressed on endocrine therapy.
About BioNTech
BioNTech is a global next generation biopharmaceutical company pioneering novel investigative therapies for cancer and other serious diseases. In oncology, BioNTech is committed to transforming how cancer is treated. Its ambition is to develop innovative medicines with pan-tumor or synergistic potential to address cancer from multiple angles and across the full continuum of the disease from early- to late-stage. Its growing late-stage oncology pipeline comprises complementary treatment approaches spanning immunomodulators, antibody-drug conjugates, and mRNA cancer immunotherapies. BioNTech has partnered with multiple global and specialized pharmaceutical collaborators leveraging complementary expertise and resources to accelerate innovation and drive progress, including Bristol Myers Squibb, Duality Biologics, Genentech, a member of the Roche Group, Genmab, MediLink, OncoC4, and Pfizer.
For more information, please visit www.BioNTech.com.
BioNTech Forward-Looking Statements
This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including, but not limited to, statements concerning: the collaboration between BioNTech and DualityBio to jointly clinically develop antibody-drug conjugates (ADCs) including trastuzumab pamirtecan (BNT323/DB-1303); the initiation, timing, progress, and results of BioNTech’s research and development programs, including data from the DYNASTY-Breast02 Phase 3 clinical trial (NCT06018337) evaluating trastuzumab pamirtecan in HR+/HER2-low metastatic breast cancer; the expected timing of initiation, enrollment, and completion of trials and related preparatory work and the availability of results; and discussions with regulatory agencies. In some cases, forward-looking statements can be identified by terminology such as “will,” “may,” “should,” “expects,” “intends,” “plans,” “aims,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue,” or the negative of these terms or other comparable terminology, although not all forward-looking statements contain these words.
The forward-looking statements in this press release are based on BioNTech’s current expectations and beliefs of future events and are neither promises nor guarantees. You should not place undue reliance on these forward-looking statements because they involve known and unknown risks, uncertainties, and other factors, many of which are beyond BioNTech’s control, and which could cause actual results to differ materially and adversely from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to: the uncertainties inherent in research and development, including the ability to meet anticipated clinical endpoints, commencement and/or completion dates for clinical trials, regulatory submission dates, regulatory approval dates and/or launch dates, as well as risks associated with clinical data, and including the possibility of unfavorable new preclinical, clinical or safety data and further analyses of existing preclinical, clinical or safety data; the nature of clinical data, which is subject to ongoing peer review, regulatory review and market interpretation; the impact of tariffs and escalations in trade policy; competition related to BioNTech’s product candidates; the timing of and BioNTech’s ability to obtain and maintain regulatory approval for its product candidates; BioNTech’s ability to identify research opportunities and discover and develop investigational medicines; the ability and willingness of BioNTech’s third-party collaborators to continue research and development activities relating to BioNTech’s development candidates and investigational medicines; unforeseen safety issues and potential claims that are alleged to arise from the use of products and product candidates developed or manufactured by BioNTech; BioNTech’s and its collaborators’ ability to commercialize and market its product candidates, if approved; BioNTech’s ability to manage its development and related expenses; regulatory and political developments in the United States and other countries; BioNTech’s ability to effectively scale its production capabilities and manufacture its products and product candidates; and other factors not known to BioNTech at this time.
You should review the risks and uncertainties described under the heading “Risk Factors” in BioNTech’s Report on Form 6-K for the period ended June 30, 2026, and in subsequent filings made by BioNTech with the SEC, which are available on the SEC’s website at www.sec.gov.These forward-looking statements speak only as of the date hereof. Except as required by law, BioNTech disclaims any intention or responsibility for updating or revising any forward-looking statements contained in this press release in the event of new information, future developments or otherwise.
About DualityBio
DualityBio is a clinical-stage innovative biopharmaceutical company dedicated to developing next-generation antibody-drug conjugates (ADCs) for patients with cancer and autoimmune diseases. The Company has successfully built multiple next-generation ADC technology platforms with global intellectual property rights. Grounded in a deep understanding of disease biology, DualityBio has established a robust clinical-stage ADC pipeline and is conducting multiple global, multicenter clinical trials across nearly 20 countries, with over 3,500 patients enrolled to date. Furthermore, DualityBio has entered into several out-licensing collaborations with global pharmaceutical companies and leading innovative biotech firms. Serving as a global engine for ADC innovation, DualityBio continues to develop next-generation novel ADCs, including bispecific ADCs, ADCs with novel payloads, and autoimmune ADCs.
For more information, please visit www.dualitybiologics.com.
CONTACTS
BioNTech
Media Relations
Jasmina Alatovic
Media@biontech.de
Investor Relations
Douglas Maffei, PhD
Investors@biontech.de
DualityBio
Media Relations
PR@dualitybiologics.com
Investor Relations
IR@dualitybiologics.com