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BNT323/DB-1303

Phase 3

Endometrial Cancer | Small molecule | Oncology |BioNTech SE|Last Updated: Sep 1, 2026

Target and mechanism

Molecular targetHER2
Target classProtein
ModalitySmall molecule

Also known as BNT323

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment480

FDA Designations

BREAKTHROUGH_THERAPYFAST_TRACK

Clinical trial landscape

BNT323/DB-1303 · 1 trial · 1 indication

Phase 3 1
NCT06340568A Clinical Study of the Anti-cancer Effects of an Investigational Therapy or Chemotherapy in Patients With Recurring Uterine CancerEndometrial Cancer
RECRUITING480 Analytics
PHASE3RECRUITING
A Clinical Study of the Anti-cancer Effects of an Investigational Therapy or Chemotherapy in Patients With Recurring Uterine Cancer
Endometrial CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Cohort 1: PFS assessed by blinded independent central review (BICR) in participants with HER2 IHC 1+/2+ recurrent endometrial cancer
Up to approximately 53 months

By treatment arm. Defined as the time from randomization to the first objective tumor progression (per RECIST v1.1) or death from any cause, whichever occurs first.

Cohort 2: ORR assessed by BICR in participants with HER2 IHC 3+ recurrent endometrial cancer
Up to approximately 53 months

Defined as the proportion of participants with a CR or PR (per RECIST v1.1) as best overall response with confirmation.

Secondary Endpoints

Cohort 1: Overall survival (OS) in participants with HER2 IHC 1+/2+ recurrent endometrial cancer
Up to approximately 53 months
Cohort 1: PFS assessed by the investigator in participants with HER2 IHC 1+/2+ recurrent endometrial cancer
Up to approximately 53 months
Cohort 1: ORR assessed by BICR in participants with HER2 IHC 1+/2+ recurrent endometrial cancer
Up to approximately 53 months
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Cohort 1 (HER2 IHC score 1+ or 2+): BNT323/DB-1303EXPERIMENTAL -
Cohort 1 - Doxorubicin or paclitaxel (or docetaxel)ACTIVE_COMPARATORSingle agent chemotherapy (either doxorubicin or paclitaxel) per investigator's choice. Participants with contraindications to paclitaxel may receive docetaxel as an alternative (if available at the site).
Cohort 2 (HER2 IHC score 3+) - BNT323/DB-1303EXPERIMENTAL -

Interventions

NameTypeDescription
BNT323/DB-1303DRUGintravenous (IV) infusion
DoxorubicinDRUGIV bolus or infusion
PaclitaxelDRUGIV infusion
DocetaxelDRUGIV infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexFEMALE
Healthy VolunteersNo
Study Sites181

Key Inclusion Criteria: * Are female adults (defined as ≥18 years of age or acceptable age according to local regulations at the time of voluntarily giving informed consent). * Have histologically confirmed endometrial cancer that: * Is recurrent, * Has a HER2 IHC score of 1+, 2+ (Cohort 1), o...

Countries:United StatesArgentinaAustraliaBelgiumBrazilCanadaChinaCzechiaDenmarkFinlandFranceGreeceHungaryIsraelItalyNetherlandsNorwayPolandSingaporeSouth KoreaSpainSwedenTaiwanTurkey (Türkiye)United Kingdom
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Recent Changes (Last 90 Days)

LOWSep 1, 2026NCT06340568lastUpdatePostDate: changed
LOWSep 1, 2026NCT06340568lastUpdatePostDate: changed
LOWJul 21, 2026NCT06340568lastUpdatePostDate: changed
LOWJun 30, 2026NCT06340568lastUpdatePostDate: changed
LOWJun 30, 2026NCT06340568lastUpdatePostDate: changed
LOWJun 30, 2026NCT06340568lastUpdatePostDate: changed

Frequently asked questions about BNT323/DB-1303

What is BNT323 used for?

BNT323 is an investigational oncology therapy being studied for endometrial cancer and locally advanced breast cancer. It is also known as BNT323/DB-1303 and is being developed by BioNTech SE (BNTX). The drug is currently in clinical development and has not been approved by the FDA.

What does BNT323 target?

BNT323 targets HER2, a protein found on the surface of some cancer cells. By targeting HER2, the drug is designed to interfere with cancer cell growth and survival. This mechanism is being evaluated in clinical trials for HER2-expressing cancers, including endometrial and breast cancers.

Who makes BNT323?

BNT323 is being developed by BioNTech SE, a biotechnology company traded on the Nasdaq under the ticker BNTX. BioNTech is conducting clinical trials to evaluate the safety and efficacy of BNT323 in patients with certain types of cancer.

What phase is BNT323 in?

BNT323 is in Phase 1 clinical development, with an active Phase 1 trial recruiting patients. The drug has received Breakthrough Therapy and Fast Track designations from the FDA, reflecting its potential to address serious conditions. It remains investigational and is not yet approved.

What clinical trials is BNT323 in?

BNT323 is being studied in two clinical trials. NCT06340568 is a Phase 3 trial in endometrial cancer with 480 participants, and NCT06827236 is a Phase 1 trial in advanced breast cancer with 380 participants. Both trials are currently recruiting patients.

Is BNT323 the same as BNT323/DB-1303?

Yes, BNT323 is also known as BNT323/DB-1303. The drug is referred to by this alternative name in some clinical and research contexts. Both names refer to the same investigational therapy being developed by BioNTech SE.