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Emi-Le

Phase 1

Triple Negative Breast Cancer | Small molecule | Oncology |Day One Biopharmaceuticals, Inc.|Trials Updated: Jun 29, 2026

Emi-Le development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since May 2022

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDBiomarker
Total Trials1
Total Enrollment360

FDA Designations

No designations recorded

Emi-Le clinical trials

Emi-Le · 1 trial · 7 indications

Phase 1 1
NCT05377996A Study of Emiltatug Ledadotin (Emi-Le) in Participants With Solid TumorsTriple Negative Breast Cancer
RECRUITING360 Analytics
PHASE1RECRUITING
A Study of Emiltatug Ledadotin (Emi-Le) in Participants With Solid Tumors
Triple Negative Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Frequency of adverse events that are considered dose-limiting toxicities (DLTs) and associated with Emi-Le during the first cycle of treatment (Dose Escalation)
17 months

Determine the maximum tolerated dose (MTD) and recommended Phase 2 dose (RP2D) of Emi-Le

Incidence of adverse events (Dose Escalation and Dose Expansion)
3 years

Assess the safety and tolerability of Emi-Le by determining the number of patients with adverse events from date of first dose to 60 days post last dose

Objective Response Rate (ORR) (Dose Expansion and EMBLEM-1)
approximately 3 years

The percentage of patients with a best overall response of complete or partial response as assessed by the investigator per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1

Secondary Endpoints

Objective Response Rate (ORR) (Dose Escalation)
Up to approximately 3 years
Duration of response (DOR) (Dose Escalation, Dose Expansion, and EMBLEM-1)
Up to approximately 3 years
Maximum observed plasma concentration of Emi-Le and payload (Cmax) (Dose Escalation and Dose Expansion)
Up to approximately 3 years
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Emi-LeEXPERIMENTALSingle arm Emi-Le alone (monotherapy)

Interventions

NameTypeDescription
Emi-LeDRUGEmi-Le will be administered through a vein in your arm or port catheter (intravenously)
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites26

Inclusion Criteria: * Recurrent or advanced solid tumor and has disease * Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1 * Participants in DES must have at least one measurable disease (target) lesion as defined by RECIST version 1.1. * Tumor tissue, either archival or from a f...

Countries:United States
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Frequently asked questions about Emi-Le

What is Emi-Le used for?

Emi-Le is an investigational small molecule being studied for the treatment of triple negative breast cancer and other solid tumors. It is also being evaluated in breast cancer, endometrial cancer, ovarian cancer, fallopian tube cancer, primary peritoneal cavity cancer, and adenoid cystic carcinoma. It is not yet approved for any indication.

Who is developing Emi-Le?

Emi-Le is being developed by Day One Biopharmaceuticals, Inc., which trades under the ticker DAWN. The company is the sponsor of the clinical program evaluating Emi-Le in solid tumors, including triple negative breast cancer.

What phase is Emi-Le in?

Emi-Le is in Phase 1 clinical development. It is an investigational therapy and has not been approved by the FDA. The Phase 1 program is currently recruiting participants and is designed to evaluate Emi-Le in patients with solid tumors, including triple negative breast cancer.

What clinical trial is Emi-Le in?

Emi-Le is being studied in the Phase 1 trial NCT05377996, titled A Study of Emiltatug Ledadotin (Emi-Le) in Participants With Solid Tumors. The trial is recruiting, has an estimated enrollment of 360 participants, and is being conducted in the United States in adults aged 18 years and older.

Is Emi-Le the same as emiltatug ledadotin?

Yes, Emi-Le is the short name for emiltatug ledadotin. The Phase 1 trial NCT05377996 refers to the agent as emiltatug ledadotin (Emi-Le), so both names identify the same investigational small molecule being developed by Day One Biopharmaceuticals.

Is Emi-Le biomarker selected?

Yes, the Emi-Le Phase 1 trial NCT05377996 is biomarker selected, meaning enrollment is guided by a biomarker. The study is an uncontrolled, open-label Phase 1 trial recruiting adults with solid tumors, including triple negative breast cancer, across sites in the United States.