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DAY301

Phase 1

Advanced or Metastatic Solid Tumors | Small molecule | Oncology |Day One Biopharmaceuticals, Inc.|Trials Updated: Jul 22, 2026

DAY301 development status

Highest phase Phase 1
Registered trials 1 across 1 sponsor since Dec 2024

DAY301 target and mechanism

Molecular targetPTK7
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

UNCONTROLLEDBiomarker
Total Trials1
Total Enrollment300

FDA Designations

No designations recorded

DAY301 clinical trials

DAY301 · 1 trial · 1 indication

Phase 1 1
NCT06752681To Evaluate the Safety, Tolerability, Pharmacokinetics and Antitumor Activity of DAY301 in Participants With Locally Advanced or Metastatic Solid TumorsAdvanced or Metastatic Solid Tumors
RECRUITING300 Analytics
PHASE1RECRUITING
To Evaluate the Safety, Tolerability, Pharmacokinetics and Antitumor Activity of DAY301 in Participants With Locally Advanced or Metastatic Solid Tumors
Advanced or Metastatic Solid TumorsUnlock trial analytics

Study Endpoints

Primary Endpoints

Phase 1a: Dose Escalation: Number of participants with reported Dose Limiting Toxicities (DLTs)
Within 21 days of first infusion (Day 1)

To evaluate adverse events (AEs) considered dose limiting toxicities that occur in the first cycle of treatment (within a DLT observation period).

Phase 1a: Dose Escalation: Number of participants with reported adverse events (AEs) and serious AEs (SAEs)
through the duration of treatment, up to approximately 12 months

The type, incidence, and severity of AEs and SAEs will be determined using the National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events (CTCAE) v5.0.

Phase 1a: Dose Escalation: Frequency of dose interruptions
through the duration of treatment, up to approximately 12 months

The frequency at which dose interruptions occur during dose-escalation

Phase 1a: Dose Escalation: Duration of dose interruptions
through the duration of treatment, up to approximately 12 months

The duration of dose interruptions that occur during dose-escalation.

Phase 1a: Dose Escalation: Frequency of dose reductions
through the duration of treatment, up to approximately 12 months

The frequency at which dose reductions occur during dose-escalation.

Phase 1a: Dose Escalation: Duration of dose reductions
through the duration of treatment, up to approximately 12 months

The duration of dose reductions that occur during dose-escalation.

Phase 1b: Dose Expansion: Objective response rate
through the duration of treatment, up to approximately 12 months

Objective response rate based on best overall response (BOR) will be assessed by investigators according to Response Evaluation Criteria in Solid Tumors (RECIST v1.1).

Phase 1b: Dose Expansion: Number of participants reporting AEs and SAEs
through the duration of treatment, up to approximately 12 months

The type, incidence, and severity of AEs and SAEs will be determined using the NCI CTCAE v5.0.

Phase 1b: Dose Expansion: Frequency of dose interruptions
through the duration of treatment, up to approximately 12 months

The frequency at which dose interruptions occur during dose-expansion.

Phase 1b: Dose Expansion: Duration of dose interruption
through the duration of treatment, up to approximately 12 months

The duration of dose interruptions that occur during dose-expansion.

Phase 1b: Dose Expansion: Frequency of dose reductions
through the duration of treatment, up to approximately 12 months

The frequency at which dose reductions occur during dose-expansion.

Phase 1b: Dose Expansion: Duration of dose reductions
through the duration of treatment, up to approximately 12 months

The duration of dose reductions that occur during dose-expansion.

Secondary Endpoints

Phase 1a and Phase 1b: Maximum concentration (Cmax) of DAY301
Varying timepoints through the duration of treatment, up to approximately 12 months
Phase 1a and Phase 1b: time to Cmax (Tmax) of DAY301
Varying timepoints through the duration of treatment, up to approximately 12 months
Phase 1a and Phase 1b: area under the curve (AUC) of DAY301
Varying timepoints through the duration of treatment, up to approximately 12 months
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSINGLE_GROUP
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
DAY301 intravenous (IV) infusionEXPERIMENTALDAY301 will be administered at different dose levels in dose escalation and at the RD in dose expansion cohorts.

Interventions

NameTypeDescription
DAY301DRUGDAY301 will be administered as IV infusion
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites11

Inclusion Criteria: * Histologically or cytologically confirmed diagnosis of advanced or metastatic solid tumors of the following histologies: * Ovarian cancer * Esophageal squamous cell carcinoma * Triple-negative breast cancer * Non-small cell lung cancer * Small cell lung cancer * Head and neck ...

Countries:United StatesCanada
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Competitive Landscape -Other Solid Tumors 10 trials (matched to "Advanced or Metastatic Solid Tumors")

Frequently asked questions about DAY301

What is DAY301?

DAY301 is an investigational small molecule being developed by Day One Biopharmaceuticals for the treatment of locally advanced or metastatic solid tumors. It is in Phase 1 clinical development and is designed to target PTK7, a protein target. It has not been established as a marketed therapy.

What is DAY301 used for in advanced or metastatic solid tumors?

DAY301 is being studied for use in adults with locally advanced or metastatic solid tumors. The Phase 1 trial enrolls participants 18 years and older and evaluates safety, tolerability, pharmacokinetics, and antitumor activity. Its use in this setting remains investigational and is available only through clinical research.

What does DAY301 target?

DAY301 targets PTK7, a protein target. PTK7 is the molecular target named for this small molecule, and the Phase 1 program is biomarker selected, meaning trial enrollment is guided by biomarker criteria. The trial is designed to assess how the drug behaves in participants whose tumors meet those criteria.

Who is developing DAY301?

DAY301 is being developed by Day One Biopharmaceuticals, Inc., which trades under the ticker DAWN. The company is the sponsor of the Phase 1 study evaluating the drug in locally advanced or metastatic solid tumors in the United States and Canada.

What phase is DAY301 in?

DAY301 is in Phase 1 clinical development. It is investigational and has not been approved by the FDA. The single Phase 1 trial is currently recruiting, with a planned enrollment of 300 participants and no completed trials reported for the program.

What clinical trial is DAY301 in?

DAY301 is being evaluated in trial NCT06752681, titled a study of the safety, tolerability, pharmacokinetics, and antitumor activity of DAY301 in participants with locally advanced or metastatic solid tumors. The Phase 1 trial is recruiting, is uncontrolled, is not randomized or double blind, and plans to enroll 300 participants across the United States and Canada.