NCT06752681 · Day One Biopharmaceuticals, Inc.
To Evaluate the Safety, Tolerability, Pharmacokinetics and Antitumor Activity of DAY301 in Participants With Locally Advanced or Metastatic Solid Tumors
What this study is about
This is a Phase 1a/1b, where both patients and doctors know the treatment given, gradually increasing doses and expansion study to evaluate the safety and anti-tumor activity of DAY301, a PTK7-directed antibody-drug conjugate in participants with advanced or metastatic solid tumors.
View original scientific description
This is a Phase 1a/1b, open-label, dose escalation and expansion study to evaluate the safety and anti-tumor activity of DAY301, a PTK7-directed antibody-drug conjugate in participants with advanced or metastatic solid tumors. The study comprises of 2 phases: Phase 1a dose escalation where participants will be administered DAY301 at escalating dose levels to assess safety and tolerability, and to determine the maximum tolerated dose (MTD) and/or the recommended dose (RD); In Phase 1b dose expansion, DAY301 will be evaluated in dose expansion cohorts.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
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 squamous cell carcinoma
- Gastric/gastroesophageal junction adenocarcinoma
- Cervical squamous cell carcinoma
- Endometrial cancers (Participants must have been previously treated with standard of care systemic therapy, or for whom no standard therapy is available).
- Availability of tumor tissue sample (either an archival specimen or a fresh biopsy) at screening
- Measurable disease per Response Evaluation Criteria in Solid Tumors, Version 1.1 (RECIST v1.1).
- Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1.
- Adequate organ function.
Exclusion criteria
- Prior use of PTK7 targeting treatment (Phase 1a) or prior use of PTK7 targeting treatments and/or topoisomerase 1 (TOP1) inhibitor-based antibody-drug conjugate (ADC) (Phase 1b).
- Phase 1b disease-specific exclusion criteria:
- Cohort 1: Neuroendocrine tumors or endometrial sarcoma (eg, stromal sarcoma, leiomyosarcoma, or other types of pure sarcomas)
- Cohort 2: Ovarian cancer that progressed \>6 months after the last dose of platinum-based chemotherapy (platinum-sensitive disease), or disease that did not respond (partial response \[PR\] or complete response \[CR\]) to or progressed ≤91 days after the last dose of first-line platinum-based chemotherapy (primary platinum-refractory disease)
- Cohort 3: nasopharyngeal primary tumors.
- History of small bowel obstruction requiring hospitalization within 3 months prior to the first dose of study treatment.
- Ascites requiring frequent paracentesis (more often than approximately every 4 weeks) for symptomatic management, or new onset within 4 weeks prior to the first dose of study treatment. Patients with an indwelling catheter may be considered eligible, after consultation with the medical monitor.
- Active or progressing brain metastases or evidence of leptomeningeal disease.
- Persistent toxicities from previous systemic antineoplastic treatments of Grade \>1, excluding alopecia and vitiligo.
- Systemic antineoplastic therapy within five half-lives or 4 weeks, whichever is shorter, prior to first dose of study treatment, including investigational agents. Note: Other protocol defined Inclusion/Exclusion criteria may apply.
Where
- New Haven, Connecticut
- Lake Mary, Florida
- Sarasota, Florida
- Indianapolis, Indiana
- Grand Rapids, Michigan
- New York, New York
- Oklahoma City, Oklahoma
- Nashville, Tennessee
- Houston, Texas
- San Antonio, Texas
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Oct 10, 2025 · Source of record for eligibility and locations