Clinical trial Recruiting at 4 sites Phase 1 Interventional Ages 18 and up

CS5007 in people with advanced solid tumors

Official title: A Phase I, Dose-Escalation and Dose-Expansion Study to Evaluate the Safety, Tolerability, Pharmacokinetics, and Anti Tumor Activities of CS5007, a Novel EGFR and HER3 Bispecific Antibody-Drug Conjugate, in Participants With Advanced Solid Tumors

Run by CStone Pharmaceuticals · NCT07622524 · Data updated 2026-11-12

This first-in-human study tests CS5007 as a single treatment to see if it is safe and tolerable in adults with unresectable advanced solid tumors and a measurable lesion.

Quick facts

PhasePhase 1
Study typeInterventional
Ages18 Years and up
SexAll
Enrollment310 (estimated)
SponsorCStone Pharmaceuticals
Industry-sponsored
Locations7 sites (Darlinghurst, New South Wales and 6 other locations)
StatusRecruiting
StartedJuly 16, 2026
Main results expectedJanuary 2028
Study endsJanuary 2029
Registry record updatedAugust 14, 2026
Trial IDNCT07622524 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults (≥18) with unresectable advanced solid tumors, at least one measurable lesion, ECOG 0-1, adequate organ function, and consent to participate.

Probably not a fit

Patients without measurable disease changes, intolerable safety issues, or where CS5007 does not reach therapeutic exposure may not benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is an open-label, multicenter Phase I trial of CS5007 given as monotherapy to adults with unresectable advanced solid tumors. The study uses a Phase Ia dose-escalation to identify a safe dose, followed by a Phase Ib dose-expansion to look for early signs of anti-tumor activity. Primary aims include safety, tolerability, and pharmacokinetics, with preliminary assessment of efficacy. Eligibility requires measurable disease, good performance status, adequate organ function, and life expectancy of at least three months. The trial is sponsored by CStone Pharmaceuticals with sites in Australia.

Why it matters

Potential benefit: If successful, CS5007 could establish a safe dose and show early activity signals that justify further development for solid tumors.

How similar studies have gone: Phase I studies of similar bispecific antibody-drug conjugates have shown manageable safety and preliminary activity in advanced tumors, though CS5007 is being tested in a first-in-human setting.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Evidence of a personally signed and dated informed consent document.
* Willing and able to comply with scheduled visits, treatment plan, laboratory tests, and other study procedures.
* Being ≥ 18 years of age on the day of signing informed consent.
* Pathologically or cytologically confirmed, unresectable advanced solid tumors.
* Participants must have at least one measurable lesion according to RECIST Version1.1.
* Eastern Cooperative Oncology Group (ECOG) Performance Score of 0 or 1.
* Adequate organ function.
* Life expectancy ≥ 3 months.
* Fertile men and women of childbearing potential must agree to use an effective method of birth control from providing signed consent and for 180 days after the last study drug administration

Exclusion Criteria:

* Has disease that is suitable for local treatment administered with curative intent.
* Has a history of a second malignancy active within the previous 3 years except for locally curable cancers that have been apparently cured.
* Known primary central nervous system (CNS) tumor or solid tumor CNS metastasis that is symptomatic, untreated, or requires therapy.
* Has life-threatening bleeding event or severe bleeding within 3 months prior to first dose.
* Has uncontrolled pleural effusion, pericardial effusion, or ascites.
* Has immune deficient disease or received systemic immunosuppressive treatment.
* Has intestinal obstruction,or history of inflammatory bowel disease,or chronic diarrhea.
* Has history of (non-infectious) interstitial lung disease/pneumonitis that required steroids.
* Has active infections requiring systemic therapy.
* Has significant cardiovascular disease or cerebrovascular accident within specified timeframes prior to first dose.
* Insufficient washout from prior anti-tumor therapy.
* Received live vaccine within 28 days prior to first dose.
* History of allogeneic organ or hematopoietic stem cell transplantation.
* History of hypersensitivity to excipients of study drug or any monoclonal antibody.
* Any toxic effects of prior therapy unresolved to Grade ≤1.
* Active alcohol or drug abuse.
* Pregnant or breastfeeding women.
* Other acute or chronic medical or psychiatric conditions that may increase risk or interfere with study results, in the investigator's judgment.

Where it's running

  • Macquarie University
    North Ryde, New South Wales, Australia
    Recruiting
  • Calvary Mater Newcastle
    Waratah, New South Wales, Australia
    Recruiting
  • Icon Cancer Centre South Brisbane
    South Brisbane, Queensland, Australia
    Recruiting
  • Linear Clinical Research Ltd
    Nedlands, Western Australia, Australia
    Recruiting
  • St Vincent's Hospital Sydney
    Darlinghurst, New South Wales, Australia
    Not yet recruiting
  • St Vincent's Hospital Melbourne
    Fitzroy, Victoria, Australia
    Not yet recruiting
Show 1 more location
  • Shanghai Chest Hospital
    Shanghai, Shanghai Municipality, China
    Not yet recruiting

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.