Testing CBX-12 for women with hard-to-treat ovarian cancer

A Randomized Phase 2 Study of CBX 12 in Subjects With Platinum Resistant or Refractory Ovarian Cancer

PHASE2 · Cybrexa Therapeutics · NCT06315491

This study is testing a new drug called CBX-12 to see if it can help women with hard-to-treat ovarian cancer feel better when other treatments haven't worked.

Quick facts

PhasePHASE2
Study typeInterventional
Enrollment40 (estimated)
Ages18 Years and up
SexFemale
SponsorCybrexa Therapeutics (industry)
Drugs / interventionsbevacizumab, chemotherapy, radiation
Locations17 sites (Scottsdale, Arizona and 16 other locations)
Trial IDNCT06315491 on ClinicalTrials.gov

What this trial studies

This study evaluates the safety, tolerability, and efficacy of a drug called CBX-12 in women diagnosed with platinum-resistant or refractory ovarian cancer. Participants will receive either 125 mg/m2 or 100 mg/m2 of CBX-12 every 21 days. The study aims to determine how well the drug works in this specific patient population, which has limited treatment options due to resistance to platinum-based therapies.

Who should consider this trial

Good fit: Ideal candidates are women aged 18 and older with histologically or cytologically diagnosed high-grade serous ovarian cancer that is refractory to prior platinum-based therapies.

Not a fit: Patients who have not received prior platinum-based chemotherapy or those with non-serous ovarian cancer may not benefit from this study.

Why it matters

Potential benefit: If successful, this treatment could provide a new therapeutic option for women with platinum-resistant ovarian cancer.

How similar studies have performed: While there have been studies on various treatments for ovarian cancer, the specific approach with CBX-12 in this context is novel and has not been extensively tested.

Eligibility criteria

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Subjects must have histologically- or cytologically-diagnosed epithelial high-grade serous cancer of the ovary, fallopian tube cancer or primary peritoneum cancer that is refractory to prior therapy and must have platinum-resistant disease defined as:

  * Subjects who have received only 1 platinum-based chemotherapy regimen for at least 4 cycles of platinum must have disease progression on treatment or occurring ≤ 26 weeks after their last dose of platinum.
  * Patients who have progressed following a second course of a platinum based regimen.
  * Subjects may have up to 2 additional systemic regimens for advanced or metastatic disease. Maintenance regimens (e.g., with a PARP inhibitor or bevacizumab) are not considered separate regimens.
* Age greater than or equal to 18 years at the time of signing the informed consent form (ICF).
* Has measurable disease per RECIST 1.1.
* Has provided written informed consent.
* Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 or 1.
* Adequate liver, renal, hematologic, pulmonary and coagulation function.

Exclusion Criteria:

* Cytotoxic chemotherapy, biologic agent, investigational agent, or radiation therapy within 3 weeks prior to the first dose of CBX-12.
* Subjects who are currently receiving any other anticancer or investigational agent(s).
* Clinically significant intercurrent disease.
* Active human immunodeficiency virus (HIV) infection.
* Active hepatitis B or C infection.

Where this trial is running

Scottsdale, Arizona and 16 other locations

Study contacts

How to participate

  1. Review the eligibility criteria above with your treating physician.
  2. Visit the official trial page on ClinicalTrials.gov for the most current contact information and recruitment status.
  3. Contact the listed study coordinator or principal investigator to request pre-screening. Pre-screening is free and never obligates you to enroll.

View on ClinicalTrials.gov →

Conditions: Platinum-resistant Ovarian Cancer, Refractory Ovarian Carcinoma

Last reviewed 2026-05-15 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.