Clinical trial Recruiting at 1 site Interventional Ages 18 and up

Comparing methods to capture circulating tumor cells in metastatic breast or prostate cancer

Official title: Comparison of Different Methods of CAPTure of Circulating Tumour Cells (CTC) in Patients With Metastatic Breast or Prostate Cancer

Run by Institut Claudius Regaud · NCT06904625 · Data updated 2026-11-12

This one-day test will compare three blood-based methods (CellSearch®, Parsortix®, and SmartCatch®) to see which best finds circulating tumor cells in people with metastatic breast or prostate cancer before they start a new line of treatment.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment54 (estimated)
SponsorInstitut Claudius Regaud
Academic / other
Locations1 site (Toulouse)
StatusRecruiting
StartedAugust 14, 2025
Main results expectedNovember 2026
Study endsNovember 2026
Registry record updatedMay 27, 2026
Trial IDNCT06904625 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Adults (≥18) in France with multi‑metastatic breast or prostate cancer who have not yet started a new line of cancer treatment, have WHO performance status ≤2, and can give informed consent are ideal candidates.

Probably not a fit

Patients already on a new cancer treatment, with only localized disease, with another active solid tumor (except certain in situ cancers), unable to consent, or unable to comply with procedures are unlikely to benefit from participation.

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

What this trial studies

This is a pilot, prospective, single-center study enrolling 36 patients (18 with metastatic breast cancer and 18 with metastatic prostate cancer). Each participant gives blood on one day before initiating a new anti-tumor treatment, and that sample is processed by three different CTC detection techniques: CellSearch®, Parsortix®, and SmartCatch®. The primary aim is to compare the sensitivity of these capture methods for detecting circulating tumor cells. Results will provide comparative data on detection rates across the three platforms in a real-world metastatic setting.

Why it matters

Potential benefit: If successful, the trial could identify the most sensitive blood test for detecting circulating tumor cells, which may improve disease monitoring and help guide treatment decisions.

How similar studies have gone: Related technologies such as CellSearch® and Parsortix® have previously detected circulating tumor cells and shown prognostic value, but direct head-to-head comparisons that include SmartCatch® are limited, so this pilot adds novel comparative data.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

1. Patient with breast cancer (whatever the immunohistochemical subtype: triple-negative, RH+/HER2-negative or HER2-positive) or prostate cancer, multi-metastatic, eligible for a new line of treatment.
2. Patient not yet initiated on a new specific treatment for breast or prostate cancer at inclusion.
3. Age ≥ 18 years and WHO ≤ 2
4. Patient affiliated to Social Security scheme in France.
5. Patient having signed informed consent prior to inclusion in the study and prior to any study-specific procedures.

Exclusion Criteria:

1. Associated pathology(ies) likely to prevent the study procedure from running smoothly
2. Any psychological, family, geographical or sociological condition that prevents compliance with the medical follow-up and/or procedures stipulated in the study protocol.
3. Patient deprived of liberty or under legal protection (guardianship, legal protection)
4. Patient who has had another solid tumor (excluding carcinoma in situ of the breast or cervix) within 5 years.

Where it's running

  • Iuct-O
    Toulouse, France
    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.