Can a simple blood test catch lung cancer earlier in smokers with COPD?
NCT ID NCT02500693
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether a blood test for circulating tumor cells (CTCs) can help detect lung cancer earlier in people at very high risk: smokers and ex-smokers with COPD. Researchers combined this blood test with low-dose CT scans over three yearly screenings in 683 participants. The goal was to see if CTCs could reduce false positives and catch cancers that CT scans might miss.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Isolation of circulating tumor cells (CTC) from blood
- What this could lead to
- If successful, this approach could improve early lung cancer detection in high-risk COPD patients, reducing false positives and missed cancers from CT scans alone.
- What could go wrong
- This is a completed observational study, not a treatment trial. The CTC test may not prove reliable enough for routine screening, and results may not apply to broader populations.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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683 people
The number who actually took part.
- Started
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Oct 2015
- Finished
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Oct 2020
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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55 years and older
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Age 55 years or more * 30 or more pack-years of cigarette smoking history * Former smokers: quit smoking within the previous 15 years * Signed informed consent form * Presence of COPD * Affiliation to the French social security system Exclusion Criteria: * Chest CT examination in the 12 months prior to eligibility assessment(1) * Treatment for, or evidence of, any cancer other than skin basocellular carcinoma in the 5 years prior to eligibility assessment * Pneumonia or acute respiratory infection treated with antibiotics in the 12 weeks prior to eligibility assessment * Unexplained weight loss of more than 15 10%pounds in the 12 months prior to eligibility assessment * Recent hemoptysis * History of lung volume reduction with coils, glue or valves° * Metallic implants or devices in the chest or back, such as pacemakers or Harrington fixation rods * Participation in another cancer screening trial * Participation in a cancer prevention study, other than a smoking cessation study * Vulnerable persons: adults under guardianship, adults under trusteeship or persons deprived of their liberty, patients under 18 years old * Medical and/or psychiatric problems of sufficient severity to limit full compliance with the study or expose patients to undue risk 1. Many COPD patients will have had a previous chest CT examination. This has become common in medical practice, especially in patients with chronic lung diseases such as COPD patients. Including such patients would introduce huge bias in the study by artificially focusing on rapidly growing cancers. Redoing a CT in a screening intend in a patient who recently underwent this investigation would also unnecessarily enhance irradiation in these patients. It should be note that in the NLST trial "previous chest CT (≤ 18 months)" was a key exclusion criterion \[NLST Radiology 2011\].
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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CH de Roubaix
Roubaix, France
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CHRU de Lille
Lille, France
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CHU d'Amiens
Amiens, France
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CHU de Dijon
Dijon, France
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CHU de Grenoble
Grenoble, France
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CHU de Montpellier
Montpellier, France
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CHU de Nancy
Nancy, France
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CHU de Reims
Reims, France
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CHU de Rennes
Rennes, France
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CHU de Rouen
Rouen, France
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CHU de Saint Etienne
Saint-Etienne, France
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CHU de Strasbourg
Strasbourg, France
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CHU de Toulouse
Toulouse, France
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CHU de Tours
Tours, France
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Hospices Civils de Lyon
Lyon, France
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Hôpital Bichat
Paris, France
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Hôpital Cochin
Paris, France
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Hôpital Européen Georges Pompidou
Paris, France
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Hôpital Nord
Marseille, France
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Hôpital TENON
Paris, France
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