Lung Cancer
Conditions
Keywords
breathomic, NSCLC, screening, volatile organic compounds
Brief summary
Breath analysis examining specific patterns of volatile organic compounds (VOCs) has been demonstrated to be able to discriminate lung cancer (LC) patients from healthy controls (HC). However, the existing technology uses complex, expensive, and low throughput analytical platforms to give an offline response, thus preventing its applicability for mass screening. The reliability of a new portable device to enable rapid, on-site LC diagnosis is tested.
Detailed description
The breath of patients with histologically proven NSCLC and healthy controls was sampled into Tedlar bags through a Nafion filter and a one-way mouthpiece. The breath samples in the bags were then analyzed by an automated micro portable gas chromatography device developed in-house, which consisted of a thermal desorption tube, thermal injector, separation column, and photoionization detector, as well as other accessories such as pumps, valves, and a helium cartridge. The chromatograms were analyzed by chemometrics and machine learning techniques.
Interventions
DEVICEPortable GC device for brath analysis
Patients were asked to orally exhale 1-2 L breath into a 5 L Tedlar bag via a one-way mouthpiece and Nafion filter for moisture removal, as shown in Figure 1B. The process usually takes about a few minutes. The breath analysis took place either in-situ immediately after the breath sample collection or within 24 h of breath collection. The Tedlar bags were stored under ambient condition until analyzed. During the breath analysis, the Tedlar bag was connected to the sampling port of the portable GC (Figure 1C). Approximately 350 mL of breath was pulled from the Tedlar bag into the GC for analysis. The GC operation was controlled using LabView via a laptop. The total assay time was 30 min, including 5 min of breath sampling time from the Tedlar bag at a flow rate of 70 mL/min (see the blue path in Figure 1A), 5 min of desorption/transfer time, 10 min of chromatographic separation time (see the orange path in Figure 1A), and 10 min of GC system cleaning time.
Sponsors
University of Michigan
Humanitas Hospital, Italy
Azienda Ospedaliero-Universitaria Consorziale Policlinico di Bari
Study design
Observational model
CASE_CONTROL
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No
Inclusion criteria
* NSCLC histologically proven (for LC group) at any stage of disease * non-cancer controls who had negative findings on preoperative chest X-rays/chest CT scan (for HC groups)
Exclusion criteria
* Patients who had any history of another type of cancer * who had received neoadjuvant chemo/radiotherapy because of the possible unknown effects on cancer metabolism * pediatric patients.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Changes in VOCs peaks in patients with lung cancer vs healthy patients | 24 hours | Identify biomarkers able to discriminate between lung cancer patients and healthy controls. |
Countries
Italy
Outcome results
None listed