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J. Dorca
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MA 20 - Recent Advances in Pulmonology/Endoscopy (ID 685)
- Event: WCLC 2017
- Type: Mini Oral
- Track: Pulmonology/Endoscopy
- Presentations: 2
- Moderators:C. Lee, S. Sasada
- Coordinates: 10/18/2017, 14:30 - 16:15, F205 + F206 (Annex Hall)
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MA 20.06 - Discerning Lung Cancer Cell Patterns with Confocal Endomicroscopy (ID 8640)
15:05 - 15:10 | Author(s): J. Dorca
- Abstract
- Presentation
Background:
Probe-based confocal endomicroscopy (pCLE) allows confocal microscopy of lung tissue in vivo but limited evidence is available. The objective was to discriminate pCLE patterns of lung cancer in vivo.
Method:
Fluorescence properties of methylene blue (MB) were examined ex vivo in confocal microscope. Next, 15 regions of the central airways were studied in vivo with pCLE and a representative image chosen for analysis with ImageJ software. Biopsy was performed for final diagnosis.
Result:
Ex vivo study showed no differences between 1% and 2% MB concentrations and rapid extinction of fluorescence after 10 minutes of MB application (figure). In vivo study included samples of bronchial mucosa (n = 6), inflammation (n = 3) and tumor (n = 6). pCLE image evaluation (table) showed inflammation and tumor nuclei were bigger (except SCLC) and occupied a greater area. Fluorescence of tumor nuclei was more intense. Non fluorescent area was inferior for both inflammation and tumor samples. Number of nuclei could not discriminate between normal and tumor.Figure 1 Table. Imaging features evaluated in pCLE framesArea occupied by nuclei (µm[2]) Intensity of nuclei (UA) Mean size of nuclei (µm[2]) Non-fluorescent area (µm[2]) Number of nuclei (µm[2]) Bronchial epithelium (mean(SD)) 97,769(9,451) 126(9) 107(10) 67,100(12,567) 937(84) Inflammation (mean(SD)) 117,381(22,166) 122(27) 127(15) 35,124(32,630) 933(225) B cell lymphoma 138,354 145 185 49,269 746 Adenocarcinoma 155,033 198 177 5,225 875 Squamous cell carcinoma 102,805 145 155 54,301 663 Small cell lung cancer 107,201 157 63 11,257 1,687 Non-small cell lung cancer 113,173 187 122 32,359 926 Hamartoma 120,188 145 114 25,438 1,058
Conclusion:
1. MB fluorescence is unaffected by stain concentration 2. There is exponential extinction of MB over time 3. Lung cancer cell pattern distinction in vivo is feasible Funded by Fundació MaratóTV3, SEPAR and FUCAP
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MA 20.08 - Classification of Confocal Endomicroscopy Patterns for Diagnosis of Lung Cancer (ID 9874)
15:15 - 15:20 | Author(s): J. Dorca
- Abstract
- Presentation
Background:
Solitary pulmonary nodules diagnosis and management is so challenging that nNew endoscopic techniques are being introduced to reduce uncertainty in peripheral pulmonary lesions (PPL) diagnosis and management. increase its diagnostic yield. Probe-based confocal laser endomicroscopy (pCLE) is a technique that can microscopically image the lung tissue in vivo during flexible bronchoscopy, though it can be difficult for pulmonologists to distinguish cellular patterns in a monochrome vision under respiratory and cardiac movements. . The goal of this work is to explore explore if Computed-Aided Diagnoses (CAD) tools can obtain a reliable diagnoses with pCLE in lung cancer.
Method:
A pilot study using 2 different methods for pCLE pattern analysis was performed:, one based on visual analysis by 3 experts and the other one based on computeron computerized analysis of visual patterns called Graphcom. Twelve 12 pCLE videos ( obtainedobtained using mMethylene blue dye (1%) and Alveloflex-Cellvizio 660nm miniprobe) were selected from patients with endobronchial lesionsperipheral SPNs (6 with lung adenocarcinoma cancer and 6 with inflammatory disease) during rigid bronchoscopy under general anesthesia. Afterwards, Vvideo sequences from pCLE were visually explored by one of the authors to select between 10 and 15 framesimages that presented a clear cellular pattern, without artifacts. . These images were shown to 3 observers who were familiar with confocal images but ignored the final histopathological diagnosis for a blind visual labellinglabeling. Images were also computationally analyzed using methods from social networks community analysis in a graph representation of pCLE images based on visual features to potentially overlapping groups of images that share common visual properties.
Result:
Our preliminary results indicate that on average visual analysis with 3 independent experts can only achieve a 60.2% of accuracy and has large variability amongst observers, while the accuracy of the proposed unsupervised image pattern classification rai(GraphCom) sesrises to 83,4.4%.
Conclusion:
Visual inspection of CLE images from lung tissue fails to provide accurate diagnosis. CLE images contain enough visual information for in vivo detection of neoplastic cell patterns that could be discriminated using cComputation methods and graph structural analysis applied to deep-learning feature spaces can increase diagnostic accuracy of pCLE images against visual analysis (83.4% vs 60.2%). Future studies are needed to apply this method in a real time scenario during bronchoscopy for PPL diagnoses.
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P1.12 - Pulmonology/Endoscopy (ID 698)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Pulmonology/Endoscopy
- Presentations: 1
- Moderators:
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
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P1.12-009 - Experience with Fully Covered Metallic Stents in Patients with Malignant Airway Obstruction (ID 10273)
09:30 - 09:30 | Author(s): J. Dorca
- Abstract
Background:
Airway stenting provides a solution to restore patency of the airways in patients with malignant conditions that are unsuitable for surgical procedures. Their use has been associated with significant improvement in symptoms and quality of life. There is little experience with recent commercially available fully covered metallic stents.
Method:
All patients who underwent fully silicon covered nitinol mono-filament Aerstent® (Leufen, Bess, Germany) placement at the Hospital Universitari de Bellvitge from September 2013 and February 2017 were retrospectively reviewed for medical records, bronchoscopy and microbiological results, as well as stent related complications and patient survival.
Result:
66 stents were implanted in 54 patients during this 36 months period, with mean age of 59 years (43-81 years). The main indication of stent placement was lung cancer in 41 (76%) patients (22 squamous, 9 adenocarcinoma, 5 undetermined NSCLC, 4 small-cell lung cancer and 1 atypical carcinoid). Stents were deployed with rigid bronchoscopy under fluoroscopic control in main bronchus (n=42), trachea (n=7), and main carina (Y shape n=17). Photocoagulation with YAP laser and/or mechanical debulking was necessary in 44 (66.6%) procedures prior to stenting. Seven stents (10.6%) required repositioning after deployment using rigid grasping forceps. Major bleeding occurred in 12 procedures (18.1%) and was successfully managed with endoscopic methods. No immediate complications occurred after the procedures. In 52 cases (96.3%) immediate and significative clinical improvement in dyspnoea was registered. Median survival after first stent deployment was 144 days (6-484). 7 patients died within 30 days after the procedure. 50 patients (92%) had stent related complications during follow up (table 1).Table 1. Rate and time to complications
Patients (n= 54) Time (mean) in days to detection Mucostasis 42 (77%) 28.2 Colonization 22 (40.1%) 47.1 Granulation tissue 20 (27%) 48.8 Migration 7 (13%) 18.7 Silicon detachment 12 (22.2%) 84.5
Conclusion:
In our case series, Aerstent (Leufen, Bess) has provided immediate dyspnoea relief in 96.3% of patients, without significative complications during deployment or within the first 24 hours. Mucostasis is the most common complication (77%) and is detected during the first month (mean 28.2 days).
