Clinical trial NCT06741852: Confocal Laser Endomicroscopy Assisted Endobronchial Ultrasound-guided- Transbronchial Mediastinal Cryobiopsy Via a Tunnel for Diagnosing Mediastinal Lymphadenopathy
Official title: The Diagnostic Yield and Safety of Confocal Laser Endomicroscopy Assisted Endobronchial Ultrasound-guided Mediastinal Cryobiopsy Via a Tunnel for Diagnosing Mediastinal Lymphadenopathy: a Multi-center Randomized Controlled Trial.
Study type: INTERVENTIONAL
Overall status: NOT_YET_RECRUITING
Phase: NA
Conditions: Mediastinal Lymphadenopathy
Lead sponsor: China-Japan Friendship Hospital
Sponsor class: OTHER
First posted: 2024-12-19
Enrollment: 98
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: DIAGNOSTIC

Brief summary: Mediastinal and/or hilar lymphadenopathy (MHL) becoming more and more common in clinical practice with the development of imaging technique. MHL is secondary to various benign and malignant disorders that could be life-threatening conditions due to compression of airways or blood vessels. Accurate and timely diagnosis is important for managing patients with lymphadenopathy. Nowadays, several invasive mediastinal tissue samplings have been designed and development.

For patients with metastatic lymphadenopathy, endobronchial ultrasound (EBUS) guided transbronchial needle aspiration has been recommended as a first-line diagnostic method by several guidelines due to its highly diagnostic sensitivity for non-small cell lung cancer and acceptable safety.However, the relatively limited material retrieved by needle aspiration restricts its diagnostic yield in non-metastatic lymphadenopathy including sarcoidosis, lymphoma, tuberculosis, etc.6,7 It is important to obtain the representative sample which showed the specific pathology for diagnosing patients with non-metastatic lymphadenopathy. Therefore, previous studies attempt to use transbronchial mediastinal cryobiopsy (TBMC) to obtain acquiring samples with sufficient volume suitable for histological and molecular analyses.

Despite several studies have proved that TBMC has a highly diagnostic yield, the heterogeneity of pathologic characteristics in lymph node makes obtaining a representative sample difficult. To overcome the sampling heterogeneity and obtain the possibility of obtaining a representative sample in mediastinal lesions, increasing sampling number had been proved as an effective method in previous studies (5-times TBNA, thrice TBMC). With the increasing sampling number, the potential risk related to the procedure is higher than before.

Needle-based confocal laser endomicroscopy (nCLE) is a laser-based imaging technique that utilizes fluorescence for real-time microscopic imaging at the biopsy needle tip. Compared to EBUS, nCLE enables real-time visualisation of cell shapes, there by acting a real-time microscope. Besides, we had developed a novel procedure which can built a tunnel between airway wall and target lymph node using a puncture dilation catheter and allows various tools to perform procedure, its efficacy and safety had been proved in our published studies.Based on this tunnel, we could perform TBMC under the nCLE guidance. The area with representative pathology of lymph node may be detected by nCLE, and shorten the sampling number. However, it remains unknown which of these techniques is the superior match for needle biopsy.


Eligibility criteria: Inclusion Criteria:

* (1) Age ≥18 years old; (2) Patients with at least one mediastinal and/or hilar lymphadenopathy (short-axis ≥1cm that is detected by chest CT or contrast CT; (3) Patients with recently discovered mediastinal lesions, clinical respiratory symptoms of cough, expectoration, thoracalgia, or complicated lung lesions implicated by thoracic image, which indicates the need of biopsy to identify the etiology; (4) Patients who can understand the purpose of the trial, participate voluntarily and sign an informed consent form.

Exclusion Criteria:

* (1) The lesion is a mediastinal cyst or abscess; (2) Combined severe cardiopulmonary diseases, coagulation disorders, poor tolerance to anaesthesia, combined psychiatric disorders or severe neurosis and other relevant contraindications to bronchoscopy; (3) EBUS assessment reveals that the lesion is rich in blood flow or adjacent to a large vessel, etc. Consider biopsy to be high risk and inappropriate for continuation of biopsy; (4) EBUS did not detect lesions in the hilum and/or mediastinum; (5) Those who, in the judgement of the investigator, have poor patient compliance and are unable to complete the study as required due to mental disorders, etc.

Primary outcomes:
measure: Diagnostic yield
timeFrame: 14 days post-procedure
Secondary outcomes:
Other outcomes:
Locations:
city: Beijing
country: China
facility: China-Japan Friendship Hospital
state: Beijing
Study officials:
References:
citation: Kramer T, Wijsman PC, Kalverda KA, Bonta PI, Annema JT. Advances in bronchoscopic optical coherence tomography and confocal laser endomicroscopy in pulmonary diseases. Curr Opin Pulm Med. 2023 Jan 1;29(1):11-20. doi: 10.1097/MCP.0000000000000929. Epub 2022 Nov 16.
citation: Tournoy TK, Tournoy KG. Digging mediastinal holes with vigour: a word of caution. Eur Respir J. 2021 Dec 31;59(1):2101381. doi: 10.1183/13993003.01381-2021. Print 2022 Jan. No abstract available.
citation: Sun J, Yang H, Teng J, Zhang J, Zhao H, Garfield DH, Han B. Determining factors in diagnosing pulmonary sarcoidosis by endobronchial ultrasound-guided transbronchial needle aspiration. Ann Thorac Surg. 2015 Feb;99(2):441-5. doi: 10.1016/j.athoracsur.2014.09.029. Epub 2014 Dec 12.
citation: Poletti V, Petrarulo S, Piciucchi S, Dubini A, De Grauw AJ, Sultani F, Martinello S, Gonunguntla HK, Ravaglia C. EBUS-guided cryobiopsy in the diagnosis of thoracic disorders. Pulmonology. 2024 Sep-Oct;30(5):459-465. doi: 10.1016/j.pulmoe.2023.11.008. Epub 2024 Jan 5.
citation: Zhang J, Guo JR, Huang ZS, Fu WL, Wu XL, Wu N, Kuebler WM, Herth FJF, Fan Y. Transbronchial mediastinal cryobiopsy in the diagnosis of mediastinal lesions: a randomised trial. Eur Respir J. 2021 Dec 9;58(6):2100055. doi: 10.1183/13993003.00055-2021. Print 2021 Dec.