Establishment of Human Lung Cancer Organoids Using Small Biopsy and Surgical Tissues.

Lung cancer is a highly diverse disease, and reliable preclinical models that accurately reflect tumor characteristics are essential for studying lung cancer biology and testing new therapies. This study aimed to establish patient-derived tumor organoids (PDTOs) using small biopsy samples and surgical specimens to create a model system that preserves the genetic and histological features of the original tumors. PDTOs were generated from 163 lung cancer specimens, including 109 samples obtained using endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) or bronchoscopy, 52 surgical specimens, and 2 pleural fluid samples.

Increased risk of lung cancer in individuals with preserved ratio impaired spirometry: a nationwide cohort study.

Accumulating data showed that individuals with preserved ratio impaired spirometry (PRISm) have an increased risk for all-cause mortality and respiratory-related mortality compared with normal spirometry. However, the association between PRISm and lung cancer development is not known. A retrospective cohort study was conducted using the Korean National Health and Nutrition Examination Survey data between 2007 and 2017, which was linked to the Health Insurance Review and Assessment database from 2007 to 2021.

Radial endobronchial ultrasound (EBUS)-guided transbronchial needle aspiration (TBNA) enhances diagnostic yield in pulmonary nodule biopsy.

Background: Diagnosing pulmonary lesions remains challenging despite various modalities. The PeriView Flex aspiration needle offers a promising solution to forceps biopsy limitations. This study aims to assess whether combining radial endobronchial ultrasound (rEBUS)-guided transbronchial needle aspiration (TBNA) and transbronchial lung biopsy (TBLB) may enhance tissue acquisition for inaccessible lesions using forceps.

Treatment Outcomes of Complex Pulmonary Disease with a 2-drug Daily Regimen Using Macrolide and Ethambutol.

Background: Limited data exist on the treatment outcomes of a 2-drug daily regimen of macrolide and ethambutol in patients with complex pulmonary disease (MAC-PD).

Methods: An outcome analysis was performed on 108 patients with MAC-PD who underwent at least 12 months of treatment with macrolides and ethambutol. Microbiological responses, antibiotic resistance rates, and recurrence rates linked to the regimen were analyzed.

Evaluating diagnostic yield and accuracy as key performance metrics in pulmonary lung lesions.

Objective: A conservative definition of diagnostic yields for assessing the performance of guided bronchoscopy has been proposed, but it has yet to be validated in practice.

Methods: Patients who underwent radial endobronchial ultrasound (R-EBUS) between April 2020 and April 2023 were included in the study. Diagnostic results were classified as malignant or non-malignant based on the post-lung-biopsy pathology.

Repeated rebiopsy for detection of EGFR T790M mutation in patients with advanced-stage lung adenocarcinoma: Associated factors and treatment outcomes of Osimertinib.

Objectives: This study was performed to investigate the detection rate of EGFR T790M mutation by repeated rebiopsy, to identify the clinical factors related to repeated rebiopsy, and to assess survival outcomes according to the methods and numbers of repeated rebiopsies in patients with lung adenocarcinoma who received sequential osimertinib after failure of previous 1st or 2nd generation EGFR-tyrosine kinase inhibitors.

Methods: This retrospective study included patients with advanced-stage lung adenocarcinoma who were confirmed to have EGFR T790M mutation and to have received osimertinib from January 2020 to February 2021 at Samsung Medical Center. The presence of T790M mutation was assessed based on either plasma circulating tumor DNA (ctDNA) or tissue specimens.

3D airway geometry analysis of factors in airway navigation failure for lung nodules.

Background: This study aimed to quantitatively reveal contributing factors to airway navigation failure during radial probe endobronchial ultrasound (R-EBUS) by using geometric analysis in a three-dimensional (3D) space and to investigate the clinical feasibility of prediction models for airway navigation failure.

Methods: We retrospectively reviewed patients who underwent R-EBUS between January 2017 and December 2018. Geometric quantification was analyzed using in-house software built with open-source python libraries including the Vascular Modeling Toolkit ( http://www.

Features which discriminate between tuberculosis and haematologic malignancy as the cause of pleural effusions with high adenosine deaminase.

Background: Adenosine deaminase (ADA) is a useful biomarker for the diagnosis of tuberculous pleurisy (TBP). However, pleural effusions with high ADA can also be caused by other diseases, particularly hematologic malignant pleural effusion (hMPE). This study aimed to investigate the features that could differentiate TBP and hMPE in patients with pleural effusion ADA ≥ 40 IU/L.

Clinical Course of Patients With Mediastinal Lymph Node Tuberculosis and Risk Factors for Paradoxical Responses.

Background: Paradoxical responses (PR) occur more frequently in lymph node tuberculosis (LNTB) than in pulmonary tuberculosis and present difficulties in differential diagnosis of drug resistance, new infection, poor patient compliance, and adverse drug reactions. Although diagnosis of mediastinal LNTB has become much easier with the development of endosonography, limited information is available. The aim of this study was to investigate the clinical course of mediastinal LNTB and the risk factors associated with PR.

10-Year Retrospective Review of the Etiologies for Meningitis With Elevated Adenosine Deaminase in Cerebrospinal Fluid: Etiologies Other Than TB.

Purpose: An elevated adenosine deaminase (ADA) level in the cerebrospinal fluid (CSF) is considered a reliable marker of tuberculous meningitis (TBM). However, CSF-ADA levels can also be elevated in other diseases. We aimed to find the most common diagnosis of patients with elevated CSF-ADA levels for the last 10 years.

Comparative Study on the Effect of Cidofovir Treatment for Severe Adenovirus Pneumonia.

Background: Adenovirus infection can cause severe pneumonia even in immunocompetent adults. However, there is limited data on the benefits of cidofovir treatment in severe adenovirus pneumonia. The objective of this study was to evaluate the association of cidofovir treatment with clinical improvement in immunocompetent adult patients with severe adenovirus pneumonia.

Exhaled Nitric Oxide in Patients with Stable Chronic Obstructive Pulmonary Disease: Clinical Implications of the Use of Inhaled Corticosteroids.

Background: Fractional exhaled nitric oxide (FeNO) is regarded as a potential biomarker for identifying eosinophilic inflammation. We aimed to evaluate the clinical implication of FeNO and its influence on inhaled corticosteroids (ICS) prescription rate in Korean chronic obstructive pulmonary disease (COPD) patients.

Methods: FeNO level and its association with clinical features were analyzed.

Inhalation with intravenous loading dose of colistin in critically ill patients with pneumonia caused by carbapenem-resistant gram-negative bacteria.

Background: Despite the increasing use of colistin in clinical practice, the optimal dosing, and administration route have not been established. This study aimed to evaluate the clinical outcome and safety of intravenous (IV) colistin with a loading dose (LD) and adjunctive aerosolized (AS) colistin administration in critically ill patients with hospital-acquired pneumonia (HAP) or ventilator-associated pneumonia (VAP) caused by carbapenem-resistant gram-negative bacteria (CRGNB).

Methods: We retrospectively reviewed 191 critically ill patients who received colistin for the treatment of HAP or VAP caused by CRGNB.

Diagnostic Performance of Radial Probe Endobronchial Ultrasound without a Guide-Sheath and the Feasibility of Molecular Analysis.

Background: Radial probe endobronchial ultrasound (R-EBUS), is effective for tissue diagnosis of lung lesions. We evaluated the diagnostic performance of R-EBUS both a guide-sheath and fluoroscopy and identified factors associated with accurate diagnosis. The feasibility of molecular and genetic testing, using specimens obtained by R-EBUS, was also investigated.

Additional role of bronchial mucosal biopsy for ciliary structural abnormality in diagnosis of primary ciliary dyskinesia.

Background: Transmission electron microscopy (TEM) is one of diagnostic tests for primary ciliary dyskinesia (PCD). The mucosal samples obtained for cilia examination are generally procured from the nasal turbinate, but these specimens often yield inadequate results. The bronchial mucosa is recognized as an alternative sample, but no study has examined the additional utility of bronchial mucosa compared with nasal mucosa in the diagnosis of PCD.

Treatment with a macrolide-containing regimen for Mycobacterium kansasii pulmonary disease.

Background: Mycobacterium kansasii is a major pathogen associated with nontuberculous mycobacterial pulmonary disease. For treatment of M. kansasii pulmonary disease, daily therapy with isoniazid, rifampin, and ethambutol is traditionally recommended.

Unilateral pulmonary artery agenesis manifested by hemoptysis in pregnancy.

Unilateral pulmonary artery agenesis (UPAA) is a rare congenital anomaly which can be symptomatic or even asymptomatic. Most of patients with isolated UPAA have mild symptoms and it is difficult to be diagnosed, especially when abnormal findings of chest radiograph are the first presentation. It is often misdiagnosed and is not considered during differential diagnosis.

A rare case of numerous thoracolithiasis with chest discomfort.

Thoracolithiasis is a rare benign condition with mobile free bodies in the pleural cavity. It is asymptomatic and mostly found incidentally. Up to our knowledge there is no report of symptomatic numerous thoracolithiasis.

Safety of endobronchial ultrasound-guided transbronchial needle aspiration in patients with lung cancer within a year after percutaneous coronary intervention.

Background: Endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) may be necessary for patients with incidental lung cancer during or after coronary intervention. Although EBUS-TBNA is quite safe, the safety in patients who recently received percutaneous coronary intervention (PCI) has not been demonstrated. The aim of this study was to assess the safety of EBUS-TBNA in patients with lung cancer who underwent PCI within one year.

Nontuberculous Mycobacterial Lung Diseases Caused by Mixed Infection with Mycobacterium avium Complex and Mycobacterium abscessus Complex.

complex (MAC) and complex (MABC) comprise the two most important human pathogen groups causing nontuberculous mycobacterial lung disease (NTM-LD). However, there are limited data regarding NTM-LD caused by mixed NTM infections. This study aimed to evaluate the clinical characteristics and treatment outcomes in patients with NTM-LD caused by mixed infection with these two major NTM pathogen groups.