Neoplasms

Respiratory Tract (Lung and Bronchial) Diseases

All Conditions

Lung Neoplasms

Multiple Pulmonary Nodules

Respiratory Tract Neoplasms

Thoracic Neoplasms

Lung Diseases

Respiratory Tract Diseases

The bronchovideoscope will be used together with an assisted image-guided bronchoscopic navigation software system called LungPoint®, to view lungs in a real time 3D manner.

Olympus Ultrathin Bronchofibervideoscope (XP260F)

Pyng Lee, MD

The study aims to determine if there are defining EBUS and confocal endoscopy features as well as exhaled alveolar gas VOC that can discriminate malignant pulmonary nodules or masses from benign etiology, thereby obviating unnecessary thoracotomy. Directly sampled alveolar gas VOC from patients with lung cancer will be compared against exhaled breath VOC for signature compounds that may complement CT in screening the population at risk.

AIMS

1. To improve diagnostic yield of pulmonary nodule or mass by using combined approach of navigation bronchoscopy and EBUS.
2. To determine if characteristic features of EBUS and confocal microendoscopy exist as well as VOC patterns in alveolar and exhaled gas that can aid in discriminating malignant pulmonary nodule or mass from benign etiology by correlating with pathology.
3. To identify VOC patterns specific for lung cancer by correlating VOC from directly sampled alveolar gas and exhaled breath with pathology. Exhaled breath VOC signature may complement CT in screening population at risk.

Evaluating the Pulmonary Nodule With Imaging and Biomarkers

National University Hospital, Singapore

The method of analyzing the VOCs was through analyzing the evaporated VOCs from the urine in the container when they evaporated into the sealed chamber. The VOCs in the chamber were then analyzed at the same time by the five different gas semiconductor sensors which were located on the top of the chamber.

the semiconductor metal oxide sensors.

Chatchai Kreepala, M.D.

Volatile organic compounds (VOCs) have grown due to their crucial role in transitioning from invasive to noninvasive cancer diagnostic methods. This study aimed to assess the feasibility of the metal oxide biosensor platform using urine VOCs for detecting genitourinary cancers.

Five different commercially available semiconductor sensors were chosen to detect specific VOCs (methane, iso-butane, hydrogen, ethanol, hydrogen sulfide, ammonia, toluene, butane, propane, trimethylamine, and methyl-mercaptan). Changes in electrical resistance due to temperature variations from the voltage heater were examined to characterize VOC metabolism. Logistic regression and ROC analysis were employed to evaluate potential urine VOCs for genitourinary cancer determination.

Nowadays, the development of semiconductor metal oxide sensors allows the detection of VOCs from breath and urine by relying on the change of voltage and electrical resistance. The studies use electric current to evaporate VOCs and focus on the changes of evaporation at different temperatures. The results from the previous studies have shown that the changes in the voltage and electrical current resistance dynamics in the semiconductor metal oxide sensors indicate specific patterns that are specific to different types of VOCs. Therefore, this could transit the odor-fingerprint in biogas expression platform to the electrical expression platform due to the possibility of specific-disease VOC identification and the cost-effectiveness of the electrical expression platform when compared to SPME and GC-MS.

This is a descriptive cohort study conducted among 64 subjects attending outpatient clinic at during August 2021 to July 2023. All the subjects were advised and voluntarily signed a consent form before participating in our study. The patients with the renal diseases and the normal subjects were prohibited to have strong odor food (such as tea, coffee, onion, garlic, shrimp paste, acacia, fermented fish, pakria, and celery, etc.) for at least 3 hours before the examination of urine VOCs and were prohibited alcohol intakes for more than 24 hours prior to the urine VOCs examination. The urine samples were collected for 20 mL in universal bottles and samples were classified as genitourinary (kidney/bladder/prostate) cancer or non-cancer or normal control after pathological examination of the biopsy specimens. The urine samples were kept at room temperature and taken to be analyzed with the semiconductor sensors within 30 minutes after the samples were collected.

We selected five different commercially available semiconductor metal oxide sensors to detect all the targeted VOCs, which are methane, iso-butane, hydrogen, ethanol, hydrogen sulfide, ammonia, toluene, butane, propane, trimethylamine, methyl-mercaptan (manufactured by Figaro company). These are the types of VOCs which had been studied and were shown to be related to the malignant according to the literature. The detailed products and basic semiconductor circuits are available in the Figaro Product Information Manual (https://www.figarosensor.com/product/sensor/).

The Target Urine VOCs Biosensor for Genitourinary Malignancy Detection

The Urinary Cancer Detection by the Target Urine Volatile Organic Compounds Biosensor

pateints' name and hospital numbers were not indebtifed.

urine VOCs for detecting genitourinary cancers

Study title	NCT ID	Conditions	Interventions	Eligibility	Organization
Evaluating the Pulmonary Nodule With Imaging and Biomarkers	NCT01739881	Lung Cancer	Olympus Ultrath...	21 Years -	National University Hospital, Singapore
The Target Urine VOCs Biosensor for Genitourinary Malignancy Detection	NCT06211010	The Phenomenon ...	the semiconduct...	16 Years -	Suranaree University of Technology
Evaluating the Pulmonary Nodule With Imaging and Biomarkers	NCT01739881	Lung Cancer	Olympus Ultrath...	21 Years -	National University Hospital, Singapore

Spots Global Cancer Trial Database for volatile organic compounds (vocs)