A Prospective Validation Study of Lung Cancer Gene Panel Testing Using Cytological Specimens

Area of Science:

• Oncology
• Molecular Diagnostics
• Genetics

Background:

• Genetic panel testing for lung cancer is crucial for targeted therapy selection.
• Traditional tissue sampling for genetic analysis can be invasive and not always feasible.
• Cytological specimens offer an easier collection method, but their utility for gene panel testing requires validation.

Purpose of the Study:

• To evaluate the diagnostic accuracy of lung cancer gene panel tests using cytological specimens.
• To assess nucleic acid yield and quality from various cytological sample types.
• To compare gene mutation analysis results from cytological samples with those from tissue samples.

Main Methods:

• Prospective enrollment of 163 patients undergoing diagnostic procedures for lung cancer.
• Utilized an amplicon-based, high-sensitivity next-generation sequencing panel for eight druggable genes.
• Evaluated cytological specimens (brushing, needle aspiration, pleural effusion) and compared them with tissue samples.

Main Results:

• 100% nucleic acid extraction and analysis accuracy in adenocarcinoma cases.
• Gene mutations detected in 68.7% of cases with 99.5% concordance to companion diagnostics.
• High correlation (0.711) in gene allele ratio between cytological and tissue samples.

Conclusions:

• High success rate for gene analysis using cytological specimens in lung cancer.
• Sufficient nucleic acid yield and quality from cytology samples support panel analysis.
• Cytological specimens provide reliable gene mutation data comparable to tissue samples.