Examining the Formalin Fixation Method for Maintaining High RNA Quality in Surgical Lung Specimens.

Area of Science:

• Oncology
• Molecular Biology
• Pathology

Background:

• Multiplex genetic testing is crucial for nonsmall cell lung cancer treatment.
• Poor RNA quality due to specimen fixation can lead to assay failures.
• Sheet-like fixation is an institutional method to decrease fixation time.

Purpose of the Study:

• To compare RNA quality from lung cancer specimens fixed using sheet-like versus conventional methods.
• To evaluate the impact of fixation methods on multiplex gene-panel testing success rates.

Main Methods:

• Retrospective analysis of 15 sheet-like fixation specimens and 15 conventional fixation specimens from the same resected lungs.
• RNA extraction and quality assessment (DV200, nucleic acid concentration) from all specimens.
• Comparison of multiplex genetic analysis success rates between fixation groups.

Main Results:

• Sheet-like fixation yielded significantly higher DV200 values, indicating less RNA degradation.
• No significant difference in RNA quantity was observed between the methods.
• Multiplex genetic testing success rate was 100% for sheet-like fixation versus 95% for conventional fixation.

Conclusions:

• Sheet-like fixation effectively preserves RNA integrity in lung cancer specimens.
• This method offers superior RNA quality compared to conventional fixation.
• Sheet-like fixation enhances the reliability of molecular testing in lung cancer.