Sample collection
tumor
TUMOR
Once the lung specimens were harvested, samples of tumor tissue and normal tissue (that was at least 5 cm away from the tumor tissue) were immediately collected. After washing with PBS and drying with filter paper, the specimens, soaked in RNA preservation solution, were placed at −80 °C until use. To ensure that the tumor tissue and the normal tissue were harvested correctly, the lung specimens were verified by an independent pathologist.