Genotyping of Ebus-tbna Supernant Cell-free Dna in Nsclc

"The interventional pulmonologist selects the most suspect node. The corresponding TBNA is placed in Cytolyt and tagged using a sticker to indicate the specimen from which supernatant must be saved after the initial spin.~The supernatant is transferred to the Laboratoire de Biologie Médicale Oncologique where it undergoes a further hard spin. The remaining supernatant is stored at -80°C before to send it to Foundation One for DNA extraction from 3 ml of supernatant and genotyping.~Two 7,5 mL blood tubes are transferred to the laboratory to extract plasma. Plasma was stored at -80°C and then sent to Foundation One for DNA extraction from 2 mL of plasma and genotyping.~10 slides from the cell block are shipped to Foundation One. These specimens are tested by FoundationOne®CDX (tissue), and FoundationOne®Liquid (supernatant and plasma) for genomic and TMB analyses (hybrid-capture based next generation sequencing)."