ctDNA measurement
tumor
TUMOR
A post hoc analysis of circulating tumor DNA (ctDNA) was performed. Baseline and post-infusion venous blood samples were taken from patients using sodium heparin blood tubes and processed for plasma. Plasma samples (1–2.5 ml) were stored at –80 °C until assays were performed. All ctDNA extraction, processing and sequencing from plasma were performed in a CLIA-certified, CAP-accredited laboratory (Guardant Health) as previously described