Fig. 2From: Targeted sequencing of circulating cell-free DNA in stage II-III resectable oesophageal squamous cell carcinoma patientsCell-free DNA yield in pre- and post-surgery blood samples. DNA yields were calculated per millilitre of blood. Sixteen pairs of cfDNA samples were included as one of the two insufficient pre-cfDNA samples information is not available. The amount of plasma cfDNA isolated before surgery was lower than the amount obtained after surgery (p = 0.015) based on Mann-Whitney-Wilcoxon rank sum testBack to article page