Exosome is a small membrane vesicle secreted by most types of cells in vivo or in vitro. Exosomes are found in blood, amniotic fluid, malignant ascites, and mRNAs that are divided into different subgroups due to different secretory tumors. The exoquick TC exosome precipitate reagent of SBI can make the exploration of mRNA biomarkers simple, reliable and quantitative.