Extracellular vesicles (EVs) are crucial for facilitating intercellular communication, promoting cell migration, and orchestrating the immune response. Recently, EVs can diagnose and treat tumors. EVs can be measured as biomarkers to provide information about the type of disease and therapeutic efficacy. Furthermore, EVs with lower immunogenicity and better biocompatibility are natural carriers of chemicals and gene drugs. Herein, we review the molecular composition, biogenesis, and separation methods of EVs. We also highlight the important role of EVs from different origins as biomarkers and drug delivery systems in tumor therapy. Finally, we provide deep insights into how EVs play a role in reversing the immunosuppressive microenvironment.

Objective To compare the current therapeutic effects between endovenous radiofrequency treatment and conventional surgery for lower limb chronic venous insufficiency (CVI) ,and summarize operative skills and clinical value of endovenous radiofreq uency treatment on CVI .Methods Data of 45 limbs of 41 patients treated by endovenous radiofrequency treatment (endovenous ra-diofrequencytreatmentgroup)and20limbsof20patientsbytraditionalsurgery(traditionalsurgerygroup)wereanalyzedandcom-pared in terms of operation time ,postoperative pain ,postoperative hospitalized duration ,complications ,and one-year recurrence rate .Results Endovenous radiofrequency treatment group had less postoperative pain and shorter postoperarive hospitalized dura-tion than traditional surgery group(P<0 .05) .The operation time had no significant differences between two groups (P>0 .05) . The two groups had few complications and had no recurrence in one year .Conclusion As a minimally invasive treatment for vari-cose veins ,endovenous radiofrequency treatment has less trauma ,rapid recovery ,safe and effective ,and it is worthy to be recommen-ded .