Study protocol
JET
ESD-trained endoscopists who had performed more than 20 ESD procedures participated in the study (In the TDM-621 group, hemostasis was performed using TDM-621, and coagulation hemostasis was performed using hemostatic forceps (Coagrasper, Olympus, Tokyo, Japan) if hemostasis was not achieved within 3 minutes. TDM-621 was administered through a TDM-621 application catheter (FINE JET, Top, Tokyo, Japan) (see Supplementary Video 1, Supplementary Digital Content 6, 