The gastric morphology is very complex and unique, and the way of approaching and treatment strategies are formulated differently depending on the site of the patient's cancer. One of the main features and strengths of the G-Master is that it can reproduce various parts of the gastric, which was not possible with ESD training using pig excised organs.

Another feature of the G-Master is that it does not use animal organs, so training can be done in an actual endoscopy treatment room, eliminating infection and environmental contamination concerns. Typically, when we use organs from animals, we have to prepare a particular environment, but G-Master allows us to train in an actual treatment room using actual instruments, which is a tremendous advantage for gastroenterologist.

The National Cancer Center Hospital East staff and members spent much time recreating various gastric parts in developing the G-Master. As a result of trial and error, we have created a perfect product that already incorporates ESD treatment strategies of the National Cancer Center Hospital East.

The concept of the newly developed G-Master is reproducibility. The G-Master can reproduce various gastric parts, which was impossible with conventional animal models or non-animal models made of plastic or silicone, making it a good training model for beginners and intermediate users.

Learning ESD requires years of experience, and there are few opportunities to practice, but we believe that the G-Master will increase training opportunities and provide better medical care to patients.

The VTT MUCOSA TYPE used in the G-Master is non-living, making it very hygienic and contamination-free, and it can reproduce various parts of the stomach. Both doctors and patients need to increase the learning curve slope in a limited number of cases. By being able to recreate and practice the part of the patient to be treated beforehand and reviewing the results after the surgery, the learning curve for a single case can be expected to increase significantly. The National Cancer Center Hospital East has a vast number of gastric ESD cases. However, there may be a gap of time in facilities with a small number of cases. We believe that regular training with the G-Master effectively ensures that the acquired skills are not forgotten even when there is no ESD surgery.

There is an impression that we have created a model of what it would be like to have such a product to improve ESD techniques—training with the G-Master before the actual surgery is expected to provide smoother and safer treatment for patients.

Since G-Master is a product that can be used to train gastric ESD at any time and place, we recommend that beginners use it. I hope that people like me, who have some experience in ESD but still have difficulties in some areas, will use it for preoperative simulation and training.