[Research development and controversial topics of function-preserving surgery for early gastric cancer].

With the advancement of the times and technology, the proportion of early gastric cancer has been increasing year by year, and its treatment methods have shifted towards more minimally invasive approaches, with better function-preserving and postoperative quality of life. Function-preserving surgery has gradually become the mainstream surgical option for early gastric cancer. Function-preserving surgeries mainly include segmental gastrectomy, pylorus-preserving gastrectomy, local gastrectomy, and sentinel lymph node navigation surgery. Although significant progress has been made in various function-preserving surgeries in recent years, there are still controversies regarding the selection of surgical indications, assessment of tumor radicality, surgical safety, and postoperative gastric function evaluation. Further high-quality evidence-based research is still needed to confirm the safety and effectiveness of function-preserving surgery for early gastric cancer.