Prevention of Gastric Cancer

and dietary changes. Secondary prevention is supported by traditional tumor markers, pepsinogen-based serological biopsy, newer blood-based markers, and major technological progress in endoscopy. High-definition endoscopy, magnification, virtual chromoendoscopy, and artificial intelligence have improved the detection of preneoplastic lesions and early cancer, while advanced therapeutic techniques such as endoscopic mucosal resection and endoscopic submucosal dissection permit organ-sparing treatment. Large projects, including GISTAR, EUROHELICAN, TOGAS, and EUCanScreen, are expected to clarify optimal screening strategies. Although GC incidence has declined, it remains a common and significant malignancy. Understanding the facets of primary and secondary prevention of GC will lead to a reduction in the burden of this disease.