INTRODUCTION
tumor, death, GCA, malignant tumor, Gastric cardia adenocarcinoma
MALIGNANT TUMOR, TUMOR, GCA, PRIMARY TUMOR
Gastric cardia adenocarcinoma (GCA) is a commonly diagnosed malignant tumor of the digestive tract.The TNM staging system is currently the primary method used to evaluate patient prognosis and guide clinical treatment approaches.The Surveillance, Epidemiology, and End Results (SEER) database covers over 28% of the population of the United States and includes information on patient demographics, stage of diagnosis, treatment process, tumor morphology, primary tumor site, vital status follow‐up, and causes of death, thus providing an effective tool for tumor epidemiological research.