This is a middle-aged woman who came to Beijing for medical treatment from abroad. After gastroscopy, she was diagnosed with “gastric horn ulcer” and biopsy indicated “severe heterogeneous hyperplasia”. After appropriate treatment, the patient still had severe abdominal pain and came to our gastroenterology department for a repeat gastroscopy. The gastroscopy confirmed a small ulcer in the corner of the stomach, and we again performed a biopsy. However, unexpectedly, when the examining physician entered the scope to the duodenum, he was surprised to find a peristaltic white cylindrical object in the duodenal bulb, what is it? It turned out to be a roundworm, with the head end still in the descending part of the duodenum and the tail end left in the bulb. Seeing this, chief physician Lin Wu repeatedly tried and finally removed the roundworm with a trap. The patient’s family was happy that the cause of the abdominal pain had been found, so was it over? Pathology soon returned after the examination: there was local cancer in the patient’s gastric ulcer biopsy specimen, and the patient’s gastric angle ulcer was early gastric cancer. A simple case, but with a twist. In fact, the small ulcer in the corner of the stomach was not the cause of the patient’s severe abdominal pain; it was the roundworm that came in and out of the intestine that was the “culprit” for the patient’s two visits. However, it was the abdominal pain caused by this roundworm that prompted the patient to undergo two gastroscopies, and the combined efforts of the endoscopist and pathologist enabled the patient to detect “early gastric cancer” and save her life. Thus, the roundworm was a gift of a different kind from God. Early gastric cancer refers to gastric cancer with lesions limited to the mucosal and submucosal layers, which can be cured through endoscopic or surgical treatment and has a good prognosis compared to progressive gastric cancer. However, the difficulty lies in early diagnosis. Because most patients with early gastric cancer have no symptoms or only have mild non-specific symptoms such as abdominal distension and abdominal discomfort, they are often detected only during health checkups, while patients with wasting, poor appetite and severe abdominal pain often have become progressive stage. Therefore, timely detection of early gastric cancer is the key to save patients’ lives and seize the time for treatment. In recent years, the gastrointestinal endoscopy unit of our department has developed rapidly, and the business volume has been increasing year by year, and the business level has also been greatly improved. Under the advocacy and leadership of Wu Jing and Lin Xiangchun, all endoscopists have maintained great enthusiasm for early cancer screening, not only actively participating in various training courses outside the hospital, but also organizing regular film reading sessions within the department to encourage mutual exchange of experience and constantly urging everyone to stay alert to early cancer. Our hospital is a medical school of oncology affiliated with Capital Medical University under construction, and the gastrointestinal endoscopy room, as an outpost of gastrointestinal tumor diagnosis, is naturally one of the top priorities of daily work, in addition to accurate diagnosis of progressive tumors, screening of early gastric cancer. We believe that our endoscopists will save more lives of gastric cancer patients in their future work through their pursuit of excellence and tireless efforts.