Gastric horn biopsy is a pathological biopsy done by doctors who suspect gastric cancer, or doctors find suspicious lesions in the gastric horn and give routine mucosal biopsies for pathological examination to help clarify whether it is a malignant lesion. The pathological classification of gastric cancer is mainly adenocarcinoma. The location of gastric cancer is the sinus of the stomach, followed by the cardia. In general, when there is an erosion or ulcer, the doctor will routinely take the lesion and send it for pathological biopsy. If the lesion is benign after biopsy, the patient needs to cooperate with the doctor for medication treatment, while if the lesion is malignant, the patient needs to cooperate with the doctor for early surgery, which is the only way to cure the gastric cancer.