I had a gastroscopy and found a tumor under the gastric antrum measuring 0.6 cm. The gastroenterologist just told me to monitor and check once a year. I'm so worried, I don't know what's wrong? Should the tumor under the gastric antrum should be biopsied to know whether it is benign or malignant? Because I'm afraid, I only go to the doctor every 1 year in case the tumor gets bigger and the disease progresses