CA242 is a relatively non-specific tumor marker, if there are some gastrointestinal tumors, especially malignant tumors, this marker will be significantly elevated. CA242 is a relatively nonspecific tumor marker, if there are some gastrointestinal tumors, especially malignant tumors, this marker will be significantly elevated. However, some benign lesions, such as inflammation of the gastrointestinal tract, or patients with dyspepsia, diet and other influences, may also cause this indicator to be slightly higher. Therefore, once this marker is elevated, further CT and endoscopy should be performed to determine whether cancer exists.