The purpose of an endoscopic mucosal procedure is to remove precancerous or early-stage cancerous tissues (lesions) from the digestive tract. Gastrointestinal endoscopic mucosal resection (EMR) is a common form of this procedure. EMR is mostly used for treatment, but it can also be used for collecting tissues for diagnosis. In cases of cancer, EMR can help determine whether the cancer has invaded the tissues beneath the digestive tract lining. A flexible, tube-like tool called an endoscope is used during endoscopic mucosal resection (EMR) to remove gastrointestinal cancers and precancerous lesions. Electrical snares remove these growths using a thin wire that is fed through the endoscope and tightened around the tumor. By passing an electric current through the wire, the tumor is separated and the wound is cauterized. EMR is carried out by a gastroenterologist, or a doctor specializing in GI disorders. It allows the doctor to view the inside of the body in high detail thanks to the endoscope. In addition, it can be useful for spotting and removing small growths in the GI tract, including polyps. An upper GI tumor is inserted through the mouth, while a lower GI tumor is inserted through the anus.