With the use of an endoscope, a flexible, tube-shaped instrument, endoscopic mucosal resection (EMR) treats gastrointestinal (GI) cancer and precancerous lesions in a minimally invasive manner. Electrical snares are used to remove these growths - a thin wire that forms a loop at the end that tightens around the tumor. The wire separates the tumor and cauterizes the wound by passing electrical current through it. Gastroenterologists specialize in treating diseases of the gastrointestinal tract, so EMR is performed by them. An endoscope allows the doctor to get a clear view of what is going on inside a patient's body. The procedure can also detect and remove small growths, such as polyps, from the GI tract. If the tumor is in the upper GI tract, the endoscope will be inserted through the mouth and if it is in the lower GI tract, it will be inserted through the anus.