Treatment mainly consists of surgery in which the entire/part of the stomach is removed along with the Lymphnode which surround the stomach. Then the continuity is re-established with the help of joining the intestine to the food pipe or intestine to the remnant of the stomach.
These operations are now a days very advanced and can be done with minimal access of Laparoscopic surgery and also can be done with the help of Staplers. These staplers are useful in the sense they standardize the suchen and hence prevent complications.
The other treatments in Cancer are Radiation and Chemotherapy which are also given before surgery in some cases to improve the chances of survival Colorectal Cancer is the cancer of large intestine.