Rectal cancer is a disease in which malignant (cancer) cells form in the tissues of the rectum. The rectum is part of the body’s digestive system.The digestive system takes in nutrients (vitamins, minerals, carbohydrates, fats, proteins, and water) from foods and helps pass waste material out of the body.The digestive system is made up of the esophagus, stomach, and the small and large …
https://www.cancer.gov/types/colorectal/patient/rectal-treatment-pdq

