Please choose the correct ending to complete the given sentence: Health: [header] How to understand how colon cancer occurs [title] Learn what is colon cancer. [step] Colon cancer, or as it is often called colorectal cancer is a potentially fatal type of cancer due to its metastatic potential. It is a common disease and is a leading cause of death among the elderly people.

Ending1: Before i discuss this disorder it is useful to give an overview about the structure and function of the colon itself. All these in addition to the causes of colon cancer will be discussed here in the context of this article. Ending2: Although it affects one adult male and over one woman, it causes more cancer on either man or woman at a young age. It starts when the pus is removed from the intestinal tract (sometimes known as a colon), and develops within about a year of the age of the woman. Ending3: Colon cancer is particularly common in these individuals who have left their bodies and are not subject to medical treatment. [substeps] A small percentage of americans who have colon cancer are still in their elderly years. Ending4: [substeps] Colorectal cancer significantly affects both adults and children. Studies show that 70% of adults have colon cancer by the time they are 27 or older.

Answer format: ending1/ending2/ending3/ending4