It is cancer that starts in the large intestine (colon) or the rectum (end of the colon), developing from the cells lining the colon/rectum. The cancer can cause blockages in the colon, and may cause bleeding (observed in the stools). It is the most common cancer amongst males in Singapore, as well as for both genders combined. Most patients diagnosed with colorectal cancer will die from the disease if not adequately treated. Yet, most of these cases would have been curable if they had been diagnosed early.