In 2015, it is estimated that 93,090 Americans will be diagnosed with colon cancer. Colorectal cancer is the third most commonly diagnosed cancer in men and women. Of those, 39,610 will be diagnosed with rectal cancer. In addition, about 7,270 people will learn they have anal cancer. Patients with these types of cancers often benefit from radiation therapy as part of treatment. Some cancers involving the bowel run within families (hereditary colorectal cancers). It is important to discuss your diagnosis with family members so they can decide with their doctors whether they need to be screened for colorectal cancers. This is especially important if you were diagnosed with a colorectal cancer before age 50 or if there are several other types of cancers that run in your family.