In 2015, an estimated 93,000 Americans were diagnosed with colon cancer. Rectal - anal canal cancer ranks 3rd in both men and women. Of these, 39,610 people will be diagnosed with rectal cancer. Especially if you were diagnosed with colorectal cancer before the age of 50, or if there are several other cancers that run in your family, you and your loved ones are at increased risk of familial colorectal cancer. Your loved one needs to be screened earlier than others.