After watching Dr. Oz discuss colon cancer on The Oprah Show, Sandra, a 57-year-old woman from Phoenix, says she scheduled a colonoscopy.

"[My doctor] asked if I was having any symptoms of any kind, any bleeding from the rectum or change in bowel movements, and I hadn't," she says. "So he asked me, ''Why are you coming to have a colonoscopy?' And I told him, ''Because Dr. Oz said so.'"

During the procedure, doctors discovered that Sandra had colon cancer. "They removed a foot of my colon," she says. "I had no chemotherapy, no radiation because they caught it in the first stages."