"GMA's" Robin Roberts Has Breast Cancer

ABC "Good Morning America" anchor Robin Roberts has been diagnosed with breast cancer and will be undergoing surgery Friday.

Roberts, 46, told viewers about her cancer on Tuesday morning's show.

"I am so blessed that I found this in the early stages and the prognosis is so promising that my doctor expects me to be flying planes and hanging on to submarines in the middle of the Atlantic and scaling the Mayan pyramids in no time," she said.

Roberts, who is co-anchor of "Good Morning America" with Diane Sawyer, said she examined herself and found a lump on her breast the same day she had done a report on former "GMA" movie critic Joel Siegel, who died of colon cancer last month. The network wouldn't say which breast was affected.

Roberts, who is single, said there is no history in her family of breast cancer.

She's been a contributor to ABC's morning program since 1995 and was the newsreader before being named in May 2005 as one of the show's anchors.

Former ABC news anchor Peter Jennings announced on "World News Tonight" in April 2005 that he had lung cancer. He never appeared on the air again and died four months later.