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This Feb. 8, 2011 photo, Joan Lunden attends Woman?s Day magazine?s Eight Annual Red Dress Awards in New York. Lunden, the former "Good Morning America" host says she has breast cancer. She revealed her diagnosis on Tuesday, June 24, 2014 on "Good Morning America." She spoke with "GMA" hosts Robin Roberts and Amy Robach, both of whom have also been treated for breast cancer recently.(AP Photo/Charles Sykes)

NEW YORK (AP) — Former "Good Morning America" host Joan Lunden says she has breast cancer.

She disclosed her diagnosis on Tuesday's edition of the ABC morning show, which she co-anchored from 1980 through 1997. She spoke with "GMA" host Robin Roberts, who has also been treated for breast cancer recently, as has "GMA" co-host Amy Robach.

Lunden said her treatment will include surgery and radiation. She said she's already started chemotherapy.

She said after the initial shock of the diagnosis, she resolved to learn everything she can about the illness and go into what she called "warrior mode." She said she expects to make a full recovery.

The 63-year-old Lunden is now a health and wellness advocate. She has written eight books.