Joan Lunden reveals she has breast cancer

Joan Lunden, co-anchor of

Joan Lunden, co-anchor of "Good Morning America" from 1980 to 1997, revealed her breast cancer diagnosis on the morning show Tuesday, June 24, 2014. She spoke with "GMA" hosts Robin Roberts and Amy Robach, both of whom have also been treated for breast cancer recently. Photo Credit: AP / Charles Sykes

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Joan Lunden, former co-host of "Good Morning America," announced on the program Tuesday that she has been diagnosed with breast cancer, and has begun treatment. Lunden, 63, told Robin Roberts -- who underwent treatment for a bone marrow disorder, myelodysplastic syndrome, that had been related to her cancer -- that an earlier mammogram had been negative, but that a malignancy was later detected by an ultrasound.

"I heard those those words that every woman fears and never wants to hear, 'you have breast cancer,' " she told Roberts, while adding that since then she has "learned everything you can about this and [has gone into] warrior mode." She said the cancer is "of the more aggressive kind" and that treatment will include surgery, chemotherapy and radiation.

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Lunden, a mother of five, including three daughters from her first marriage, also posted in her blog, "I have already begun my chemotherapy and I am blessed to have my husband Jeff [Konigsberg] and my three older daughters with me every step of the way."

An author of eight books -- most on health and healthy lifestyles -- Lunden was co-host of "GMA" from 1980 through 1987. Last November, "GMA" news anchor Amy Robach also announced that she had been diagnosed with breast cancer following an on-air mammogram. A few days later she underwent a bilateral mastectomy.

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