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Former 'GMA' host Joan Lunden has breast cancer

Joan Lunden
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On Tuesday former "Good Morning America" co-host Joan Lunden shared she has been diagnosed with breast cancer.

Via Twitter and a letter on her website JoanLunden.com, she said she had received an all-clear two weeks ago after her annual mammogram, but "for women who have dense fibrous breast tissue, as I do, often our doctors will recommend an ultrasound as well."

She wrote, "My ultrasound that day revealed a tumor in my right breast. After a core biopsy was performed, I heard those words that every woman fears and that I never thought I'd hear: 'you have breast cancer.' "

Lunden, who co-hosted "GMA" from 1980 to 1997, said she initially considered keeping the news private, but decided to go public with her story.

"I have decided to talk about my breast cancer because since the moment I took the job at 'Good Morning America' I have lived my life sharing my joys and my disappointments with all of you: my pregnancies, my relationships, my career. I have shared my journey. So it certainly didn't feel right keeping this part of my journey a secret."

Lunden shared her news with Robin Roberts, GMA co-host and breast cancer survivor. GMA co-host Amy Robach is currently being treated for breast cancer.

Lunden told Roberts that the form of cancer she has is particularly aggressive and is currently undergoing chemotherapy.

According to Breastcancer.org about 1 in 8 U.S. women (just under 12%) will develop invasive breast cancer over the course of her lifetime