Celebrity | Robin Roberts Joan Lunden: I Have Breast Cancer Former 'GMA' co-host returns to show to reveal diagnosis By Evann Gastaldo Posted Jun 24, 2014 10:11 AM CDT Copied In this Sept. 12, 2008 file photo, Joan Lunden attends the Badgley Mischka 2009 spring collection in Bryant Park during fashion week in New York. (AP Photo/Peter Kramer, file) Joan Lunden returned to Good Morning America today to reveal that she's fighting breast cancer. Lunden, 63, co-hosted the morning show from 1980 to 1997, and she sat down with current co-host Robin Roberts, who's had her own health struggles recently. Lunden said she has "the aggressive kind" of breast cancer, and is already undergoing chemotherapy, but that she's optimistic about her prognosis, People reports. (ABC's Amy Robach was also diagnosed with breast cancer after an on-air GMA mammogram last year.) Read These Next The Wall Street Journal is naming more names tied to Epstein. The White House and South Park are having a tiff. Trump isn't talking about a Ghislaine Maxwell pardon. The first video of an earthquake fault slip led to a major discovery. Report an error