Robin Roberts by Donna Svennevik/ABC Robin Roberts by Donna Svennevik/ABC
Good Morning America anchor

Robin Roberts announced this morning that she has breast cancer. Prompted by the passing of her close friend

GMA film critic Joel Siegel - who lost his battle with colon cancer on June 29, 2007 - Roberts visited her doctor after discovering a lump during a self-exam and learned she was in the early stages of breast cancer. Roberts will be having surgery shortly and warns viewers that they will "probably notice that I will have my good days and bad days," ABC reports. But an early diagnosis is keeping her positive and urging others to be aware. "I can't stress enough how important it is to get screened and checked for all cancers." Naturally, Roberts is receiving support from both coworkers and fans. "We don't expect her to be out for an extended period of time," GMA spokesperson Bridgette Maney told TVGuide.com. "Robin has been absolutely fantastic. She's been as upbeat as ever. Robin has such a positive outlook. We made the announcement at 7:30 am, and by 9 am, our website had received 1,400 [e-mails]." - Reporting by Megan Cherkezian