"It was actually my second MRI. It was a follow-up from a biopsy I had had last year," said Applegate.
Applegate says she became very angry when she first got the news.
"I just remember I was just shaking and then also immediately I had to go into take care of business mode which was, you know, I asked them, 'What do I do now? What is it that I do? ... I get a doctor? I get a surgeon? I get an oncologist? What do I do?' So, I immediately made those appointments ... immediately called around for someone to start teaching me how to live macrobiotically," said Applegate.
Applegate made comments about her prognosis to Good Morning America's Robin Roberts, a breast cancer survivor herself.
"I'm clear. Absolutely 100% clear and clean. It did not spread. They got everything out so I'm definitely not going to die from breast cancer," said Applegate.
Robin's interview with Applegate airs Tuesday on Good Morning America.
Applegate is also scheduled to appear on the televised fundraiser "Stand Up To Cancer" on September 5, 2008.