Shannen Doherty, who was diagnosed with breast cancer in March 2015, revealed that she is officially in remission on Friday, April 28, sharing a message of hope on Instagram.

"Moments. They happen. Today was and is a moment. What does remission mean? I heard that word and have no idea how to react. Good news? YES. Overwhelming. YES," the actress wrote.

The Beverly Hills 90210 and Charmed star added that the "next five years" will be critical for her, and that the battle is still not over.

"Now more waiting. As every single one of my fellow cancer family knows, the next five years is crucial. Reoccurrences [sic] happen all the time. Many of you have shared that very story with me," she continued. "So with a heart that is certainly lighter, I wait."

"In the meantime, decisions. Reconstruction which is several surgeries. Decision on taking a pill for the next five years that comes with its own set of problems and side effects. I am blessed, I know that. But for now.... remission. I'm going to just breathe," Doherty concluded.

See her emotionally-charged message below:

TV Co-Stars Who Disliked Each Other Offset: