"I said, 'I want to keep working and I don't want anyone to know at work. At work, I want that to be a space where we go and we laugh and I'm not a cancer patient.'"

For Jenna Fischer, going through breast cancer was a private medical issue that she didn’t want the world to know about until she was ready. That’s where her best friend and Office co-star, Angela Kinsey,

The actress - now cancer-free - discussed undergoing chemo and more in her first big interview since revealing her diagnosis