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,

"She started wearing hats to work so that I wouldn't be the only person in a work meeting wearing a hat," the actress said about her co-star.

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