October is breast cancer awareness month, and The Office actress took to Instagram to share that she was diagnosed with breast cancer last December.

Jenna had stage 1 triple-positive breast cancer. Doctors caught the disease early, but because it was aggressive, she endured a lengthy treatment period. Jenna had a lumpectomy followed by 12 rounds of weekly chemotherapy and then radiation.

Jenna Fischer has revealed she was diagnosed with breast cancer last year. “The Office” alum — who famously played Pam Beesly on the NBC sitcom — announced the news via Instagram on Tuesday, Oct. 8, in honor of Breast Cancer Awareness month.

However, it doesn’t mean the Dunder Mifflin crew doesn’t pull together like a family when support is most needed. Jenna Fischer, who's known for playing receptionist-turned-saleswoman Pam Beesly, just revealed her breast cancer diagnosis.

Jenna Fischer, the beloved St. Louis-raised actress well-known for her role as Pam on "The Office" TV sitcom, shared a deeply personal health update on Tuesday.

LOS ANGELES — Jenna Fischer, who starred as Pam in nine seasons of "The Office," revealed on social media Tuesday that she is cancer-free after being diagnosed with an aggressive form of breast cancer and undergoing treatment for nearly a year.

The Office star Jenna Fischer has announced she is cancer free after being diagnosed with with breast cancer last December. “Luckily my cancer was caught early and it hadn’t spread to my lymph nodes or throughout the rest of my body,