Shannen Doherty's emotional post reveals breast cancer spread to brain.

Actress Shannen Doherty revealed on Instagram that her breast cancer has spread to her brain. Doherty has been battling breast cancer since 2015 and announced a second diagnosis of stage 4 breast cancer in 2020. She received an outpouring of support from friends and fans. Doherty underwent a mastectomy, chemotherapy, and radiation treatment for her cancer.