Shannen Doherty, 50, marked Breast Cancer Awareness Month by giving her fans an in-depth look into her health struggles. The Beverly Hills, 90210 alum was first diagnosed with breast cancer in 2015 and went into remission two years later, only for the actress to announce in Feb. 2020 that the cancer had returned at stage IV. So on Thursday (Oct. 7), Shannen opened up about her cancer journey by sharing two photos to Instagram that were taken during her difficult battle.