Actress Shannen Doherty begins new chemotherapy for stage 4 breast cancer spread to brain and bones, amid divorce.

Shannen Doherty shares heartbreaking update on her ongoing battle with stage 4 breast cancer, which has now spread to her brain and bones. The actress, known for her role in Beverly Hills, 90210, began a new "exhausting" chemotherapy treatment. Doherty reveals her uncertainty about the treatment's duration, as well as her emotional struggles amid her divorce from estranged husband Kurt Iswarienko.