Shannen Doherty is living in the moment — and looking forward to the future — amid her battle with stage IV breast cancer.“I’m good,” the Beverly Hills, 90210 alum, 49, told her best friend Sarah Michelle Gellar during a sit-down interview for Entertainment Tonight on Wednesday, October 28. “I love it when people say, ‘We’re praying for you’ … but there comes a point where you go, ‘I got this.’ Like, I’m fine, I’m good.