Shannen Doherty is opening up about a “miracle” treatment she says has given her new hope amid her ongoing battle with stage 4 cancer. During Monday’s episode of her “Let’s Be Clear” podcast, the 52-year-old “Beverly Hills, 90210” star shared she’s experiencing positive results from a new type of infusion “I’m on a new cancer infusion and after four treatments, we didn’t really see a difference and everybody wanted me to switch,” she said in a conversation with her radiation oncologist, Dr. Amin Mirhadi. “I just kinda was like, ‘We’re going to keep going with this and see.’” Thankfully, Dohert…