Shannen Doherty said she's getting rid of material things amid her stage four cancer journey. Experts say it can be a good way to cope with a difficult medical diagnosis.Gregg DeGuire/FilmMagicShannen Doherty, who has stage 4 breast cancer, is selling her possessions to fund quality time with her mom.Experts say what Doherty is doing is typical of people facing a serious medical diagnosis.However, they should also plan for things in the future, since their prognosis can improve.Shannen Doherty, the actor best known for her role in "Beverly Hills, 90210," has stage 4 cancer.