Actress Maura Tierney is ready to be a spokeswoman. As a breast cancer survivor who also happens to be a celebrity, the Hyde Park native has had many opportunities to talk about the disease and her treatment, but she didn’t feel the need to become the face of any movements or organizations until she heard about Amgen’s “Chemotherapy: Myths or Facts” campaign. It appealed to her because when she was diagnosed with the disease in 2009, she didn’t understand how chemotherapy would affect her life. “I was as afraid of the chemo as I was about the cancer,” former “ER” star Tierney (inset) told us last week as she prepared for Monday’s official announcement of the campaign. Tierney, whose family still lives around Boston (“Nobody left,” she told us proudly), said the chemotherapy process was not as bad as she thought it would be. “Everyone’s different,” she acknowledged, but many people don’t understand how chemotherapy has changed over the years and that it’s possible to do what you love while getting the treatment. Tierney, who will announce the campaign on “The View” on Monday morning, will donate money she makes from Amgen to the Jonsson Cancer Center Foundation at UCLA, where she was treated. As for Tierney’s resume, it continues to grow. Earlier this month it was announced that she’ll star opposite Greg Kinnear and Jennifer Westfeldt in “The Power of Duff” at the Powerhouse Theater at Vassar College in July. Tierney said she doesn’t have any acting jobs in the works that will bring her to Boston. She admitted that she hasn’t sought out roles in any of the movies that will film here over the next year. “Maybe I should,” she said.