By Gina Salamone From New York Daily News Christiane Amanpour, CNN’s chief international anchor, revealed that she has ovarian cancer and is now undergoing treatment. The 63-year-old journalist, who had been off the air for about a month to treat the disease, broke the news at the start of her TV show Monday. She called the past four weeks “a bit of a rollercoaster for me.” “I’ve had successful major surgery to remove it, and I’m now undergoing several months of chemotherapy for the very best possible long-term prognosis,” Amanpour said. “And I’m confident. I’m also fortunate to have health insurance through work and incredible doctors who are treating me.” Amanpour, who is based in London, has covered conflicts around the world during her time at CNN. “I’m telling you this in the interest of transparency but in truth, really, mostly as a shoutout to early diagnosis,” Amanpour said Monday. …