“Ovarian cancer is the most feared gynecologic cancer,” says Teresa Diaz-Montes, MD, associate director of the Lya Segall Ovarian Cancer Institute at Mercy Medical Center in Baltimore, MD. Perhaps that’s for good reason: Often called the “silent killer,” the disease has symptoms that can be vague and there’s no reliable screening test, which is why the fatality rate is so high. “The majority of women diagnosed with ovarian cancer present with advanced-stage disease,” says Diaz-Montes. “For these women, survival is less than 30% at 5 years.”But the news isn’t all bad. When caught early—as about 20% of cases are—ovarian cancer is highly treatable, and the 5-year survival rate is 94%. Here’s what you need to know about reducing your risk and spotting the warning signs quickly if they should strike.