Ovarian cancer, which begins in the female's reproductive organ, is notorious for being a "silent killer." It is often discovered late, when the cancer has reached an advanced state and treatment options are limited.
"When ovarian cancer develops, the cancer has a lot of room to grow within the pelvis. The patient does not feel anything, so the tumor can reach a very large size," says Pei Hui, PhD, MD, director of Gynecological Pathology at Yale Medicine. "It's hard to diagnose early ovarian cancer, which is often undetectable clinically."