Cases of advanced breast cancer among women younger than 40 have tripled in the U.S. over the last three decades, a trend that researchers said has “been increasing at a steady or even accelerating rate.”… according to a study published in the Journal of the American Medical Association….

“This study identifies a trend that hasn’t been described in the past,” said Rebecca Johnson, medical director of the Adolescent and Young Adult oncology program at Seattle Children’s Hospital and the study’s lead author. “We’ll definitely need future studies to figure out why this change is occurring.”