In states where Medicaid was expanded under the Affordable Care Act (ACA), women are more likely to receive breast cancer diagnoses at an early stage, compared with women in other states, new research shows. Among women younger than 50, the average rate of diagnosis at advanced stages lowered from 23% to 21% between 2012-13 (before most states expanded Medicaid) and 2015-16 (after expansion), according to a Yale Cancer Center study published today in JAMA Surgery. In states where Medicaid wasn’t expanded, the average rate of advanced-stage diagnoses stayed constant at 26% during those years. “It’s a small percentage change [in expansion states] but it was statistically significant,” said Dr. Tristen Park, senior author of the study and a breast cancer surgeon at the Yale Cancer Center and Smilow Cancer Hospital, especially since the drop was evident over just a few years. “It’s quite exciting.