A national study analyzing U.S. breast cancer data spanning nearly 50 years has uncovered a major shift in outcomes and risk of developing the disease, highlighting urgent gaps in prevention and treatment for specific groups of women. Analyzing Surveillance, Epidemiology and End Results (SEER) data from 1975—2022, researchers from Houston Methodist found that breast cancer deaths, once concentrated mostly among older women, are increasingly affecting younger women, signaling a major change in the nation's breast cancer risk landscape. While the data showed that survival improved substantially among older women over time, younger women did not experience the same improvement.

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