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In the Women's Health Initiative dietary modification trial, investigators randomized women beginning in 1993 (age range, 50–70) to usual diet or a diet characterized by reduced fat and increased fruit, vegetables, and grains. Results at a median of 8 years indicated that fewer deaths from breast cancer occurred in women assigned to this dietary modification. The current report extends follow-up to a median of 16 years, focusing on the impact of dietary modification on deaths from breast cancer as well as overall mortality in participants with breast cancer diagnoses.
Although most breast cancer characteristics were similar between groups, a significantly smaller proportion of cancers in the dietary modification participants were of the poor…