Cohort studies of fat intake and the risk of breast cancer

"We found no evidence of a positive association between total dietary fat intake and the risk of breast cancer. There was no reduction in risk even among women whose energy intake from fat was less than 20 percent of total energy intake. In the context of the Western lifestyle, lowering the total intake of fat in midlife is unlikely to reduce the risk of breast cancer substantially."

Hunter, DJ et. al.
Cohort studies of fat intake and the risk of breast cancer - A pooled analysis. New England Journal of Medicine, 334: (6) FEB 8 1996