This study was published in Cancer Causes and Control 2013 Mar 16
Study title and authors:
Metabolic factors and breast cancer risk in Korean women.
Noh HM, Song YM, Park JH, Kim BK, Choi YH.
Department of Family Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Irwon-ro 81, Gangnamgu, Seoul, 135-710, South Korea.
This study can be accessed at: http://www.ncbi.nlm.nih.gov/pubmed/23504150
This study evaluated the association between various factors and breast cancer. The study included 270 women with breast cancer and 540 women free from breast cancer.
Regarding high density lipoprotein (HDL) cholesterol levels, the study found that women with HDL cholesterol levels below 1.29 mmol/L (50 mg/dL) had a 10% increased risk of breast cancer compared to women with HDL cholesterol levels above 1.29 mmol/L (50 mg/dL).
The most effective dietary way to raise to raise HDL cholesterol is to consume a diet rich in saturated fat see here, here and here.