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The Physicians Committee for Responsible Medicine, in an article for pcrm.org (accessed July 23, 2018) titled "Ask the Expert: Dairy Products," wrote:

“Recent scientific studies have suggested that dairy products may be linked to increased risk for prostate cancer, testicular cancer, and possibly for ovarian and breast cancers…

In Harvard’s Physicians Health Study, including more than 20,000 male physicians, those who consumed more than two dairy servings daily had a 34% higher risk of developing prostate cancer than men who consumed little or no dairy products…

For ovarian cancer, galactose, a component of the milk sugar lactose, has been under study as a possible culprit. A recent analysis of studies examining a relationship between dairy product consumption and ovarian cancer risk found that for every 10 grams of lactose consumed (the amount in one glass of milk), ovarian cancer risk increased by 13 percent.”

July 23, 2018