In reply to Big Ger:
https://www.ncbi.nlm.nih.gov/pubmed/14729019
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4524299/
"According to the measurements of estrogen levels in milk by different studies, it was suggested that estrogen in milk was a possible risk to cause prostate cancer. One reason supporting this hypothesis is that Western diet (characterized by milk/dairy products and meat) causes a trend of increasing levels of estrogens, and Western males show a higher incidence rate of prostate cancer than Asia males. Estrogen levels in prostate fluid are also correlated very well with the prostate cancer."
"During the last couple of years, increasing body of evidence are indicating another property of hormones in dairy products as possible impact on human health including the role of some estrogens and insulin-like growth factor-1 in initiation and provoking of breast, prostate and endometrial tumours."
There are also some articles espousing the opposite result - but, turns out they're authored directly by the dairy industry themselves, and tested mice for 8 days before concluding (I quote more or less) "that it was totally safe, you guys, just chill out and drink it". It's pretty clear this is manufactured dissent, just like we've seen with climate change.