Another reason why I don’t drink ze leche
Why is that a problem? A report by the European Commission’s authoritative international 16-member scientific committee not only confirmed that excessive levels of IGF-1 are always found in the milk of cows injected with BGH. It also concluded that excess levels of IGF-1 pose serious risks of breast, colon and prostate cancer.

http://www.huffingtonpost.com/john-robbins/female-infants-growing-br_b_676402.html
(John Robbins, Diet for A New America author: Female Infants Growing Breasts - Another Disaster from Hormones in Milk Production)