MORE IN IGF-1 --- The time line 1979 Scientists discovered IGF-I. 1989 Scientists learned that IGF-I was an identical match in the cow's body and the human body. 1994 FDA encountered the biggest controversy in their history by approving the genetically engineered bovine growth hormone known as BGH (aka BST). When that hormone is injected into cows, levels of IGF-I in milk increase by about 80%. 1998 IGF-I was called the key factor in the growth and proliferation of prostate cancer (Science - January, 1998) and breast cancer (The Lancet - May, 1998). 1999 IGF-I was identified as the key factor in the growth of lung cancer (Journal of the National Cancer Institute - January, 1999). The Journal of the American Dietetic Association (Page 1231) said this about IGF-I levels in people who drink milk: "Serum IGF-I levels (blood levels) increased significantly in the milk group . . . an increase of about 10% above baseline--but was unchanged in the control group."